Enhanced electrochromic properties of WO3/ITO nanocomposite smart windows
作者：
An, Feng Hui;Yuan, Yu Zheng;Liu, Jian Qiang* ;He, Meng Dong;Zhang, Bo
期刊：
RSC Advances ,2023年13(19):13177-13182 ISSN：2046-2069
通讯作者：
Liu, Jian Qiang
作者机构：
[An, Feng Hui] Jiujiang Univ, Jiangxi Prov Engn Res Ctr Mat Surface Remfg, Jiujiang 332005, Jiangxi, Peoples R China.;[Yuan, Yu Zheng; He, Meng Dong] Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Peoples R China.;[Liu, Jian Qiang] Jiujiang Univ, Coll Sci, Jiujiang 332005, Jiangxi, Peoples R China.;[Zhang, Bo] Jiangxi Univ Sci & Technol, Energy Mat Comp Ctr, Sch Energy & Mech Engn, Nanchang, Peoples R China.
通讯机构：
[Liu, Jian Qiang] C;College of Science, Jiujiang University Jiujiang Jiangxi 332005 China
摘要：
Tungsten oxide is regarded as the most promising electrochromic material owing to its continuously tunable optical properties, low cost, and high coloration efficiency. Further improving its optical modulation, switching speed, and coloration efficiency is important to electrochromic smart windows and related devices. Here, we demonstrate an enhanced electrochromic film composed of a WO(3) nanosheet and ITO nanoparticles developed by an all-solution technology. The WO(3) nanosheet is fabricated by an acid-assisted hydrothermal process with high product efficiency. The introduction of an ITO into the WO(3) nanosheets significantly improved the electrochemical activity and the conductivity of the composite film. Compared with a reported electrochromic film without ITO doping, our synthesized composite WO(3) film exhibited optical modulation up to 88% and a high coloration efficiency of 154.16 cm(2) C(-1). Particularly, our electrochromic film was based on the dispersant solution and spin-coating technology, which may also be realized with nano-spray coating for large scale applications. The results offer an effective way to develop large-area electrochromic film and devices.
语种：
英文
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Enhanced third-harmonic generation from layered graphene/insulator disks array
作者：
Liu, Jian-Qiang* ;Fang, Jiang-Nan;Wang, Dian Yuan;Chen, San;He, Meng-Dong
期刊：
Journal of Physics D: Applied Physics ,2021年54(5):055302 ISSN：0022-3727
通讯作者：
Liu, Jian-Qiang
作者机构：
[Liu, Jian-Qiang; Wang, Dian Yuan] Jiujiang Univ, Sch Sci, Jiujiang 332005, Peoples R China.;[Fang, Jiang-Nan] Jiujiang Univ, Sch Tourism & Geog, Jiujiang 332005, Peoples R China.;[Chen, San] Huaibei Normal Univ, Sch Phys & Elect Informat, Huaibei 235000, Anhui, Peoples R China.;[He, Meng-Dong] Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha, Peoples R China.
通讯机构：
[Liu, Jian-Qiang] J;Jiujiang Univ, Sch Sci, Jiujiang 332005, Peoples R China.
关键词：
Graphene;Harmonic analysis;Optical communication;Optical frequency conversion;Plasmonics;Anti-bonding state;Appropriate designs;Effective mechanisms;Geometry parameter;Harmonic frequency conversion;Non-linear response;Plasmonic coupling;Traditional materials;Harmonic generation
摘要：
The non-linear responses of optical materials offer useful mechanisms for optical switching, novel optical sources, and harmonic frequency conversion. However, the non-linear response of traditional materials is usually extremely weak and requires high input power for excitation. In this study, we theoretically propose a scheme for enhancing the third harmonic generation (THG) efficiency and output power of layered graphene disks array by introducing a plasmonic antibonding state with enhanced oscillation strength due to plasmonic coupling. We verify that, the THG efficiency of a double-layer stacked graphene/SiO2 disk structure under relatively low input intensity can be significantly enhanced more than one order of magnitude with appropriate design, as compared with monolayer patterned graphene nanostructure. We also demonstrate that the THG efficiency can be further improved by optimizing the geometry parameters such as spacer distance and Fermi energy. Our results offer an effective mechanism for significantly improving THG efficiency in the mid-infrared and terahertz ranges, thereby paving the way for new frequency converters and modulators in optical communication and signal processing. © 2020 IOP Publishing Ltd.
语种：
英文
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High Bipolar Conductivity and Robust In-Plane Spontaneous Electric Polarization in Selenene
作者：
Wang, Dan;Tang, Li-Ming* ;Jiang, Xing-Xing;Tan, Jie-Yao;He, Meng-Dong;...
期刊：
Advanced Electronic Materials ,2019年5(2):1800475- ISSN：2199-160X
通讯作者：
Tang, Li-Ming
作者机构：
[Wang, Dan; Wang, Xin-Jun; He, Meng-Dong] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Hunan, Peoples R China.;[Tan, Jie-Yao; Jiang, Xing-Xing; Tang, Li-Ming; Chen, Ke-Qiu] Hunan Univ, Sch Phys & Elect, Dept Appl Phys, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[Tang, Li-Ming] H;Hunan Univ, Sch Phys & Elect, Dept Appl Phys, Changsha 410082, Hunan, Peoples R China.
关键词：
atomic thickness ferroelectricity;selenene;2D elemental ferroelectricity
摘要：
Selenene has been predicted as a new member of an atomically thin 2D crystalline material family as of last year. With first principle calculations, two different stable phases of selenene, one with the 1T-MoS2-like structure (α-Se) and the other with alternating arrangement structure of deformed four-membered and six-membered rings (b-Se) are identified. Further research indicates that monolayer α-Se exhibits excellent bipolar conductivity, possessing rather high hole mobility close to that of graphene, and monolayer b-Se shows a robust in-plane spontaneous electric polarization of 13.46 mC cm−2 and a polarization reversing barrier of 422 meV per unit cell. The findings offer a promising material for high speed electronic devices and broaden the family of 2D ferroelectric materials, especially the family of elemental ferroelectric materials. © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
语种：
英文
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A sensitive biosensor based on optical bistability in a semiconductor quantum dot-DNA nanohybrid
作者：
Li, Jian-Bo* ;Liang, Shan;Xiao, Si;He, Meng-Dong;Liu, Ling-Hong;...
期刊：
Journal of Physics D: Applied Physics ,2019年52(3):035401 ISSN：0022-3727
通讯作者：
Li, Jian-Bo
作者机构：
[Luo, Jian-Hua; Liu, Ling-Hong; He, Meng-Dong; Chen, Li-Qun; Li, Jian-Bo] Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Hunan, Peoples R China.;[Liang, Shan] Hunan Normal Univ, Dept Phys, Changsha 410081, Hunan, Peoples R China.;[Xiao, Si] Cent S Univ, Sch Phys & Elect, Hunan Key Lab Super Microstruct & Ultrafast Proc, Changsha 410083, Hunan, Peoples R China.
通讯机构：
[Li, Jian-Bo] C;Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Hunan, Peoples R China.
关键词：
Biosensors;Couplings;DNA;Field plotting;Nanocrystals;Nanostructured materials;Optical bistability;Optical switches;Coupling strengths;DNA concentration;DNA molecules;Excitation conditions;Exciton resonances;Nano hybrids;Parameter spaces;Pumping intensity;Semiconductor quantum dots
摘要：
We propose a scheme of a sensitive biosensor based on optical bistability (OB) in a biological semiconductor quantum dot (SQD)-DNA coupled nanohybrid. By plotting bistability phase diagrams within the system's parameter space, we show that the bistable effect can be switched on or off by only tuning the pumping intensity or the detuning of the pump field from the exciton resonance. Simultaneously, we reveal that the bistability only exists in the strong SQD-DNA coupling regime. Specifically, we derive the matching relation between the excitation conditions and the coupling strength when the bistability just appears. Moreover, we demonstrate that the OB is highly sensitive to the SQD-DNA coupling strength which is strongly correlated to the length of DNA molecules and DNA concentration. This investigation may be useful for opening a new way to build optical switches and providing a novel and convenient platform to detect DNA molecules. © 2018 IOP Publishing Ltd.
语种：
英文
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Electromagnetic near-field coupling induced polarization conversion and asymmetric transmission in plasmonic metasurfaces
作者：
Peng, Yu-Xiang;Wang, Kai-Jun;He, Meng-Dong* ;Luo, Jian-Hua;Zhang, Xin-Min;...
期刊：
Optics Communications ,2018年412:1-6 ISSN：0030-4018
通讯作者：
He, Meng-Dong
作者机构：
[Zhang, Xin-Min; Peng, Yu-Xiang; Luo, Jian-Hua; Wang, Kai-Jun; Tan, Shi-Hua; He, Meng-Dong; Li, Jian-Bo] Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410018, Hunan, Peoples R China.;[Chen, Xiaoshuang; He, Meng-Dong; Hu, Wei-Da] Chinese Acad Sci, Natl Lab Infrared Phys, Shanghai 200083, Peoples R China.;[Liu, Jian-Qiang] Jiujiang Univ, Coll Sci, Jiujiang 332005, Peoples R China.
通讯机构：
[He, Meng-Dong] C;Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410018, Hunan, Peoples R China.;Chinese Acad Sci, Natl Lab Infrared Phys, Shanghai 200083, Peoples R China.
关键词：
Excited states;Light polarization;Light transmission;Plasmons;Polarization;Asymmetric transmissions;Circularly polarized light;Electromagnetic near fields;Induced polarization;Linearly polarized light;Metasurface;Plasmon modes;Polarization conversion;Ring gages
摘要：
In this paper, we demonstrate the effect of polarization conversion in a plasmonic metasurface structure, in which each unit cell consists of a metal bar and four metal split-ring resonators (SRRs). Such effect is attributed to the fact that the dark plasmon mode of SRRs (bar), which radiates cross-polarized component, is induced by the bright plasmon mode of bar (SRRs) due to the electromagnetic near-field coupling between bar and SRRs. We find that there are two ways to achieve a large cross-polarized component in our proposed metasurface structure. The first way is realized when the dark plasmon mode of bar (SRRs) is in resonance, while at this time the bright plasmon mode of SRRs (bar) is not at resonant state. The second way is realized when the bright plasmon mode of SRRs (bar) is resonantly excited, while the dark plasmon mode of bar (SRRs) is at nonresonant state. It is also found that the linearly polarized light can be rotated by 56.50 after propagation through the metasurface structure. Furthermore, our proposed metasurface structure exhibits an asymmetric transmission for circularly polarized light. Our findings take a further step in developing integrated metasurface-based photonics devices for polarization manipulation and modulation. © 2017 Elsevier B.V.
语种：
英文
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Giant faraday rotation in graphene metamolecules due to plasmonic coupling
作者：
Liu, Jian Qiang* ;Wu, Shan;Zhou, Yu Xiu;He, Meng Dong;Zayats, Anatoly, V
期刊：
Journal of Lightwave Technology ,2018年36(13):2606-2610 ISSN：0733-8724
通讯作者：
Liu, Jian Qiang
作者机构：
[Liu, Jian Qiang; Zhou, Yu Xiu] Jiujiang Univ, Sch Sci, Jiujiang 332005, Peoples R China.;[Liu, Jian Qiang; Zhou, Yu Xiu] Jiujiang Univ, Key Lab Jiangxi Microstruct Funct Mat, Jiujiang 332005, Peoples R China.;[Wu, Shan] Fuyang Normal Univ, Lab Funct Mat & Devices Informat, Fuyang 236032, Peoples R China.;[He, Meng Dong] Cent South Univ Forestry & Technol, Sch Sci, Changsha 410004, Hunan, Peoples R China.;[Zayats, Anatoly, V] Kings Coll London, Dept Phys, London WC2R 2LS, England.
通讯机构：
[Liu, Jian Qiang] J;Jiujiang Univ, Sch Sci, Jiujiang 332005, Peoples R China.;Jiujiang Univ, Key Lab Jiangxi Microstruct Funct Mat, Jiujiang 332005, Peoples R China.
关键词：
Light polarization;Magnetic fields;Metamaterials;Nanophotonics;Optical devices;Plasmonics;Polarization;Rotation;Terahertz waves;External magnetic field;Faraday rotation angle;Multi-layered graphene;Nanophotonic devices;Operation wavelength;Polarization rotation;Polarization rotator;Static magnetic fields;Graphene
摘要：
We designed and numerically investigated a mechanism to enhance the polarization rotation when THz radiation passes through an array of multilayered graphene/insulator disks placed in a static magnetic field. The observed giant Faraday rotation is due to plasmonic coupling in the disks leading to the enhanced dipole oscillation strength of plasmonic antibonding states. With additional electromagnetic coupling between the disks in the array, the Faraday rotation angles nearly 30° are achieved in a relatively small external magnetic field of around 1 T. The operation wavelength can be tuned within the THz spectral range by controlling the Fermi level of graphene, number of graphene layers, and disk size and period. The proposed mechanism opens up a way to design the ultrathin magneto-optical nanophotonic devices and polarization rotators with high transmittance in the mid-infrared range. © 1983-2012 IEEE.
语种：
英文
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Plasmon-modulated bistable four-wave mixing signals from a metal nanoparticle-monolayer MoS 2 nanoresonator hybrid system
作者：
Li, Jian-Bo* ;Tan, Xiao-Long;Ma, Jin-Hong;Xu, Si-Qin;Kuang, Zhi-Wei;...
期刊：
Nanotechnology ,2018年29(25):255704 ISSN：0957-4484
通讯作者：
Li, Jian-Bo
作者机构：
[Xu, Si-Qin; Luo, Jian-Hua; Tan, Xiao-Long; He, Meng-Dong; Ma, Jin-Hong; Chen, Li-Qun; Li, Jian-Bo; Kuang, Zhi-Wei] Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Hunan, Peoples R China.;[Liang, Shan] Hunan Normal Univ, Dept Phys, Changsha 410081, Hunan, Peoples R China.;[Xiao, Si] Cent South Univ, Sch Phys & Elect, Hunan Key Lab Super Microstruct & Ultrafast Proc, Changsha 410083, Peoples R China.;[Kim, Nam-Chol] Kim Il Sung Univ, Dept Phys, Pyongyang, North Korea.
通讯机构：
[Li, Jian-Bo] C;Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Hunan, Peoples R China.
关键词：
Computation theory;Excitons;Hybrid systems;Layered semiconductors;Metal nanoparticles;Molybdenum compounds;Monolayers;Optical bistability;Optical data processing;Optical resonators;Optical switches;Phonons;Quantum optics;Surface plasmons;Excitation conditions;Exciton-phonon interactions;Four Wave Mixing (FWM);interaction;Nanoparticle monolayers;Parameter spaces;Plasmon coupling;Quantum-information processing;Four wave mixing
摘要：
We present a study for the impact of exciton-phonon and exciton-plasmon interactions on bistable four-wave mixing (FWM) signals in a metal nanoparticle (MNP)-monolayer MoS 2 nanoresonator hybrid system. Via tracing the FWM response we predict that, depending on the excitation conditions and the system parameters, such a system exhibits 'U-shaped' bistable FWM signals. We also map out bistability phase diagrams within the system's parameter space. Especially, we show that compared with the exciton-phonon interaction, a strong exciton-plasmon interaction plays a dominant role in the generation of optical bistability, and the bistable region will be greatly broadened by shortening the distance between the MNP and the monolayer MoS 2 nanoresonator. In the weak exciton-plasmon coupling regime, the impact of exciton-phonon interaction on optical bistability will become obvious. The scheme proposed may be used for building optical switches and logic-gate devices for optical computing and quantum information processing. © 2018 IOP Publishing Ltd.
语种：
英文
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Tunable Plasmonic Dispersion and Strong Coupling in Graphene Ribbon and Double Layer Sheets Structure
作者：
Liu, Jian-Qiang* ;Wang, Dian-Yuan;Wu, Shan;He, Meng-Dong;Yu, Li-Sheng;...
期刊：
Plasmonics ,2017年12(2):309-314 ISSN：1557-1955
通讯作者：
Liu, Jian-Qiang
作者机构：
[Yu, Li-Sheng; Wang, Dian-Yuan; Liu, Jian-Qiang; Chao, Xing-Bing; Sun, Guang-Hou] Jiujiang Univ, Sch Sci, Jiujiang 332005, Peoples R China.;[Wu, Shan] Fuyang Normal Coll, Dept Phys, Fuyang 236032, Anhui, Peoples R China.;[He, Meng-Dong] Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha, Hunan, Peoples R China.
通讯机构：
[Liu, Jian-Qiang] J;Jiujiang Univ, Sch Sci, Jiujiang 332005, Peoples R China.
关键词：
Plasmon resonances;Graphene;Dispersion;Tunable
摘要：
Based on the interplay between propagating surface plasmon polaritons (PSPs) in graphene ribbon and double layer sheets structure, we theoretically demonstrate a tunable strong coupling mechanism significantly different from reported conventional noble metal nanostructures. The strong electromagnetic coupling between the low order antisymmetric and high order symmetric PSPs modes occurs due to the intersections of dispersion curves, which leads to a modification of plasmonic dispersion and multiple significant anti-crossing regions. Of particular, this strong coupling is controllable through external gate voltage of graphene sheets or ribbon. The results offer an effective regime to dynamically tune the interaction of graphene PSPs, which may find applications in the field of nanophotonic devices in the mid-infrared range.
语种：
英文
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Switching freely between superluminal & subluminal light propagation in a monolayer MoS 2 nanoresonator
作者：
Li, Jian-Bo* ;Xiao, Si;Liang, Shan;He, Meng-Dong;Kim, Nam-Chol;...
期刊：
Optics Express ,2017年25(12):13567-13576 ISSN：1094-4087
通讯作者：
Li, Jian-Bo
作者机构：
[Luo, Jian-Hua; He, Meng-Dong; Luo, Yongfeng; Chen, Li-Qun; Li, Jian-Bo] Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Hunan, Peoples R China.;[Xiao, Si] Cent South Univ, Sch Phys & Elect, Hunan Key Lab Super Microstruct & Ultrafast Proc, Changsha 410083, Hunan, Peoples R China.;[Liang, Shan] Hunan Normal Univ, Dept Phys, Changsha 410081, Hunan, Peoples R China.;[Kim, Nam-Chol] Kim II Sung Univ, Dept Phys, Pyongyang, South Korea.
通讯机构：
[Li, Jian-Bo] C;Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Hunan, Peoples R China.
关键词：
Carbon nanotubes;Excitons;Layered semiconductors;Molybdenum compounds;Monolayers;Phonons;Yarn;Absorption peaks;Device application;Exciton-phonon couplings;Group velocities;Large dispersion;Optical switching;Orders of magnitude;Propagation of lights;Slow light
摘要：
We theoretically propose a feasible scheme to advance or slow the propagation of light in a monolayer MoS 2 nanoresonator (NR). The scheme allows one to easily turn on or off the fast (superluminal) and slow (subluminal) light effects and switch freely between fast and slow light propagation by only adjusting the frequency or intensity of the pump field. As the exciton interacts strongly with the phonons in MoS 2 , the slow light effect will appear along with a large dispersion with a very steep negative slope and a sharp absorption peak. Especially, the maximal group velocity index of the slow light in the monolayer MoS 2 NR can reach two orders of magnitude larger than that in a carbon nanotube resonator. These results provide a new way to measure the exciton-phonon coupling strength and may prove useful in device applications such as optical switching and optical signal processing. © 2017 Optical Society of America.
语种：
英文
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Graphene-ribbon-coupled tunable enhanced transmission through metallic grating
作者：
Peng, Yu-Xiang;He, Meng-Dong* ;Li, Ze-Jun;Wang, Kai-Jun;Li, Shui;...
期刊：
Optics Communications ,2017年382:86-92 ISSN：0030-4018
通讯作者：
He, Meng-Dong
作者机构：
[Peng, Yu-Xiang; Li, Ze-Jun; Wang, Kai-Jun; He, Meng-Dong; Li, Shui; Li, Jian-Bo] Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410018, Hunan, Peoples R China.;[Chen, Xiaoshuang; He, Meng-Dong; Hu, Wei-Da] Chinese Acad Sci, Natl Lab Infrared Phys, Shanghai 200083, Peoples R China.;[Liu, Jian-Qiang] Jiujiang Univ, Coll Sci, Jiujiang 332005, Peoples R China.;[Long, Mengqiu] Cent S Univ, Sch Phys & Elect, Changsha 410083, Peoples R China.
通讯机构：
[He, Meng-Dong] C;Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410018, Hunan, Peoples R China.
关键词：
Diffraction gratings;Electromagnetic wave polarization;Electromagnetic wave transmission;Fermi level;Geometry;Graphene;Magnetic fields;Metals;Plasmons;Surface plasmon resonance;Enhanced transmission;Enhancement factor;Graphene plasmons;Graphene ribbons;Metallic gratings;Surface plasmon polaritons;Transmission peaks;Transmission spectrums;Light transmission
摘要：
We report the tunable enhanced transmission of light through a hybrid metal–graphene structure, in which a graphene ribbon array is situated over a metallic grating. The graphene ribbon is employed to make the graphene–insulator–metal waveguide of finite length as a Fabry–Perot (F–P) cavity. When the slit of metallic grating is opened at the position with a maximal magnetic field in F–P resonant cavity, the transmission of light through metallic grating is greatly enhanced since the strongly localized magnetic field is effectively coupled to the slit. The transmission spectrum and the enhancement factor can be adjusted by changing geometrical parameters including the width and the length of slit, the width of graphene ribbon and the period of metallic grating. The transmission peaks exhibit a broad tuning range with a small change in the Fermi energy level of graphene. Moreover, the enhancement factor of transmission peak can be manipulated by the Fermi energy level and the carrier mobility of graphene, and an enhancement factor of 154 is obtained. The findings expand our understanding of hybrid metal–graphene plasmons and have potential applications in building active plasmonic devices. © 2016 Elsevier B.V.
语种：
英文
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Bistable four-wave mixing response in a semiconductor quantum dot coupled to a photonic crystal nanocavity
作者：
Li, Jian-Bo* ;Xiao, Si;Liang, Shan;He, Meng-Dong;Luo, Jian-Hua;...
期刊：
Optics Express ,2017年25(21):25663-25673 ISSN：1094-4087
通讯作者：
Li, Jian-Bo
作者机构：
[Luo, Jian-Hua; He, Meng-Dong; Chen, Li-Qun; Li, Jian-Bo] Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Hunan, Peoples R China.;[Xiao, Si] Cent S Univ, Sch Phys & Elect, Hunan Key Lab Super Microstruct & Ultrafast Proc, Changsha 410083, Hunan, Peoples R China.;[Liang, Shan] Hunan Normal Univ, Dept Phys, Changsha 410081, Hunan, Peoples R China.;[Liang, Shan] Shenzhen Univ, Key Lab Optoelect Devices & Syst, Minist Educ & Guangdong Prov, Shenzhen 518060, Peoples R China.;[Kim, Nam-Chol] Kim II Sung Univ, Dept Phys, Pyongyang, North Korea.
通讯机构：
[Li, Jian-Bo] C;Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Hunan, Peoples R China.
关键词：
Four wave mixing;Nanocrystals;Optical switches;Photonic crystals;Coupling strengths;Excitation frequency;Four Wave Mixing (FWM);Parameter subspace;Photonic crystal nanocavity;Pumping intensity;Theoretical study;Vacuum Rabi splitting;Semiconductor quantum dots
摘要：
We perform a theoretical study of the bistable four-wave mixing (FWM) response in a coupled system comprised of a semiconductor quantum dot (SQD) and a photonic crystal (PC) nanocavity in which the SQD is embedded. It is shown that the shape of the FWM spectrum can switch among single-peaked, double-peaked, triple-peaked, and four-peaked arising from the vacuum Rabi splitting and the exciton-nanocavity coupling. Especially, we map out bistability phase diagrams within a parameter subspace of the system, and find that it is easy to turn on or off the bistable FWM response by only adjusting the excitation frequency or the pumping intensity. Our results offer a feasible means for measuring the SQD-PC nanocavity coupling strength and open a new avenue to design optical switches and memories. © 2017 Optical Society of America.
语种：
英文
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Formation of surface nanobubbles on nanostructured substrates
作者：
Wang, Lei;Wang, Xingya;Wang, Liansheng;Hu, Jun;Wang, Chun Lei;...
期刊：
Nanoscale ,2017年9(3):1078-1086 ISSN：2040-3364
通讯作者：
He, Mengdong;Zhang, Lijuan
作者机构：
[Chen, Liqun; Wang, Lei; He, Mengdong] Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Hunan, Peoples R China.;[Tai, Renzhong; Wang, Xingya; Wang, Liansheng; Wang, Lei; Zhang, Lijuan] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China.;[Hu, Jun; Zhao, Binyu] Chinese Acad Sci, Shanghai Inst Appl Phys, Lab Phys Biol, Shanghai 201800, Peoples R China.;[Hu, Jun; Wang, Chun Lei; Zhao, Binyu] Chinese Acad Sci, Shanghai Inst Appl Phys, Key Lab Interfacial Phys & Technol, Shanghai 201800, Peoples R China.;[Wang, Chun Lei] Chinese Acad Sci, Shanghai Inst Appl Phys, Div Interfacial Water, Shanghai 201800, Peoples R China.
通讯机构：
[He, Mengdong; Zhang, Lijuan] C;Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Hunan, Peoples R China.;Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China.
关键词：
Atomic force microscopy;Electron beam lithography;Hydrophobicity;Lithography;Molecular dynamics;Nucleation;Phase interfaces;Hydrophilic domains;Hydrophobic domains;Molecular dynamics simulations;Nano-patterned surfaces;Nanostructured substrates;Physical and chemical properties;Research interests;Solid/liquid interfaces;Surface properties
摘要：
The nucleation and stability of nanoscale gas bubbles located at a solid/liquid interface are attracting significant research interest. It is known that the physical and chemical properties of the solid surface are crucial for the formation and properties of the surface nanobubbles. Herein, we experimentally and numerically investigated the formation of nanobubbles on nanostructured substrates. Two kinds of nanopatterned surfaces, namely, nanotrenches and nanopores, were fabricated using an electron beam lithography technique and used as substrates for the formation of nanobubbles. Atomic force microscopy images showed that all nanobubbles were selectively located on the hydrophobic domains but not on the hydrophilic domains. The sizes and contact angles of the nanobubbles became smaller with a decrease in the size of the hydrophobic domains. The results indicated that the formation and stability of the nanobubbles could be controlled by regulating the sizes and periods of confinement of the hydrophobic nanopatterns. The experimental results were also supported by molecular dynamics simulations. The present study will be very helpful for understanding the effects of surface features on the nucleation and stability of nanobubbles/nanodroplets at a solid/liquid interface. ©2017 The Royal Society of Chemistry.
语种：
英文
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Asymmetric transmission and polarization conversion of linearly polarized waves with bilayer L-shaped metasurfaces
作者：
Shang, Xiong-Jun;Zhai, Xiang;Wang, Ling-Ling* ;He, Meng-Dong;Li, Quan;...
期刊：
APPLIED PHYSICS EXPRESS ,2017年10(5):052602 ISSN：1882-0778
通讯作者：
Wang, Ling-Ling
作者机构：
[Duan, Hui-Gao; Shang, Xiong-Jun; Zhai, Xiang; Li, Quan; Luo, Xin; Wang, Ling-Ling] Hunan Univ, Sch Phys & Elect, Minist Educ, Key Lab Micronano Optoelect Devices, Changsha 410082, Hunan, Peoples R China.;[He, Meng-Dong] Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[Wang, Ling-Ling] H;Hunan Univ, Sch Phys & Elect, Minist Educ, Key Lab Micronano Optoelect Devices, Changsha 410082, Hunan, Peoples R China.
摘要：
We numerically and theoretically investigate the optical anisotropy of ultra-Thin bilayer L-shaped metal metasurfaces separated by a 200-nm-Thick silicon dioxide (SiO2) substrate spacer. A broadband asymmetric transmission (AT) to forward and backward propagate electromagnetic waves can be acquired from linearly polarized waves. Additionally, narrowband cross-polarization conversion (CPC) can be realized by x linearly polarized electromagnetic illumination. The calculated results demonstrate that the full width at half maximum (FWHM) of AT is 965 nm, and the maximum value of the asymmetric parameter can reach up to 0.48. The polarization conversion rate (PCR) for CPC is more than 80%. © 2017 The Japan Society of Applied Physics.
语种：
英文
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Unusual luminescence and temperature dependent decay behavior of divalent europium ion in KBaBP2 O8
作者：
Wu, Luyi;Zhang, Xinmin* ;Yang, Jiaxin;Xu, Yang;Zhang, Hongzhi;...
期刊：
Journal of Luminescence ,2017年192:616-619 ISSN：0022-2313
通讯作者：
Zhang, Xinmin
作者机构：
[Wu, Luyi; Xu, Yang; Yuan, Guangming; Yang, Jiaxin; Zhang, Hongzhi; Zhang, Xinmin] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[He, Mengdong] Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Hunan, Peoples R China.;[Seo, Hyo Jin] Pukyong Natl Univ, Dept Phys, Busan 608737, South Korea.;[Seo, Hyo Jin] Pukyong Natl Univ, Interdisciplinary Program Biomed Mech & Elect Eng, Busan 608737, South Korea.
通讯机构：
[Zhang, Xinmin] C;Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
关键词：
Emission spectroscopy;Phosphors;Photoluminescence;Decay;Divalent europium;Emission bands;Emission spectrums;KBaBP2O8:Eu^2+;Photoluminescence properties;Temperature dependent;Thermal population;Europium
摘要：
The unusual photoluminescence (PL) properties and temperature dependent decay behavior of Eu2+ in KBaBP2O8 are reported and discussed. The emission spectrum is so complicate that it can be deconvoluted into three fitting peaks. The emission bands peaking at 380 and 444nm can be assigned to the 4f65d1→4f7 transition of Eu2+ centers substituting for K+ and Ba2+ site, while the emission band at 497nm may be attributed to the Eu2+ center on K+ site with a nearby charge-compensated vacancy. The decay time of the 4f65d emission increases with temperature. This increase can be explained by either thermal population of the 4f7 (6P7/2) level or thermal population of higher energetic 4f65d states. © 2017 Elsevier B.V.
语种：
英文
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Luminescence properties of Eu2+ in silver decacalcium heptakis-orthophosphate AgCa10 (PO4 )7
作者：
Zhang, Hongzhi;Zhang, Xinmin* ;Wu, Luyi;Zheng, Wei;Jiang, Wei;...
期刊：
Journal of Luminescence ,2017年185:120-124 ISSN：0022-2313
通讯作者：
Zhang, Xinmin
作者机构：
[Wu, Luyi; Yuan, Guangming; Zheng, Wei; Jiang, Wei; Zhang, Hongzhi; Zhang, Xinmin] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Peoples R China.;[He, Mengdong] Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Peoples R China.;[Seo, Hyo Jin] Pukyong Natl Univ, Dept Phys, Busan 608737, South Korea.;[Seo, Hyo Jin] Pukyong Natl Univ, Interdisciplinary Program Biomed Mech & Elect Eng, Busan 608737, South Korea.
通讯机构：
[Zhang, Xinmin] C;Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Peoples R China.
关键词：
Crystal structure;Energy transfer;Europium;Light emission;Luminescence of inorganic solids;Optical properties;Phosphors;Temperature;Decay;Decay curves;Decay time;Emission wavelength;Energy transfer process;Low temperatures;Luminescence properties;Photoluminescence spectrum;Luminescence
摘要：
The luminescence properties of Eu2+ in AgCa10(PO4)7 has been studied at room and low temperature and the decay times of Eu2+ in this matrix have been measured and analyzed. According to the crystal structure of AgCa10(PO4)7, photoluminescence (PL) spectra and decay curves, the substitution of Eu2+ ions is possible to four different Ca2+ sites. The red-shift of emission wavelength and energy transfer process between Eu2+ activator ions are discussed. © 2017 Elsevier B.V.
语种：
英文
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Study on temperature sensitivity of topological insulators based on long-period fiber grating
作者：
Luo, Jianhua* ;Zhao, Chenghai;Li, Jianbo;He, Mengdong
期刊：
Optical Engineering ,2017年56(6):067106 ISSN：0091-3286
通讯作者：
Luo, Jianhua
作者机构：
[Luo, Jianhua; He, Mengdong; Li, Jianbo; Zhao, Chenghai] Cent South Univ Forestry & Technol, Coll Sci, Changsha, Hunan, Peoples R China.
通讯机构：
[Luo, Jianhua] C;Cent South Univ Forestry & Technol, Coll Sci, Changsha, Hunan, Peoples R China.
关键词：
long-period fiber grating;topological insulators;temperature sensitivity;Dielectrics;Capillaries;Numerical simulations;Temperature metrology;Ultraviolet radiation
摘要：
Based on a long-period fiber grating, we conducted experimental research on the temperature sensitivity of topological insulators. The long-period fiber grating and topological insulators solution were encapsulated in a capillary tube using UV glue, and the temperature response was measured. Within a range of 35 to 75 centigrade, one resonance dip of a long-period fiber grating exhibits a redshift of 1.536 nm. The temperature sensitivity is about 7.7 times of an ordinary long-period fiber grating's sensitivity (0.005 nm/°C). A numerical simulation is also performed on the basis of the experiments. © 2017 Society of Photo-Optical Instrumentation Engineers (SPIE).
语种：
英文
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Plasmon Resonances in a Periodic Square Coaxial Hole Array in a Graphene Sheet
作者：
Wang, Kai-Jun;Peng, Yu-Xiang;Wang, Lei;He, Meng-Dong* ;Li, Ze-Jun;...
期刊：
Plasmonics ,2016年11(4):1129-1137 ISSN：1557-1955
通讯作者：
He, Meng-Dong
作者机构：
[Peng, Yu-Xiang; Li, Ze-Jun; Wang, Kai-Jun; Liu, Ling-Hong; Wang, Lei; Wang, Xin-Jun; He, Meng-Dong; Li, Jian-Bo] Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Peoples R China.;[Liu, Jian-Qiang] Jiujiang Univ, Coll Sci, Jiujiang 332005, Peoples R China.;[Xu, Liang] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Chen, Xiaoshuang; Hu, Wei-Da] Chinese Acad Sci, Shanghai Inst Tech Phys, Natl Lab Infrared Phys, Shanghai 200083, Peoples R China.
通讯机构：
[He, Meng-Dong] C;Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Peoples R China.
关键词：
Plasmon resonances;Graphene;Square coaxial hole array;Electromagnetic coupling
摘要：
We present a computational study of the plasmon resonances in a periodic square coaxial hole array in a graphene sheet, which consists of a square hole array and a square strip array. According to charge oscillation picture, we find that a new plasmon mode, which locates on the edges of square hole along the polarization direction of incident light, emerges in our proposed structure. Two hybridized plasmon resonance modes (i.e., symmetric and asymmetric plasmon resonance modes) are formed due to two different manners of coupling between the new plasmon mode of square hole and the plasmon mode of square strip. The two plasmon resonance modes can be tuned over a wide wavelength range by a small change in the chemical potential of graphene. Furthermore, the two plasmon resonances can also be controlled by changing L
x
and L
y
(which are the strip offsets from the hole center perpendicular and parallel to the polarization direction of incident light, respectively), originating from the change in the strength of electromagnetic coupling between square hole and square strip. Our study gives an insight into the physical mechanism of plasmon resonances in square graphene coaxial hole array, and our findings will be useful for designing graphene-based plasmonic devices and metamaterials.
语种：
英文
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Four-wave mixing signal enhancement and optical bistability of a hybrid metal nanoparticle-quantum dot molecule in a nanomechanical resonator
作者：
Li, Jian-Bo* ;Liang, Shan;Xiao, Si;He, Meng-Dong;Kim, Nam-Chol;...
期刊：
Optics Express ,2016年24(3):2360-2369 ISSN：1094-4087
通讯作者：
Li, Jian-Bo
作者机构：
[Peng, Yu-Xiang; Guo, Ze-Ping; He, Meng-Dong; Chen, Li-Qun; Wu, Gui-Hong; Li, Jian-Bo; Luo, Xiao-Yu] Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Hunan, Peoples R China.;[Liang, Shan] Hunan Normal Univ, Dept Phys, Changsha 410081, Hunan, Peoples R China.;[Xiao, Si] Cent S Univ, Sch Phys & Elect, Hunan Key Lab Super Microstruct & Ultrafast Proc, Changsha 410083, Hunan, Peoples R China.;[Kim, Nam-Chol] Kim Il Sung Univ, Dept Phys, Pyongyang, North Korea.
通讯机构：
[Li, Jian-Bo] C;Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Hunan, Peoples R China.
关键词：
Excitons;Metal nanoparticles;Nanocrystals;Nanosystems;Optical signal processing;Phonons;Resonators;Semiconductor quantum dots;Exciton-phonon interactions;Four Wave Mixing (FWM);Hybrid nanosystem;Nanomechanical resonators;Pumping intensity;Quantum dot molecules;Quantum switch;Three orders of magnitude;Four wave mixing
摘要：
We investigate theoretically four-wave mixing (FWM) response and optical bistability (OB) in a hybrid nanosystem composed of a metal nanoparticle (MNP) and a semiconductor quantum dot (SQD) coupled to a nanomechanical resonator (NR). It is shown that the FWM signal is enhanced by more than three orders of magnitude as compared to that of the system without exciton-phonon interaction, and the FWM signal can also be suppressed significantly and broadened due to the exciton-plasmon interaction. As the MNP couples strongly with the SQD, the bistable FWM response can be achieved by adjusting the SQD-MNP distance and the pumping intensity. For a given pumping constant and a fixed SQD-MNP distance, the enhanced exciton-phonon interaction can promote the occurrence of bistability. Our findings not only present a feasible way to detect the spacing between two nanoparticles, but also hold promise for developing quantum switches and nanoscale rulers. © 2016 Optical Society of America.
语种：
英文
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Light transmission through a one-dimensional metallic grating covered by a reduced cytochrome c molecule layer
作者：
Wang, Kai-Jun;Peng, Yu-Xiang;Wang, Lei;Liu, Ling-Hong;Li, Ze-Jun;...
期刊：
International Journal of Modern Physics B ,2016年30(16):1650088 ISSN：0217-9792
通讯作者：
He, Meng-Dong
作者机构：
[Peng, Yu-Xiang; Li, Ze-Jun; Wang, Kai-Jun; Liu, Ling-Hong; Wang, Lei; Wang, Xin-Jun; He, Meng-Dong; Li, Jian-Bo] Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Hunan, Peoples R China.;[Xu, Liang] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[He, Meng-Dong] C;Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Hunan, Peoples R China.
关键词：
Surface plasmon polaritons;plasmon resonance energy transfer;metallic grating;reduced cytochrome c molecule
摘要：
We investigate the transmission characteristics of a one-dimensional metallic grating covered by a reduced cytochrome (Cyt) c molecule layer by using the finite-difference time-domain (FDTD) method. It is found that the introduction of reduced Cyt c molecule layer leads to a transmission dip due to the plasmon resonance energy transfer (PRET) from metallic grating to Cyt c molecules. The transmission dip depth can be controlled by the period of metallic grating, the width and length of slit, and the Cyt c molecule layer number, while the transmission dip wavelength is unchanged with these parameters. The findings expand our understanding of the PRET phenomenon and have potential applications in molecule identification and detection. © 2016 World Scientific Publishing Company.
语种：
英文
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Optical properties of a metallic nanoparticle array covered by a reduced cytochrome c molecule layer
作者：
Peng, Yu-Xiang;Wang, Kai-Jun;Zhang, Xin-Min;Wang, Ying;Li, Ze-Jun;...
期刊：
Optical and Quantum Electronics ,2016年48(12):1-11 ISSN：0306-8919
通讯作者：
He, Meng-Dong
作者机构：
[Zhang, Xin-Min; Peng, Yu-Xiang; Li, Ze-Jun; Luo, Jian-Hua; Wang, Kai-Jun; Liu, Ling-Hong; Wang, Ying; Wang, Xin-Jun; He, Meng-Dong; Li, Jian-Bo] Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Hunan, Peoples R China.;[Liu, Jian-Qiang] Jiujiang Univ, Coll Sci, Jiujiang 332005, Peoples R China.
通讯机构：
[He, Meng-Dong] C;Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Hunan, Peoples R China.
关键词：
Localized surface plasmon resonance;Plasmon resonance energy transfer;Metallic nanoparticle array;Reduced cytochrome c molecule
摘要：
We investigate the optical properties of a metallic nanoparticle array covered by a reduced cytochrome (Cyt) c molecule layer by using the finite-difference time-domain method. As the wavelength of the surface plasmon resonance of metallic nanoparticle array matches with that of the absorption peak of reduced Cyt c molecules, a pronounced spectral dip forms in extinction spectrum due to the plasmon resonance energy transfer from metallic nanoparticles to Cyt c molecules. The depth of extinction dip can be controlled by the length and width of metallic nanoparticle, the grating constant, and the Cyt c molecule layer number, though the position of extinction dip is unchanged with these parameters. The findings may find applications in molecule identification and detection. © 2016, Springer Science+Business Media New York.
语种：
英文
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