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Pulsed microwave-driven argon plasma jet with distinctive plume patterns resonantly excited by surface plasmon polaritons

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Chinese Physics B 2015年第2期24卷 302-312页

作者：陈兆权殷志祥夏广庆洪伶俐胡业林刘明海胡希伟 A.A.Kudryavtsev College of Electrical & Information Engineering Anhui University of Science and Technology Faculty of Physics St. Petersburg State University State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

Atmospheric lower-power pulsed microwave argon cold plasma jets are obtained by using coaxial transmission line resonators in ambient air.The plasma jet plumes are generated at the end of a metal wire placed in the middle of the dielectric tubes.The electromagnetic model analyses and simulation results suggest that the discharges are excited resonantly by the enhanced electric field of surface plasmon polaritons.Moreover,for conquering the defect of atmospheric argon filamentation discharges excited by 2.45-GHz of continued microwave,the distinctive patterns of the plasma jet plumes can be maintained by applying different gas flow rates of argon gas,frequencies of pulsed modulator,duty cycles of pulsed microwave,peak values of input microwave power,and even by using different materials of dielectric tubes.In addition,the emission spectrum,the plume temperature,and other plasma parameters are measured,which shows that the proposed pulsed microwave plasma jets can be adjusted for plasma biomedical applications.

关键词： pulsed microwave discharge surface plasmon polaritons atmospheric argon cold plasma jet distinctive plasma plume patterns

Active control of surface plasmon polaritons with phase change materials

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Chinese Physics B 2023年第10期32卷 428-432页

作者：漆元臻蒋瞧向红韩德专 Department of Physics and Chongqing Key Laboratory for Strongly Coupled Physics Chongqing UniversityChongqing 401331China

Active control of surface plasmon polaritons(SPPs)is highly desired for nanophotonics.Here we employ a phase change material Ge_(2)Sb_(2)Te_(5)(GST)to actively manipulate the propagating direction of SPPs at the telecom wavelength.By utilizing the phase transition-induced refractive index change of GST,coupled with interference effects,a nanoantenna pair containing GST is designed to realize switchable one-way launching of SPPs.Devices based on the nanoantenna pairs are proposed to manipulate SPPs,including the direction tuning of SPP beams,switchable SPP focusing,and switchable cosine–Gauss SPP beam generating.Our design can be employed in compact optical circuits and photonics integration.

关键词： surface plasmon polaritons phase change materials direction control non-diffractive

Long-range surface plasmon polaritons with subwavelength mode expansion in an asymmetrical system

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Chinese Physics B 2009年第8期18卷 3535-3541页

作者：陈建军李智龚旗煌 State Key Laboratory for Mesoscopic Physics and Department of Physics Peking University

Long-range surface plasmon polariton （LRSPP） modes in an asymmetrical system, in which the thin metal film is sandwiched between a semi-infinite substrate and a high permittivity polymer film with a finite thickness, are theoret~ ically calculated and analyzed. Due to the high permittivity of the polymer film, at proper polymer film thicknesses, the index-matching condition of the dielectrics at both sides of the metal can be satisfied for supporting LRSPP modes, and the electromagnetic field above the metal can be localized well. It is found that these LRSPP modes have both long propagation lengths and subwavelength mode expansion above the metal at the optimal polymer film thickncsses. Furthermore, the requirements on the refractive index and the thickness of the polymer film to support LRSPP modes at the optimal thicknesses are found to be not critical.

关键词： surface plasmon polaritons field intensity confinement long propagation length integrated optics

Electromagnetic interaction between local surface plasmon polaritons and an atmospheric surface wave plasma jet

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Chinese Physics B 2014年第3期23卷 404-411页

作者：陈兆权胡东刘明海夏广庆郑晓亮胡业林叶秋波陈明功祝龙记胡希伟 College of Electrical & Information Engineering Anhui University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology State Key Laboratory of Structure Analysis for Industrial Equipment Dalian University of Technology

We analyze the electromagnetic interaction between local surface plasmon polaritons （SPPs） and an atmospheric surface wave plasma jet （ASWPJ） in combination with our designed discharge device. Before discharge, the excitation of the SPPs and the spatial distribution of the enhanced electric field are analyzed. During discharge, the critical breakdown electric field of the gases at atmospheric gas pressure and the surface wave of the SPPs converted into electron plasma waves at resonant points are studied. After discharge, the ionization development process of the ASWPJ is simulated using a two- dimensional fluid model. Our results suggest that the local enhanced electric field of SPPs is merely the precondition of gas breakdown, and the key mechanism in maintaining the discharge development of a low-power ASWPJ is the wave-mode conversion of the local enhanced electric field at the resonant point.

关键词： surface wave plasma surface plasmon polaritons numerical simulation electromagnetic interac-tion

Efficient unidirectional polarization-controlled excitation of surface plasmon polaritons

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Light(Science & Applications) 2014年第1期3卷 100-105页

作者： Anders Pors Michael G Nielsen Thomas Bernardin Jean-Claude Weeber Sergey I Bozhevolnyi Department of Technology and Innovation University of Southern DenmarkOdenseDenmark LICB UMR 6303 CNRS–University of BurgundyF-21078 DijonFrance

Efficient excitation of surface plasmon polaritons(SPPs)remains one of the most challenging issues in areas of plasmonics related to information communication technologies.In particular,combining high SPP excitation efficiency and acceptance of any polarization of incident light appeared to be impossible to attain due to the polarized nature of SPPs.Here we demonstrate plasmonic couplers that represent arrays of gap SPP resonators producing upon reflection two orthogonal phase gradients in respective linear polarizations of incident radiation.These couplers are thereby capable of efficiently converting incident radiation with arbitrary polarization into SPPs that propagate in orthogonal directions dictated by the phase gradients.Fabricated couplers operate at telecom wavelengths and feature the coupling efficiency of,25%for either of two linear polarizations of incident radiation and directivity of SPP excitation exceeding 100.We further demonstrate that an individual wavelength-sized unit cell,representing a meta-scatterer,can also be used for efficient and polarization sensitive SPP excitation in compact plasmonics circuits.

关键词： gap surface plasmons metamaterials metasurfaces surface plasmon polaritonsgap surface plasmons metamaterials metasurfaces surface plasmon polaritons

On-chip photonic Fourier transform with surface plasmon polaritons

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Light(Science & Applications) 2016年第1期5卷 618-623页

作者： Shan Shan Kou Guanghui Yuan Qian Wang Luping Du Eugeniu Balaur Daohua Zhang Dingyuan Tang Brian Abbey Xiao-Cong Yuan Jiao Lin Department of Chemistry and Physics La Trobe Institute for Molecular Science(LIMS)La Trobe UniversityMelbourneVIC 3086Australia Australian Research Council Centre of Excellence for Advanced Molecular Imaging Australia School of Physics The University of MelbourneVIC 3010Australia Centre for Disruptive Photonic Technologies Nanyang Technological UniversitySingapore 637371Singapore Institute of Materials Research and Engineering A*STAR3 Research LinkSingapore 117602Singapore Nanophotonics Research Centre Shenzhen University&Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore School of Engineering RMIT UniversityMelbourneVIC 3001Australia

The Fourier transform(FT),a cornerstone of optical processing,enables rapid evaluation of fundamental mathematical operations,such as derivatives and integrals.Conventionally,a converging lens performs an optical FT in free space when light passes through it.The speed of the transformation is limited by the thickness and the focal length of the lens.By using the wave nature of surface plasmon polaritons(SPPs),here we demonstrate that the FT can be implemented in a planar configuration with a minimal propagation distance of around 10 mm,resulting in an increase of speed by four to five orders of magnitude.The photonic FT was tested by synthesizing intricate SPP waves with their Fourier components.The reduced dimensionality in the minuscule device allows the future development of an ultrafast on-chip photonic information processing platform for large-scale optical computing.

关键词： diffraction Fourier optics optical computing optical information processing surface plasmon polaritons

Character Diagnosis for surface-Wave Plasmas Excited by surface plasmon polaritons

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Plasma Science and Technology 2012年第8期14卷 754-758页

作者：陈兆权夏广庆刘明海胡业林郑晓亮李平周启燕胡希伟 College of Electrical&Information Engineering Anhui University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology State Key Laboratory of Structure Analysis for Industrial Equipment Dalian University of Technology

The plasma parameters of planar-type surface-wave plasmas （SWPs） are diagnosed based on the resonant excitation of surface plasmon polaritons （SPPs）. The plasma parameter distributions are obtained by changing the discharge conditions of gas pressure and incident power. The measured experimental results show that the plasma near the heating layer is excited by surface waves of SPPs while the plasma located downstream originates from diffusion Moreover, the influence of high-frequency oscillations plays a significant role in producing the proposed SWPs with bi-Maxwellian electron energy distributions.

关键词： surface-wave plasmas plasma diagnosing surface plasmon polaritons

Mode evolution and nanofocusing of grating-coupled surface plasmon polaritons on metallic tip

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Opto-Electronic Advances 2018年第6期1卷 1-7页

作者： Fanfan Lu Wending Zhang Ligang Huang Shuhai Liang Dong Mao Feng Gao Ting Mei Jianlin Zhao MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information Technology School of Science Northwestern Polytechnical University Xi'an 710072 China Key Laboratory of Optoelectronic Technology and Systems (Ministry of Education) Chongqing University Chongqing 400044 China MOE Key Laboratory of Weak-Light Nonlinear Photonics TEDA Applied Physics Institute and School of Physics Nankai University Tianjin 300457 China

We present a detailed analysis on mode evolution of grating-coupled surface plasmonic polaritons (SPPs) on a conical metal tip based on the guided-wave theory. The eigenvalue equations for SPPs modes are discussed, revealing that cylindrical metal waveguides only support TM01 and HEm1 surface modes. During propagation on the metal tip, the grating- coupled SPPs are converted to HE31, HE21, HE11 and TM01 successively, and these modes are sequentially cut off except TM01. The TM01 mode further propagates with drastically increasing effective mode index and is converted to localized surface plasmons (LSPs) at the tip apex, which is responsible for plasmonic nanofocusing. The gap-mode plasmons can be excited with the focusing TM01 mode by approaching a metal substrate to the tip apex, resulting in further enhanced electric field and reduced size of the plasmonic focus. © 2018 Institute of Optics and Electronics, Chinese Academy of Sciences. All rights reserved.

关键词： Electromagnetic field enhancement Metal nanostructures plasmonic tip nanofocusing surface plasmon polaritons

Field-level characterization of strong coupling between excitons and surface plasmon polaritons in J-aggregate/metal hybrid nanostructures

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光电工程 2017年第2期44卷 202-208+242页

作者： Wei Wang Ephraim Sommer Antonietta De Sio Parinda Vasa Juemin Yi Hong Zhang College of Physical Science and Technology Sichuan University Institut für Physik Carl von Ossietzky Universit?t Key Laboratory of High Energy Density Physics and Technology of Ministry of Education Sichuan University Department of Physics Indian Institute of Technology

White-light broadband chirp-compensated spectral interferometry is applied to fully probe the optical response of strongly coupled excitons(Xs)and surface plasmon polaritons(SPPs)in J-aggregate/metal hybrid nanostructures at field level.Under impulsive excitation,amplitude and spectral phase of the sample reflectivity are measured with high precision and the time structure of the electric field emitted by the hybrid modes of the nanostructures is accurately reconstructed.Quantitative description of strong X-SPP coupling is precisely obtained by fitting both measured spectra and phases simultaneously to a Fano lineshape model.

关键词： surface plasmon polaritons spectral interferometry subwavelength nanostructures strong coupling