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Subwavelength negative-index waveguiding enabled by coupled spoof magnetic localized surface plasmons

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Photonics Research 2019年第3期7卷 274-282页

作者： ZHEN LIAO GUO QING LUO BEN GENG CAI BAI CAO PAN WEN HUI CAO Key Laboratory of RF Circuits & System of Ministry of Education Institute of Antennas and Microwave Technology Hangzhou Dianzi UniversityXiasha High Education Park

Magnetic localized surface plasmon modes are supported on metallic spiral structures. Coupling mechanisms for these metamaterial resonators, which are the joint action of magnetic and electric coupling, are studied. Based on the strong coupling, spoof magnetic plasmon modes propagating in the backward direction are proposed along a chain of subwavelength resonators. The theoretical analysis, numerical simulations, and experiments are in good agreement. The proposed novel route for achieving negative-index waveguiding has potential applications in integrated devices and circuits.

关键词： Subwavelength negative-index waveguiding coupled spoof magnetic localized surface plasmons Magnetic localized surface plasmon modes

Acceleration of Flare Protons by Langmuir plasmons

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Chinese Physics Letters 2002年第2期19卷 283-285页

作者：李晓卿张航 DepartmentofPhysics NanjingNormalUniversityNanjing210097

We analytically study the turbulent acceleration of solar protons by strong Langmuir plasmons in Cerenkov processes. It is shown that among the wave spectra with self-retained source only the Pelletier spectrum (Wk ∝ k-7/2) can result in energy spectrum of non-relativistic protons, which gives a good fit to that observed from solar flare event. It is quite possible that strong Langmuir turbulence presents in coronal active region, with three-dimensional, isotropic and stationary spectrum proportional to k-7/2, and is responsible for the acceleration of flare protons.

关键词： plasmons

Excitation of Propagating plasmons in Semi-Infinite Graphene Layer by Free Space Photons

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Communications in Theoretical Physics 2014年第6期61卷 751-754页

作者：张磊符秀丽杨俊忠 School of Science Beijing University of Posts and Telecommunications

By investigating the diffraction of plane waves by a semi-infinite solution for propagating surface plasmons in graphene, which can be excited graphene edge. The theoretical results are confirmed by numerical simulations. excite propagating surface plasmons in graphene where the graphene edge plays graphene layer, we present a rigorous by incident plane waves through the Our results reveal a convenient way to an important role.

关键词： plasmons excitation graphene edge

Exploring plasmons weakly coupling to perovskite excitons with tunable emission by energy transfer

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Chinese Physics B 2023年第6期32卷 537-544页

作者：严国栋张振华郭衡陈金平蒋青松崔乾楠石增良徐春祥 State Key Laboratory of Bioelectronics School of PhysicsSoutheast UniversityNanjing 210096China Faculty of Electronic Information Engineering Huaiyin Institute of TechnologyHuaian 223001China

Localized surface plasmon resonance(LSPR) has caused extensive concern and achieved widespread applications in optoelectronics. However, the weak coupling of plasmons and excitons in a nanometal/semiconductor system remains to be investigated via energy transfer. Herein, bandgap tunable perovskite films were synthesized to adjust the emission peaks,for further coupling with stable localized surface plasmons from gold nanoparticles. The degree of mismatch, using steadystate and transient photoluminescence(PL), was investigated systematically in two different cases of gold nanoparticles that were in direct contacting and insulated. The results demonstrated the process of tuning emission coupled to LSPR via wavelength-dependent photoluminescence intensity in the samples with an insulating spacer. In the direct contact case,the decreased radiative decay rate involves rapid plasmon resonance energy transfer to the perovskite semiconductor and non-radiative energy transfer to metal nanoparticles in the near-field range.

关键词： plasmons photoluminescence tunable emission perovskite

λ/20-Thick cavity for mimicking electromagnetically induced transparency at telecommunication wavelengths

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Advanced Photonics 2024年第3期6卷 42-50页

作者： Hua Lu Shouhao Shi Dikun Li Shuwen Bo Jianxu Zhao Dong Mao Jianlin Zhao Northwestern Polytechnical University School of Physical Science and Technology MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions Key Laboratory of Light-Field Manipulation and Information Acquisition Ministry of Industry and Information TechnologyShaanxi Key Laboratory of Optical Information Technology

Optical cavities play crucial roles in enhanced light–matter interaction, light control, and optical communications, but their dimensions are limited by the material property and operating *** planar cavities are urgently in demand for large-area and integrated optical devices. However,extremely reducing the planar cavity dimension is a critical challenge, especially at telecommunication wavelengths. Herein, we demonstrate a type of ultrathin cavities based on large-area grown Bi2Te3topological insulator（TI） nanofilms, which present distinct optical resonance in the near-infrared region. The result shows that the Bi2Te3TI material presents ultrahigh refractive indices of >6 at telecommunication wavelengths. The cavity thickness can approach 1/20 of the resonance wavelength, superior to those of planar cavities based on conventional Si and Ge high refractive index materials. Moreover, we observed an analog of the electromagnetically induced transparency（EIT） effect at telecommunication wavelengths by depositing the cavity on a photonic crystal. The EIT-like behavior is derived from the destructive interference coupling between the nanocavity resonance and Tamm plasmons. The spectral response depends on the nanocavity thickness, whose adjustment enables the generation of obvious Fano *** experiments agree well with the simulations. This work will open a new door for ultrathin cavities and applications of TI materials in light control and devices.

关键词： Bismuth Tellurium Refractive index Nanofilms Photonic crystals Transparency Silver Telecommunications Crystals plasmons

Valley filtering and valley-polarized collective modes in bulk graphene monolayers

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Chinese Physics B 2024年第1期33卷 1-15页

作者：郑建龙翟峰 Department of Physics Zhejiang Normal UniversityJinhua 321004China Zhejiang Institute of Photoelectronics Zhejiang Normal UniversityJinhua 321004China

The presence of two sublattices in hexagonal graphene brings two energetically degenerate extremes in the conduction and valence bands, which are identified by the valley quantum number. Recently, this valley degree of freedom has been suggested to encode and process information, which develops a new carbon-based electronics named graphene valleytronics. In this topical review, we present and discuss valley-related transport properties in bulk graphene monolayers,which are due to strain-induced pseudomagnetic fields and associated vector potential, sublattice-stagger potential, and the valley-Zeeman effect. These valley-related interactions can be utilized to obtain valley filtering, valley spatial separation, valley-resolved guiding modes, and valley-polarized collective modes such as edge or surface plasmons. The present challenges and the perspectives on graphene valleytronics are also provided in this review.

关键词： valleytronics graphene strain valley-Zeeman effect plasmons

Metal-dielectric-metal plasmonic waveguide devices for manipulating light at the nanoscale

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Chinese Optics Letters 2009年第4期7卷 302-308页

作者： Georgios Veronis Zongfu Yu Sukru Ekin Kocaba David A. B. Miller Mark L. Brongersma Shanhui Fan Department of Electrical and Computer Engineering and Center for Computation and Technology Louisiana State University Baton Rouge LA 70803 USA Ginzton LaSoratory Stanford University Stanford CA 94305 USA GeSalle LaSoratory of Advanced Materials Stanford University Stanford CA 94305 USA

We review some of the recent advances in the development of subwavelength plasmonic devices for manipulating light at the nanoseale, drawing examples from our own work in metal-dielectric-metal （MDM） plasmonic waveguide devices. We introduce bends, splitters, and mode converters for MDM waveguides with no additional loss. We also demonstrate that optical gain provides a mechanism for on/off switching in MDM plasmonic waveguides. Highly efficient compact couplers between dielectric waveguides and MDM waveguides are also introduced.

关键词： Metals Multiplexing Nanotechnology Optical waveguides plasmons Waveguide components Waveguides

Collective excitations and quantum size effects on the surfaces of Pb(111)films:An experimental study

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Chinese Physics B 2021年第7期30卷 74-82页

作者： Yade Wang Zijian Lin Siwei Xue Jiade Li Yi Li Xuetao Zhu Jiandong Guo Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China

Pb(111)film is a special system that exhibits strong quantum size effects in many electronic *** collective excitations,i.e.,plasmons,in Pb(111)films are also expected to show signatures of the quantum size ***,using high-resolution electron energy loss spectroscopy,we measured the plasmons on the surface of Pb(111)films with different film thicknesses and analyzed the plasmon *** surface plasmon branch exhibits prominent damping in the small momentum range,which can be attributed to the interaction between the top and bottom interfaces of the Pb(111)*** the film thickness increasing,the critical momentum characterizing the damping in Pb(111)films decays not only much slower in Pb(111)films than in other metal films,and even in films with the thickness up to 40 monolayers the damping still *** slow decay of the surface plasmon damping,manifesting the strong quantum size effect in Pb(111)films,might be related to the strong nesting of the Fermi surface along the(111)direction.

关键词： Pb films plasmons quantum size effects high-resolution electron energy loss spectroscopy

Terahertz time-domain spectroscopy and micro-cavity components for probing samples: a review

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Frontiers of Information Technology & Electronic Engineering 2019年第5期20卷 591-607页

作者： Lin CHEN Deng-gao LIAO Xu-guang GUO Jia-yu ZHAO Yi-ming ZHU Song-lin ZHUANG Shanghai Key Lab of Modern Optical System University of Shanghai for Science and Technology Shanghai 200093 China Shanghai Cooperation Innovation Centre of Terahertz Spectroscopy and Imaging Technology Shanghai 200093 China Cooperative Innovation Center of Terahertz Science University of Electronic Science and Technology Chengdu 611731 China

We give a brief review of the developments in terahertz time-domain spectroscopy(THz-TDS) systems and microcavity components for probing samples in the University of Shanghai for Science and Technology. The broadband terahertz(THz) radiation sources based on GaAs m-i-n diodes have been investigated by applying high electric fields. Then, the free space THz-TDS and fiber-coupled THz-TDS systems produced in our lab and their applications in drug/cancer detection are introduced in detail. To further improve the signal-to-noise ratio(SNR) and enhance sensitivity, we introduce three general micro-cavity approaches to achieve tiny-volume sample detection, summarizing our previous results about their characteristics, performance, and potential applications.

关键词： Terahertz (THz) time-domain spectroscopy Micro-cavity Metal holes array Waveguide cavities Spoof localized surface plasmons (LSPs)