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The　photon　theory　hypothesis　about　photon　tunneling　microscope＇s　subwavelength　resolution

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光电子·激光 1996年第4期7卷 236-239+259页

作者： Yanbin Zhu Junfu Ma(Laser Li fe Science Institute, South China Normal University, Guangzhou 510631,P.R.China) 华南师范大学激光生命科学所广东广州

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关键词： tunneling hypothesis microscope about resolution subwavelength theory The photon

Ultracompact bandwidth-tunable filter based on subwavelength grating-assisted contra-directional couplers

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Frontiers of Optoelectronics 2021年第3期14卷 374-380页

作者： Kangnian WANG Yuan WANG Xuhan GUO Yong ZHANG An HE Yikai SU State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China

An ultracompact,bandwidth-tunable filter has been demonstrated using a silicon-on-insulator(SOI)*** device is based on cascaded grating-assisted contra-directional couplers(GACDCs).It also involves the use of a subwavelength grating(SWG)*** heating one of the heaters on GACDCs,a bandwidth tunability of~6 nm is *** to the benefit of having a large coupling coefficient between SWG and strip waveguides,the length of the coupling region is only 100 ***,the combination of the curved SWG and the tapered strip waveguides effectively suppresses the *** filter possesses features of simultaneous wavelength tuning with no free spectral range(FSR)limitation.A maximum bandwidth of 10 nm was experimentally measured with a high out-of-band contrast of 25 ***,the minimum bandwidth recorded is 4 nm with an out-of-band contrast of 15 dB.

关键词： silicon-based devices tunable filter subwavelength grating waveguide grating-assisted contra-directional coupler(GACDC)

Low-power nonlinear enhanced electromagnetic transmission of a subwavelength metallic aperture

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Photonics Research 2018年第12期6卷 1102-1106页

作者： YUNSHENG GUO SAIYU LIU KE BI MING LEI JI ZHOU Department of Applied Physics Inner Mongolia University of Science & Technology State Key Laboratory of Information Photonics and Optical Communications & School of Science Beijing University of Posts and Telecommunications State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University

When a dielectric meta-atom is placed into a subwavelength metallic aperture, 20-fold enhanced electromagnetic transmission through the aperture is realized at the meta-atom's resonant frequency. Additionally, when the incident electromagnetic power increases, thermal energy gathered by the meta-atom, which is converted from electromagnetic losses, can cause the meta-atom's temperature to increase. Because of the high temperature coefficient of the meta-atom's resonant frequency, this temperature increase causes a blueshift in the transmission peak. Therefore, this frequency-dependent enhanced electromagnetic transmission even produces a nonlinear effect at low incident powers. Over an incident power range from 0 to 20 dBm, measured and simulated spectra near the meta-atom's resonant frequency show distinctly nonlinear transmission.

关键词： subwavelength metal aperture Electromagnetic power Resonance frequency

Three-Dimensional Planar Metallic Lenses Based on Concentric Rings with Modulated subwavelength Width

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Journal of Electromagnetic Analysis and Applications 2012年第12期4卷 485-491页

作者： Di Feng Chunxi Zhang Lishuang Feng Yuanhong Yang School of Instrumentation Science and Optoelectronics Engineering Beihang University Beijing China

A kind of subwavelength Planar Metallic Lenses (SPMLs) is proposed to realize far-field optical focusing in the visible range based on concentric rings with modulated width in a silver film. The width of each metallic ring is mutative so that the radiation fields of surface plasmon polaritons can be controlled and the relevant phase retardations can be modulated to make a beam focus at the desired position. For comparison, the subwavelength Planar Dielectric Lenses (SPDLs) structured on silica glass with the same concentric ring shapes as SPMLs are analyzed, although without opaque metal coating on SPDLs, the computational results show that SPMLs can support higher intensity focal spot, narrower full-width half-maximum beam width, and longer depth of focus at the focal region under certain lens thickness due to the coupling of surface plasomon polaritons, diffracted evanescent waves and propagated electromagnetic waves.

关键词： subwavelength Structures Focus Surface Plasmons Diffractive Lenses

Recent advancements in surface plasmon polaritons-plasmonics subwavelength structures in microwave and terahertz regimes

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Digital Communications and Networks 2018年第4期4卷 244-257页

作者： Rana Sadaf Anwar Huansheng Ning Lingfeng Mao School of Computer and Communication Engineering University of Science and Technology BeijingBeijing100083China

This paper presents a review of recent investigational studies on exciting Surface Plasmon Polaritous (SPPs)in MicroWave (MW)and TeraHertZ (THz)regimes by using subwavelength corrugated patterns on conductive or metal *** article also describes SPP Microstrip (MS)structures at microwave and terahertz frequencies, and compares their significance with that of conventional MS Transmission Lines (TL),in order to tackle the key challenges of high gain,bandwidth size,compactness,TL losses,and signal integrity in high-end electronic de- *** they have subwavelength properties,surface plasmon polaritous are gaining attention for their improved performance and ability for miniaturization in high-speed dense *** possess comparably minuscule wavelength compared to incident light (photons).Consequently,they can demonstrate stronger spatial confinement and higher local field intensity at optical *** addition to engineering spoof SPP waveguides,which are created by engraving grooves and slits on metal surfaces to allow operation on at low frequencies (microwave and terahertz),semiconductors with smaller permittivity values and thus lower free charge carrier concentration have been demonstrated as a potential candidate in plasmonic *** necessary,further tuning of semiconductor-based SPP structures is aided by controlling the charge carrier concentration through doping,or by external stimuli such as optical illumination or thermal excitation of charge carriers from valence to conduction *** article conclusively covers previously elucidated perspectives on manipulating SSPPs in the MW and THz ranges,and emphasizes how these could steer next-generation plasmonic devices.

关键词： Surface Plasmons subwavelength Metamaterials Plasmonics Terahertz Microwave

Reduced graphene oxide@carbon sphere based metacomposites for temperature-insensitive and efficient microwave absorption

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Nano Research 2022年第9期15卷 8546-8554页

作者： Zhiyang Jiang Haoxu Si Yi Li Dan Li Huihui Chen Chunhong Gong Jingwei Zhang Institute of Functional Polymer Composites College of Chemistry and Chemical EngineeringHenan UniversityKaifeng 475004China National&Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials Henan UniversityKaifeng 475004China

With the increasing advance of fifth generation(5G)network and the gradual expansion of digital devices,harsh working environment for electronic devices has spawned higher requirements for microwave absorbing materials(MAMs).Since both the electromagnetic response and energy conversion character vary with temperature,to achieve temperature insensitive microwave absorption behaviour in wide temperature range has become extremely *** this work,structured metacomposites containing sub-wavelength reduced graphene oxide(RGO)@carbon spheres were fabricated,and the microwave absorption was further improved through structural and composition design of the RGO@carbon *** to the unique anti-reflection effect on microwave of the metacomposites,the temperature-insensitive electromagnetic performance at elevated temperature could be ***,both the dielectric relaxation behaviour and microwave absorption proformance of the system could be further *** a result,the effective absorption bandwidth(reflection loss(RL)<−10 dB)of the metacomposites with only 3.0 wt.%filler content could cover the entire X-band(8.2–12.4 GHz)frequency ranging from 298 to *** metacomposite proposed in this work provides a“de-correlating”strategy to break the linkage between microwave absorption behaviour and temperature,which offers an interesting plateau for fabricating efficient high-temperature microwave absorption structures with tunable and designable advantages.

关键词： metacomposites subwavelength functional units temperature-insensitive microwave absorption

Engineering the near-field imaging of a rectangular-lattice photonic-crystal slab in the second band

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Science China(Physics,Mechanics & Astronomy) 2009年第1期52卷 87-91页

作者： FENG Shuai AO Ling WANG YiQuan College of science Central University for NationalitiesBeijing 100081China

Imaging properties of a two-dimensional rectangular-lattice photonic crystal (PC) slab consisting of air holes immersed in a dielectric are studied in this work. The field patterns of electromagnetic waves radiated from a point source through the PC slab are calculated with the finite-difference time-domain method. Comparing the field patterns with the corresponding equifrequency-surface contours simulated by the plane-wave expansion method, we find that an excellent-quality near-field image may be formed through the PC slab by the mechanisms of the simultaneous action of the self-collimation effect and the negative-refraction effect. Near-field imaging may be obtained within two different frequency regions in two vertical directions of the PC slab.

关键词： photonic crystal negative refraction subwavelength imaging

Control amplitude and phase of light by plasmonic meta-hologram with T-shaped nano-cavity

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Chinese Optics Letters 2019年第6期17卷 92-97页

作者：宋伟郑闪光付亚男闵长俊张聿全谢振威袁小聪 Nanophotonics Research Center Shenzhen Key Laboratory of Micro-Scale Optical Information TechnologyShenzhen University

Controlling both amplitude and phase of light in the subwavelength scale is a challenge for traditional optical ***,we propose and numerically investigate a novel plasmonic meta-hologram,demonstrating broadband manipulation of both phase and amplitude in the subwavelength *** the meta-hologram,phase modulation is achieved by the detour phase distribution of unit cells,and amplitude is continuously modulated by a T-shaped nano-cavity with tunable plasmonic *** to phase-only holograms,such a metahologram could reconstruct three-dimensional(3D)images with higher signal-to-noise ratio and better image quality,thus offering great potential in applications such as 3D displays,optical communications,and beam shaping.

关键词： Controlling both amplitude subwavelength scale beam shaping