基于金属布拉格光栅结构的太赫兹平板波导模态约束无色散特性分析

IF 4.4 2区 物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Borwen You , Che-Chu Hsieh , Ryuji Iwasa , Hung-Yi Tsai , Yen-Shan Lin , Liang-Cheng Yu , Pin-Jung Lu , Shiun-Yun Chang , Yuan-Chi Wu
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引用次数: 0

摘要

使用周期性金属沟槽和周期性穿孔金属狭缝(PPMS)的光子波导结构,可以在太赫兹(THz)区域利用金属间隙间的电场积累横向约束金属的索默费尔德和齐内克表面波,而不是介质板状介质的全内反射原理。为了提高太赫兹波耦合和板-波导约束的效率,需要具有高折射率或指定横向磁偏振波输入角的特定积分器,如棱镜、金属叶片和波导,以激发太赫兹区域的欺骗性表面质子。然而,积分器组装的板状波导在紧凑和低失真系统中进行太赫兹脉冲波通信时遇到了挑战。实验证明,基于 PPMS 的谐振波导光栅结构可以限制自由空间平面波辐射中的太赫兹横向波。PPMS 的开放式框架和周期性金属空腔可作为板状波导,传输具有法布里-佩罗共振前向蒸发波的结构约束波导模式。对于 0.1-1 太赫兹波,小于金属狭缝宽度一半和金属厚度 3.75 倍的短波长可导致零色散,并使 PPMS 限制的太赫兹波在板状波导中具有最高的限制因子。这种行为与表面等离子器件在约束太赫兹波中的高结构色散相反。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Dispersion-free characterization of terahertz slab–waveguide modal confinement based on a metal Bragg grating structure
Photonic waveguide structures that use periodic metal grooves and periodically perforated metal slits (PPMSs) can laterally confine Sommerfeld and Zenneck surface waves of metals with the electric field accumulation among metal interspaces in the terahertz (THz) region, instead of the total internal reflection principle of dielectric slab media. For the efficiency enhancements of THz-wave coupling and slab–waveguide confinement, specific integrators with high refractive indices or specified for input angles of transverse magnetic polarized waves, such as prisms, metal blades, and waveguides, are requested to excite spoof surface plasmons in the THz region. However, the integrator-assembled slab–waveguides encounter challenges of THz pulse-wave communication in compact and low-distortion systems. A resonant waveguide grating structure based on PPMSs is experimentally demonstrated to confine THz lateral waves from the plane-wave radiation in free space. The open frame and periodic metal cavities of PPMSs can work as a slab–waveguide to transmit structural confined waveguide modes with forwarding evanescent waves of Fabry–Pérot resonance. For 0.1–1 THz waves, the short wavelengths that are both less than half the metal slit width and 3.75 times the metal thickness can lead to zero dispersion and the highest confinement factor in a slab–waveguide for PPMS-confined THz waves. This behavior is opposite to the high structural dispersion in confined THz waves of surface plasmonic devices.
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来源期刊
Results in Physics
Results in Physics MATERIALS SCIENCE, MULTIDISCIPLINARYPHYSIC-PHYSICS, MULTIDISCIPLINARY
CiteScore
8.70
自引率
9.40%
发文量
754
审稿时长
50 days
期刊介绍: Results in Physics is an open access journal offering authors the opportunity to publish in all fundamental and interdisciplinary areas of physics, materials science, and applied physics. Papers of a theoretical, computational, and experimental nature are all welcome. Results in Physics accepts papers that are scientifically sound, technically correct and provide valuable new knowledge to the physics community. Topics such as three-dimensional flow and magnetohydrodynamics are not within the scope of Results in Physics. Results in Physics welcomes three types of papers: 1. Full research papers 2. Microarticles: very short papers, no longer than two pages. They may consist of a single, but well-described piece of information, such as: - Data and/or a plot plus a description - Description of a new method or instrumentation - Negative results - Concept or design study 3. Letters to the Editor: Letters discussing a recent article published in Results in Physics are welcome. These are objective, constructive, or educational critiques of papers published in Results in Physics. Accepted letters will be sent to the author of the original paper for a response. Each letter and response is published together. Letters should be received within 8 weeks of the article''s publication. They should not exceed 750 words of text and 10 references.
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