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Effect of inhomogeneity and plasmons on terahertz radiation from GaAs (100) surface coated with rough Au film

机译:不均匀性和等离激元对涂有粗糙金膜的GaAs(100)表面太赫兹辐射的影响

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摘要

We measured terahertz (THz) radiation from GaAs (100) surface coated with rough Au film in the thickness ranging from 5 to 21 nm under the incident angle from 0° to 50°. Anomalous THz emission was observed with inhomogeneous crack structures at normal incidence, which originates dominantly from the lateral photo-Dember current. Meanwhile, enhanced THz radiation from Au/GaAs was investigated with the variation of the Au morphology, which confirmed that localized surface plasmons play an important role in the THz radiation. The results indicate the prospect of harnessing surface plasmons for efficient THz emission with controllable morphology of Au on semiconductors.
机译:我们在0°至50°的入射角下测量了覆盖有粗糙Au膜的GaAs(100)表面的太赫兹(THz)辐射,其厚度范围为5至21 nm。垂直入射时观察到具有不均匀裂纹结构的太赫兹发射,其主要起源于横向的光-德伯电流。同时,研究了Au / GaAs增强THz辐射随Au形貌的变化,证实了局部表面等离子体激元在THz辐射中起着重要作用。结果表明利用表面等离子体激元以有效的太赫兹发射和可控的金在半导体上的形态。

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  • 来源
    《Applied Surface Science》 |2013年第ptab期|853-857|共5页
  • 作者单位

    Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

    Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

    Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China,Nanobiophotonic Center, State Key Laboratory for Incubation Base of Photoelectric Technology and Functional Materials, and Institute of Photonics & Photon-Technology, Northwest University, Xi'an 710069, China;

    College of Electronic Engineering and Automatization, Cuilin University of Electronic Technology, Guilin 541004, China;

    Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China;

    Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

    Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Semiconductor surface; THz radiation; Surface plasmon;

    机译:半导体表面;太赫兹辐射表面等离子体激元;

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