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Coupling efficiency of lamellar gratings for terahertz quantum-well photodetectors

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Abstract

One-dimensional (1D) etched gratings coated with a perfect metal are used to couple light into terahertz (THz) quantum-well photodetectors (QWPs). The coupling efficiencies of these reflective gratings are simulated by using the finite element method (FEM). The results show that simple optics arguments used in the design of gratings for quantum well infrared detectors (QWIPs) are not suitable in the THz region. The near-field effect is important in the coupling, and a “standing-wave effect” is found in the grating stripes. Optimizations of the gratings are also discussed.

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Authors and Affiliations

  1. Key Laboratory of Terahertz Solid-State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050, China

    R. Zhang, X. G. Guo & J. C. Cao

Authors
  1. R. Zhang
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  2. X. G. Guo
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  3. J. C. Cao
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Correspondence to J. C. Cao.

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Zhang, R., Guo, X.G. & Cao, J.C. Coupling efficiency of lamellar gratings for terahertz quantum-well photodetectors. Journal of the Korean Physical Society 60, 1233–1237 (2012). https://doi.org/10.3938/jkps.60.1233

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  • DOI: https://doi.org/10.3938/jkps.60.1233

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