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Antireflection Coatings on Au Plasmonic Gratings for Infrared Photodetection

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Abstract

Based on analytic formulas and numerical simulations, we investigate the enhancement effect of dielectric antireflection coatings on the performance of quantum-well infrared photodetectors (QWIP) with Au grating couplers and operating at 15 μm. It is found that a simple analytic formula can well estimate the optimal coating thickness. By using a GaAs-coated Au grating with optimal parameters, the absorption can be enhanced by 13 times in the QW active region compared with the reference structure (without Au grating and with an isotropic active region). This enhancement is about three times of that without a dielectric coating. For s-polarized light, a high enhancement (>5) can occur in a broad range of incident angle (|𝜃|<60∘).

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Acknowledgments

This work was supported by the 973 Program (Grant Nos 2013CB632701 and 2012CB921604) and the NSFC (No. 61422504).

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Authors and Affiliations

  1. Department of Materials Science, Key Laboratory of Micro- and Nano-Photonic Structures (Ministry of Education), and Laboratory of Advanced Materials, Fudan University, Shanghai, 200433, China

    Huiting Chang, Chi Zhang, Fangyuan Zhao & Xinhua Hu

  2. Department of Physics and Key Laboratory of Surface Physics, Fudan University, Shanghai, 200433, China

    Fangyuan Zhao

Authors
  1. Huiting Chang
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  2. Chi Zhang
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  3. Fangyuan Zhao
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  4. Xinhua Hu
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Correspondence to Xinhua Hu.

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Chang, H., Zhang, C., Zhao, F. et al. Antireflection Coatings on Au Plasmonic Gratings for Infrared Photodetection. Plasmonics 10, 1519–1524 (2015). https://doi.org/10.1007/s11468-015-9961-y

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  • DOI: https://doi.org/10.1007/s11468-015-9961-y

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