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Sandwich nano-fin to reduce the aspect ratio requirement of metasurface

  • Special Section: Regular Paper
  • The 13th International Conference on Optics-Photonics Design & Fabrication (ODF’22), Sapporo, Japan
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Abstract

The current high-aspect-ratio Pancharatnam–Berry (PB)-phase metasurfaces in which vertical dimensions are much larger than the lateral dimensions are challenging to fabricate. Therefore, reducing the aspect ratio requirement has become a research priority. We propose a sandwich nano-fin consisting of GaN/amorphous silicon (a-Si)/GaN on a silica substrate to reduce the strict aspect ratio requirement of current PB-phase metasurfaces. The phase modulation ability and polarization conversion efficiency (PCE) of sandwich nano-fins were investigated. Compared with a conventional GaN nano-fin, the aspect ratio of sandwich nano-fin decreased from 6 to 4 under the same geometric dimension. The PCE of the sandwich nano-fin was up to 68.27%, 1.5 times higher than that of a GaN nano-fin under the same aspect ratio of 4. Moreover, after adding the a-Si layer, the overall PCE improved from 32.17 to 40.54% for the sandwich nano-fin. The sandwich structure simultaneously reduces the challenge of manufacturing and improves efficiency compared to current PB-phase metasurfaces.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Acknowledgements

The authors would like to acknowledge financial support from the Ministry of Science and Technology, Taiwan (grant no. Grant Nos. MOST 110-2124-M-008-002 and 110-2221-E-008-060-MY3).

Funding

This study was supported by Ministry of Science and Technology, Taiwan (Grant Nos. MOST 110-2124-M-008-002 and 110-2221-E-008-060-MY3).

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Authors and Affiliations

  1. Department of Optics and Photonics, National Central University, Taoyuan, 32001, Taiwan

    Wei-Lun Hsu, Chen-Yi Yu, Hao-Ting Lai, Yen-Chun Chen & Chih-Ming Wang

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  1. Wei-Lun Hsu
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Correspondence to Chih-Ming Wang.

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Hsu, WL., Yu, CY., Lai, HT. et al. Sandwich nano-fin to reduce the aspect ratio requirement of metasurface. Opt Rev 30, 134–140 (2023). https://doi.org/10.1007/s10043-022-00782-9

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