4.7 Article

Gap-plasmon-driven spin angular momentum selection of chiral metasurfaces for intensity-tunable metaholography working at visible frequencies

期刊

NANOPHOTONICS
卷 11, 期 17, 页码 4123-4133

出版社

WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2022-0075

关键词

chiral plasmonics; chirality; metahologram; metasurface; tunable metasurface

资金

  1. POSCO-POSTECH-RIST Convergence Research Center program - POSCO
  2. LGD-SNU incubation program - LG Display
  3. National Research Foundation (NRF) [NRF-2021M3H4A1A04086554, CAMM-2019M3A6B3030637]
  4. Hyundai Motor Chung Mong-Koo fellowship
  5. NRF fellowship - Ministry of Education, Republic of Korea [NRF-2021R1A6A3A13038935]
  6. POSTECH Alchemist fellowship

向作者/读者索取更多资源

Tunable metasurfaces have the potential to replace bulky active optical modules and enable practical flat optical devices. This study presents liquid crystal integrated chiral metasurfaces that can continuously adjust the intensity of metaholograms. The proposed LC integrated spin-selective chiral metasurface provides a new resource for the development of compact active optical modules with continuously tunable intensity.
Tunable metasurfaces can replace conventional bulky active optical modules to realize practical flat optical devices such as lenses, LiDAR, holography, and augmented reality. However, tunable metasurfaces have generally been limited to switching between two distinct states. Here, we present liquid crystal (LC) integrated chiral metasurfaces, of which the metahologram intensity can be adjusted continuously between fully 'on' and 'off' states. The chiral metasurface consists of a gap-shifted split ring resonator (SRR), and exhibits spin angular momentum selection that reflects left-circularly-polarized light but perfectly absorbs right-circularly-polarized light (99.9%). The gap-shifted SRR realizes spin angular momentum selection using a metal-dielectric-metal multilayer structure and thereby induces a strong gap-plasmonic response, achieving the maximum calculated circular dichroism in reflection (CDR) of 0.99 at the wavelength of 635 nm. With the chiral metasurface, metaholograms are demonstrated with tunable intensities using LCs that change the polarization state of the output light using an applied voltage. With the LC integrated chiral metasurfaces, 23 steps of polarization are demonstrated for the continuous tuning of the holographic image intensity, achieving measured CDR of 0.91. The proposed LC integrated spin-selective chiral metasurface provides a new resource for development of compact active optical modules with continuously-tunable intensity.

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