Journal
APPLIED PHYSICS LETTERS
Volume 110, Issue 23, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4985132
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Funding
- National Natural Science Foundation of China [61625502, 61574127, 61601408]
- ZJNSF [LY17F010008]
- Postdoctoral Science Foundation of China [2015M581930]
- Top-Notch Young Talents Program of China
- Fundamental Research Funds for the Central Universities [2017XZZX008-06]
- Innovation Joint Research Center for Cyber-Physical-Society System
- Office of Naval Research [N00014-16-1-2049]
- Samsung Global Research Outreach (GRO) Program
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Chiral metamirrors are recently proposed metadevices that have the ability of selective reflection for the designated circularly polarized waves. However, previous chiral metamirrors only work in a narrow band, which would limit their potential applications in engineering. Here, we propose an approach towards broadband spin-selective absorption. By combining the chiral resonant modes of two asymmetric split-ring resonators, we design and construct a chiral metamirror that absorbs only the left-handed circularly waves over a broad frequency range. The measured results show a bandwidth of 5.1%, almost 96% larger than that of the narrowband metamirror. Furthermore, the proposed chiral metamirror exhibits prominent performance at oblique incidence, even when high-order diffraction appears. The total thickness of the metamirror is only one-ninth of the wavelength, highly suitable for on-chip integration. Our findings may provide an efficient approach to boost the working bandwidth of the chiral metamirror and could advance its applications in optical instruments. Published by AIP Publishing.
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