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Kim, Dai-Sik
Nano Optics Group
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Broadband high-performance terahertz polarizer based on a dense array of 5 nm gap slit antennas

Author(s)
Kim, SunghwanKim, DasomLee, YoujinLee, GeonJeong, JeeyoonLee, DukhyungKim, Dai-Sik
Issued Date
2022-08
DOI
10.1364/OE.460859
URI
https://scholarworks.unist.ac.kr/handle/201301/59541
Citation
OPTICS EXPRESS, v.30, no.17, pp.30038 - 30046
Abstract
Critical factors for terahertz polarizers include broadband operation, high transmittance, and a good extinction ratio. In this paper, using a 5 nm-wide metallic slit array with a 200 nm periodicity as a wire grid polarizer, we achieved over 95% transmittance with an average extinction ratio of 40 dB, over the entire spectrum as defined by the terahertz time-domain spectroscopy (0.4 - 2 THz). Theoretical calculations revealed that the slit array can show 100% transmission up to 5 THz, and wider bandwidths with a higher cutoff frequency can be achieved by reducing the slit periodicity. These results provide a novel approach for achieving a broadband THz polarizer and open a new path for seamless integration of the polarizers with nanophotonic applications. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
Publisher
Optica Publishing Group
ISSN
1094-4087
Keyword
FIELD ENHANCEMENTGRID POLARIZERFABRICATIONDESIGNAL

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