Wideband circular polarizer for a photoconductive antenna

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

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Detail(s)

Original languageEnglish
Pages (from-to)3223-3226
Journal / PublicationOptics Letters
Volume48
Issue number12
Online published9 Jun 2023
Publication statusPublished - 15 Jun 2023

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DOI

DOI
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Link to Scopus https://www.scopus.com/record/display.uri?eid=2-s2.0-85163905077&origin=recordpage
Permanent Link https://scholars.cityu.edu.hk/en/publications/publication(6d093efb-b69d-4d6f-a2dd-5abb7dfc7332).html

Abstract

We report a thin-film circular polarizer consisting of three metal-grid layers to be used with a photoconductive antenna (PCA) to generate terahertz (THz) circularly polarized (CP) radiation. The polarizer has a high transmission with a measured 3 dB axial-ratio bandwidth of 54.7% from 0.57 to 1 THz. We further developed a generalized scattering matrix approach to provide insight into the underlying physical mechanism of the polarizer. We revealed that the Fabry-Pérot-like multi-reflection among gratings enables the high-efficiency polarization conversion. The successful realization of the CP PCA can find widespread application, such as THz circular dichroism spectroscopy, THz Mueller imaging, and ultrahigh-speed THz wireless communications.

© 2023 Optica Publishing Group

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Publication fingerprints text

100
antennas INIS
100
Terahertz Keyphrases
100
Wideband Keyphrases
100
Photoconductive Ant... Keyphrases
100
Circular Polarizer Keyphrases
100
Polarizer Material Science
33
speed INIS
33
metals INIS
33
reflection INIS
33
polarization INIS
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Citation Format(s)

[ RIS ] [ BibTeX ]
Wideband circular polarizer for a photoconductive antenna. / Bundel, Pooja; Wu, Geng-Bo; Chen, Bao-Jie et al.
In: Optics Letters, Vol. 48, No. 12, 15.06.2023, p. 3223-3226.

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review