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|Title:||Ultra-wideband tri-layer transmissive linear polarization converter for terahertz waves|
|Citation:||APL Photonics, 2020; 5(4):046101-1-046101-7|
|Rajour Tanyi Ako, Wendy S.L. Lee, Shaghik Atakaramians, Madhu Bhaskaran, Sharath Sriram, and Withawat Withayachumnankul|
|Abstract:||Polarization control is shown to enhance functionalities of terahertz waves in various applications. As a step toward introducing efficient practical devices operating in the terahertz band, we propose and experimentally validate a free-standing three-layer polarization converter operating in transmission. The device can efficiently convert a linearly polarized terahertz wave to its orthogonal counterpart. Our device comprises split-ring and H-shaped resonators inserted between two layers of orthogonal wire gratings. The sole dielectric material is a cyclic olefin copolymer (COC) that has exceptionally low-loss to terahertz waves. The measurement demonstrates a conversion efficiency of >80%, over 0.2–1.0 THz, giving an ultra-wide bandwidth of 133%. The wide bandwidth is attributed to multiple resonances of the two resonators in a unit cell. Importantly, an unconventional fabrication process yields a multi-layer low-loss COC that leads to high efficiency. The proposed design can also be tailored for practical applications across the electromagnetic spectrum.|
|Rights:||© 2020 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). https://doi.org/10.1063/1.5144115.,|
|Appears in Collections:||Electrical and Electronic Engineering publications|
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