Terahertz Polarimetric Sensing for Linear Encoder

Sadamoto, Kota; Tsujita, Wataru; Sawa, Yoshitaka; Wang, B.; Ma, Ruixin; Wang, P.; Teo, Koon Hoo; Orlik, Philip V.; Kato, Koji; Nakajima, Makoto

doi:10.1109/irmmw-thz.2018.8510391

2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) 2018

DOI: 10.1109/irmmw-thz.2018.8510391

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Terahertz Polarimetric Sensing for Linear Encoder

Kota Sadamoto

Wataru Tsujita

Yoshitaka Sawa

et al.

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Cited by 6 publications

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“…A polarization-dependent metamaterial absorber is an ideal building block for polarimetric sensing systems which can equip an inspiring platform for solving some crucial THz challenges such as linear position sensing, security scanning, and medical imaging. 4,5,16 After introducing the first perfect metamaterial absorber (MMA) by Landy et al in 2008, 6 as a counterpart to conventional absorbers, MMAs have become research hotspots and have also been of great attention for solving EM interference challenges, such as the stealth technologies, radar absorbing and thermal emitter. 7 Generally, the maximum absorption is obtained for the normal incidence.…”

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confidence: 99%

Implementation of conformal digital metasurfaces for THz polarimetric sensing

Shabanpour¹,

Beyraghi²,

Ghorbani³

et al. 2021

Preprint

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Monitoring and controlling the state of polarization of electromagnetic waves is of significant interest for various basic and practical applications such as linear position sensing and medical imaging. Here, we propose the first conformal digital metamaterial absorber to detect the polarization state of THz incident waves. The proposed polarimeter is capable of characterizing four independent polarization states of (TE, TM, ±45 • linear, and RCP/LCP) by observing the reflectivity of the structure with respect to the x-and y-direction. Besides, the proposed structure displays a strong absorptivity above 90% up to the incidence angle of 50 • for oblique incident waves with different polarizations. By mere changing the bias voltage of two orthogonal VO2 microwires via two independent computer-programmed multichannel DC network, distinct conditions for reflected waves occurs under excitations of different polarizations, whereby the polarization state of the incident wave may readily be estimated. We believe that the proposed metasurface-based polarimeter can pave the way for polarization detection applications on curved surfaces.

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