Novel switching of liquid crystals for use in rapid THz phase shifters discovered from the dimensional effects of electrodes

Masahito Oh-e

doi:10.1117/12.2648826

14 March 2023 Novel switching of liquid crystals for use in rapid THz phase shifters discovered from the dimensional effects of electrodes

Masahito Oh-e

Author Affiliations +

Proceedings Volume 12442, Emerging Liquid Crystal Technologies XVIII; 1244202 (2023) https://doi.org/10.1117/12.2648826
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

Liquid Crystal (LC) devices for Terahertz (THz) phase shifters have a thick cell gap, which inevitably results in a very slow response, particularly when they rely on the passive relaxation of LCs. To vastly improve the response characteristics of LCs for use in THz phase shifters, we virtually demonstrate a novel type of LC switching in which all processes are governed by an electric field between in-plane and out-of-plane tristable states, resulting in hexadirectional switching with three orthogonal orientation states and thereby attaining a broader range of phase shifts. This type of LC switching is achieved using a pair of substrates that mirror each other, each of which has two pairs of orthogonally arranged finger-shaped electrodes for in-plane switching. Further, the two substrates each have one grating-shaped electrode, thus forming a pair of electrodes for out-of-plane switching. Each hexadirectional switching process between the tristable states is driven by an electric field, thus maintaining a rapid response by avoiding long relaxation times.

Conference Presentation

Citation Download Citation

Masahito Oh-e "Novel switching of liquid crystals for use in rapid THz phase shifters discovered from the dimensional effects of electrodes", Proc. SPIE 12442, Emerging Liquid Crystal Technologies XVIII, 1244202 (14 March 2023); https://doi.org/10.1117/12.2648826

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