Ideal Polymer‐LC Composite Structure for Terahertz Phase Shifters

Inoue, Y.; Kubo, Hitoshi; Shikada, Tateaki; Moritake, Hiroshi

doi:10.1002/mame.201970011

Macro Materials & Eng

2019

DOI: 10.1002/mame.201970011

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Ideal Polymer‐LC Composite Structure for Terahertz Phase Shifters

Y. Inoue¹,

Hitoshi Kubo²,

Tateaki Shikada³

et al.

Abstract: Back Cover: In article 1800766 by Yo Inoue and co‐workers, an electrically tunable terahertz phase shifter using a polymer structure embedded with liquid crystal droplets is demonstrated. The device exhibits a short response time on the order of tens of milliseconds, while performing a phase shift of 30° for a terahertz wave at a frequency of 0.4 THz.

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Cited by 2 publications

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Evaluation of cutoff characteristics in oscillating liquid crystal molecules under sinusoidal electric fields

Inoue,

Shikada,

Bono

et al. 2024

Appl. Phys. Express

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Sinusoidal electric fields are applied to liquid crystals (LCs) across various frequencies ranging from 0.1 Hz to 10 kHz to investigate the oscillatory behavior of LC directors. In a 1.5-μm-thick 5CB cell, a significant decline in refractive index change occurs in the frequency range greater than 10 Hz, in which the LC director cannot sufficiently follow the rapid fluctuations in field intensity. To evaluate the response speed of the LC under sinusoidal electric fields, the cutoff frequency is introduced as a response indicator. Enhancement to the cutoff frequency can be achieved through conventional fast response techniques such as polymer-stabilized LCs.

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Evaluation of cutoff characteristics in oscillating liquid crystal molecules under sinusoidal electric fields

Inoue,

Shikada,

Bono

et al. 2024

Appl. Phys. Express

Self Cite

View full text Add to dashboard Cite

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Terahertz phase shifter based on phase change material-metasurface composite structure

Long¹,

Li²

2021

Acta Phys. Sin.

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With its rapid development, the terahertz technology is widely used in radar, imaging, remote sensing and data communication. As one of terahertz wave devices, the terahertz phase shifter has become a research hotspot. The existing phase shifters have the disadvantages of large volume, high power consumption and small phase shifting. In the present work, a tunable terahertz phase shifter with liquid crystal and vanadium dioxide is proposed. It is composed of an upper vanadium dioxide embedded metal layer, a liquid crystal, a lower vanadium dioxide embedded metal layer, and a silicon dioxide substrate in sequence from top to bottom. The liquid crystal is sandwiched between the upper and lower vanadium dioxide embedded metal layer. The phase of the device can be controlled by both the phase transition characteristics of vanadium dioxide and the birefringence of liquid crystal. By changing the external applied temperature, the conductivity of vanadium dioxide is changed, and the phase of the device shifts accordingly. Likewise the refractive index of the liquid crystal changes under different externally applied voltages. Finally, the phase of the proposed device can be effectively controlled in a terahertz range by both externally applied temperature and voltage. The phase shift characteristics of the device are analyzed by using software CST studio. The results verify that the terahertz phase shifter can achieve a maximum phase shift of 355.37° at <i>f</i> = 0.736 THz and a phase shift is larger than 350° in a range of 0.731–0.752 THz (bandwidth 22 GHz). Therefore, compared with the traditional phase shifter, this kind of phase change material-metasurface composite structure provides a new idea for flexibly manipulating the terahertz beam. And it is expected to be widely used in terahertz imaging, terahertz wireless and other fields.

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Ideal Polymer‐LC Composite Structure for Terahertz Phase Shifters

Cited by 2 publications

References 0 publications

Evaluation of cutoff characteristics in oscillating liquid crystal molecules under sinusoidal electric fields

Evaluation of cutoff characteristics in oscillating liquid crystal molecules under sinusoidal electric fields

Terahertz phase shifter based on phase change material-metasurface composite structure

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