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Volume 11
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10.3390/coatings11050578
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Article

Effect of Thicknesses of Liquid Crystal Layers on Shift of Resonance Frequencies of Metamaterials

by
Wei-Fan Chiang
1,
Shih-Xuan Lin
2,
Yong-Xuan Lee
2,
Yu-Han Shih
2,
Jih-Hsin Liu
3,
Harry-Miyosi Silalahi
2,
Chia-Rong Lee
1,* and
Chia-Yi Huang
2,*
1
Department of Photonics, National Cheng Kung University, Tainan 70101, Taiwan
2
Department of Applied Physics, Tunghai University, Taichung 40704, Taiwan
3
Department of Electrical Engineering, Tunghai University, Taichung 40704, Taiwan
*
Authors to whom correspondence should be addressed.
Coatings 2021, 11(5), 578; https://doi.org/10.3390/coatings11050578
Submission received: 14 April 2021 / Revised: 7 May 2021 / Accepted: 12 May 2021 / Published: 15 May 2021
(This article belongs to the Special Issue Advances in Functional Thin Films: Fabrication, Properties, and Applications)
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Abstract

A liquid crystal (LC) layer that is too thick exhibits a small terahertz birefringence due to the limited long-range force of the alignment layers that exert on it. An LC layer that is too thin has a small terahertz birefringence due to its invisibility to incident terahertz waves. Therefore, an LC layer may have a large terahertz birefringence at a specific thickness. It is well known that the birefringence of an LC layer dominates the shift of the resonance frequency of the metamaterial imbedded into the LC layer. As a result, this work studies the effect of the thicknesses of LC layers on the shift of the resonance frequencies of metamaterials. LC layers with various thicknesses ranging from 310 µm to 1487 µm are deposited on terahertz metamaterials, and each of the layers is aligned by two polyimide layers that are rubbed in a direction. The terahertz metamaterials have a maximum frequency shifting range of 21 GHz as 710 µm thick LC layers with mutually orthogonal rubbing directions are deposited on them. The maximum frequency shifting range arises from the competition between the long-range force of the polyimide layers and the interaction between the LC layers and their incident terahertz waves.
Keywords: metamaterials; liquid crystals; terahertz filters metamaterials; liquid crystals; terahertz filters

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MDPI and ACS Style

Chiang, W.-F.; Lin, S.-X.; Lee, Y.-X.; Shih, Y.-H.; Liu, J.-H.; Silalahi, H.-M.; Lee, C.-R.; Huang, C.-Y. Effect of Thicknesses of Liquid Crystal Layers on Shift of Resonance Frequencies of Metamaterials. Coatings 2021, 11, 578. https://doi.org/10.3390/coatings11050578

AMA Style

Chiang W-F, Lin S-X, Lee Y-X, Shih Y-H, Liu J-H, Silalahi H-M, Lee C-R, Huang C-Y. Effect of Thicknesses of Liquid Crystal Layers on Shift of Resonance Frequencies of Metamaterials. Coatings. 2021; 11(5):578. https://doi.org/10.3390/coatings11050578

Chicago/Turabian Style

Chiang, Wei-Fan, Shih-Xuan Lin, Yong-Xuan Lee, Yu-Han Shih, Jih-Hsin Liu, Harry-Miyosi Silalahi, Chia-Rong Lee, and Chia-Yi Huang. 2021. "Effect of Thicknesses of Liquid Crystal Layers on Shift of Resonance Frequencies of Metamaterials" Coatings 11, no. 5: 578. https://doi.org/10.3390/coatings11050578

APA Style

Chiang, W.-F., Lin, S.-X., Lee, Y.-X., Shih, Y.-H., Liu, J.-H., Silalahi, H.-M., Lee, C.-R., & Huang, C.-Y. (2021). Effect of Thicknesses of Liquid Crystal Layers on Shift of Resonance Frequencies of Metamaterials. Coatings, 11(5), 578. https://doi.org/10.3390/coatings11050578

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