Effect of thicknesses of liquid crystal layers on shift of resonance frequencies of metamaterials

Wei Fan Chiang, Shih Xuan Lin, Yong Xuan Lee, Yu Han Shih, Jih Hsin Liu, Harry Miyosi Silalahi, Chia Rong Lee, Chia Yi Huang

Research output: Contribution to journalArticlepeer-review


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 bire-fringence of an LC layer dominates the shift of the resonance frequency of the metamaterial imbed-ded 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 competi-tion between the long-range force of the polyimide layers and the interaction between the LC layers and their incident terahertz waves.

Original languageEnglish
Article number578
Issue number5
Publication statusPublished - 2021 Oct 15

All Science Journal Classification (ASJC) codes

  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry


Dive into the research topics of 'Effect of thicknesses of liquid crystal layers on shift of resonance frequencies of metamaterials'. Together they form a unique fingerprint.

Cite this