Passively tunable terahertz filters using liquid crystal cells coated with metamaterials

Wei Fan Chiang, Yu Yun Lu, Yin Pei Chen, Xin Yu Lin, Tsong Shin Lim, Jih Hsin Liu, Chia Rong Lee, Chia Yi Huang

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Liquid crystal (LC) cells that are coated with metamaterials are fabricated in this work. The LC directors in the cells are aligned by rubbed polyimide layers, and make angles θ of 0, 45, and 90 with respect to the gaps of the split-ring resonators (SRRs) of the metamaterials. Experimental results display that the resonance frequencies of the metamaterials in these cells increase with an increase in θ, and the cells have a maximum frequency shifting region of 18 GHz. Simulated results reveal that the increase in the resonance frequencies arises from the birefringence of the LC, and the LC has a birefringence of 0.15 in the terahertz region. The resonance frequencies of the metamaterials are shifted by the rubbing directions of the polyimide layers, so the LC cells coated with the metamaterials are passively tunable terahertz filters. The passively tunable terahertz filters exhibit promising applications on terahertz communication, terahertz sensing, and terahertz imaging.

Original languageEnglish
Article number381
Issue number4
Publication statusPublished - 2021 Apr

All Science Journal Classification (ASJC) codes

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


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