TY - JOUR
T1 - Passively tunable terahertz filters using liquid crystal cells coated with metamaterials
AU - Chiang, Wei Fan
AU - Lu, Yu Yun
AU - Chen, Yin Pei
AU - Lin, Xin Yu
AU - Lim, Tsong Shin
AU - Liu, Jih Hsin
AU - Lee, Chia Rong
AU - Huang, Chia Yi
N1 - Funding Information:
Funding: This research was funded by the Ministry of Science and Technology (MOST) of Taiwan under Contract No. MOST 107-2112-M-029-005-MY3.
Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2021/4
Y1 - 2021/4
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85103831619&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85103831619&partnerID=8YFLogxK
U2 - 10.3390/coatings11040381
DO - 10.3390/coatings11040381
M3 - Article
AN - SCOPUS:85103831619
SN - 2079-6412
VL - 11
JO - Coatings
JF - Coatings
IS - 4
M1 - 381
ER -