Intensity-tunable terahertz bandpass filters based on liquid crystal integrated metamaterials

In this paper, we demonstrate an intensity-tunable THz bandpass filter by introducing liquid crystal (LC) integrated with asymmetric frequency selective surface (FSS) and subwavelength metal gratings. Here, the tunable THz filter is derived from the inner polarization state conversion in composited...

Full description

Saved in:
Bibliographic Details
Published in:Applied optics (2004) 2021-10, Vol.60 (30), p.9530
Main Authors: Xu, Shi-Tong, Fan, Fei, Wang, Ying-Hua, Yang, Tengzhou, Cao, Hong-Zhong, Chang, Sheng-Jiang
Format: Article
Language:English
Subjects:
Bandpass filters
Conversion
Electric fields
Electric filters
Frequency selective surfaces
Linear polarization
Liquid crystals
Metamaterials
Multilayers
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In this paper, we demonstrate an intensity-tunable THz bandpass filter by introducing liquid crystal (LC) integrated with asymmetric frequency selective surface (FSS) and subwavelength metal gratings. Here, the tunable THz filter is derived from the inner polarization state conversion in composited devices, and the incident linear polarization can be converted into 90° orthogonal components. By controlling the LC orientation under the applied electric field with the metamaterial electrodes, the polarization conversion process can be actively modulated; thus, the polarization-dependent and tunable THz bandpass filter is achieved. Based on the multilayer design and the inner Fabry–Perot-like resonance mechanism, the LC-integrated metamaterials filter presents better filtering performance than the single FSS filter, and the Q -value is improved from 7.7 to 13.8 at the working frequency. Our simulated work paves the way for the design of new and efficient THz filters.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.439400