Broadband large-modulation-depth low-current-triggered terahertz intensity modulator based on VO2 embedded hybrid metamaterials. (24th August 2018)

• Record Type: Journal Article
• Authors: Hu, Fangrong; Li, Yuanyuan; Xu, Xinlong; Zhou, Yuan; Chen, Ying; Zhu, Peidong; Zhao, Shuai; Jiang, Wenying; Zhang, Wentao; Han, Jiaguang; Chen, Yuanzhi
• Is Part Of: Applied physics express. Volume 11:Number 9(2018)
• Publication Date: 2018-08-24
• Subjects: Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.7567/APEX.11.092004
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: We experimentally demonstrate a broadband terahertz (THz) intensity modulator operating at low current and frequency range. The modulator consists of VO2 and meander–wire hybrid metamaterials. The measured 3-dB bandwidth for normal incidence is 0.5 THz, while the maximum modulation depth of 99% is achieved at 0.28 A. The physical mechanism of the device's electrical tunability is attributed to an ohmic-heating-induced transition. An equivalent circuit model is proposed for the upper cut-off frequency. This scheme paves the way for a full electric control of the intensity of a THz wave at a broad band, low current, and low frequency range.