Journal
APPLIED PHYSICS EXPRESS
Volume 11, Issue 9, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.7567/APEX.11.092004
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Funding
- National Natural Science Foundation of China [11574059, 61565004, 11774288]
- National Technology Major Special Project [2017ZX02101007-003]
- Natural Science Foundation of Guangxi [2015GXNSFDA139039, 2017GXNSFBA198116]
- Guangxi Key Laboratory of Automatic Detection Technology and Instrument [YQ14114, YQ17109]
- Innovation Project of Guangxi Graduate Education, China [2018YJCX70, 2018YJCX67, 2018YJCX74]
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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. (C) 2018 The Japan Society of Applied Physics
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