期刊
NANO LETTERS
卷 17, 期 4, 页码 2603-2610出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b00401
关键词
Terahertz (THz); GaAs; nanowire; parylene; polarizer; modulator
类别
资金
- EPSRC (U.K.)
- Australian Research Council
- Royal Commission
- Engineering and Physical Sciences Research Council [EP/M017095/1, 1362014] Funding Source: researchfish
- EPSRC [EP/M017095/1] Funding Source: UKRI
Progress in the terahertz (THz) region of the electromagnetic spectrum is undergoing major advances, with advanced THz sources and detectors being developed at a rapid pace. Yet, ultrafast THz communication is still to be realized, owing to the lack of practical and effective THz modulators. Here, we present a novel ultrafast active THz polarization modulator based on GaAs semiconductor nanowires arranged in a wire-grid configuration. We utilize an optical pump-terahertz probe spectroscopy system and vary the polarization of the optical pump beam to demonstrate ultrafast THz modulation with a switching time of less than 5 ps and a modulation depth of -8 dB. We achieve an extinction of over 13% and a dynamic range of -9 dB, comparable to microsecond-switchable graphene- and metamaterial-based THz modulators, and surpassing the performance of optically switchable carbon nanotube THz polarizers. We show a broad bandwidth for THz modulation between 0.1 and 4 THz. Thus, this work presents the first THz modulator which combines not only a large modulation depth but also a broad bandwidth and picosecond time resolution for THz intensity and phase modulation, making it an ideal candidate for ultrafast THz communication.
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