Open AccessDeep THz modulation at Fabry-Perot resonances using graphene in periodic microslits
Author(s) -
Xudong Li,
Mingyang Jia,
Shuting Fan,
Rayko I. Stantchev,
Xuequan Chen,
Emma PickwellMacPherson,
Yiwen Sun
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.413622
Subject(s) - terahertz radiation , fabry–pérot interferometer , bandwidth (computing) , optics , modulation (music) , graphene , optoelectronics , frequency modulation , terahertz spectroscopy and technology , materials science , amplitude modulation , physics , telecommunications , laser , computer science , nanotechnology , acoustics
Potential applications of terahertz (THz) radiation are constantly being investigated for high-speed communication due to its large bandwidth. For example, frequency hopping communication technology would benefit from the large bandwidth. To attach the information to the carrier wave, THz modulators with deep and stable modulation at different frequencies are crucial, yet are still lacking. Here a THz modulator, designed by integrating a non-resonant field enhancement effect of periodic metal microslits to assist a Fabry-Perot resonance structure (MS-FP) is proposed and demonstrated. New equations are developed to describe the superior performance of the novel design. The >95% modulation depth is achieved by a SiO 2 /Si gated graphene device at 14 Fabry-Perot resonant frequencies across 1.4 THz bandwidth, outperforming the recently reported 75% modulation depth THz modulator with a similar Fabry-Perot structure.