We propose a highly efficient graphene-on-gap modulator (GOGM) by employing the hybrid plasmonic effect, whose modulation efficiency (up to 1.23 dB/μm after optimization) is -fold larger than that of the present graphene-on-silicon modulator (). The proposed modulator has the advantage of a short modulation length of , a relatively low insertion loss of , and a larger modulation bandwidth of . The physical insight is investigated, showing that both the slow light effect and the overlap between graphene and the mode field contribute. Moreover, an efficient taper coupler has been designed to convert the quasi-transverse electric mode of conventional silicon waveguide to the hybrid plasmonic mode of GOGM, with a high coupling efficiency of 91%. This Letter may promote the design of high-performance on-chip electro-optical modulators.
© 2017 Optical Society of AmericaFull Article | PDF Article
24 April 2017: A correction was made to the author listing.
OSA Recommended Articles
Bao-Hu Huang, Wei-Bing Lu, Xiao-Bing Li, Jian Wang, and Zhen-guo Liu
Appl. Opt. 55(21) 5598-5602 (2016)
Zhongwei Wu and Yin Xu
Appl. Opt. 57(12) 3260-3267 (2018)
Rubab Amin, Zhizhen Ma, Rishi Maiti, Sikandar Khan, Jacob B. Khurgin, Hamed Dalir, and Volker J. Sorger
Appl. Opt. 57(18) D130-D140 (2018)