• 文献标题:   Graphene Electro-Optical Switch Modulator by Adjusting Propagation Length Based on Hybrid Plasmonic Waveguide in Infrared Band
  • 文献类型:   Article
  • 作  者:   CAI M, WANG SL, LIU ZH, WANG YD, HAN T, LIU HX
  • 作者关键词:   plasma modulator, graphene, spp, propagation length, hybrid waveguide
  • 出版物名称:   SENSORS
  • ISSN:  
  • 通讯作者地址:   Xidian Univ
  • 被引频次:   1
  • DOI:   10.3390/s20102864
  • 出版年:   2020

▎ 摘  要

A modulator is the core of many optoelectronic applications such as communication and sensing. However, a traditional modulator can hardly reach high modulation depth. In order to achieve the higher modulation depth, a graphene electro-optical switch modulator is proposed by adjusting propagation length in the near infrared band. The switch modulator is designed based on a hybrid plasmonic waveguide structure, which is comprised of an SiO2 substrate, graphene-Si-graphene heterostructure, Ag nanowire and SiO2 cladding. The propagation length of the hybrid plasmonic waveguide varies from 0.14 mu m to 20.43 mu m by the voltage tunability of graphene in 1550 nm incident light. A modulator with a length of 3 mu m is designed based on the hybrid waveguide and it achieves about 100% modulation depth. The lower energy loss (similar to 1.71 fJ/bit) and larger 3 dB bandwidth (similar to 83.91 GHz) are attractive for its application in a photoelectric integration field. In addition, the excellent robustness (error of modulation effects lower than 8.84%) is practical in the fabrication process. Most importantly, by using the method of adjusting propagation length, other types of graphene modulators can also achieve about 100% modulation depth.