• 文献标题:   Graphene-based optical phase modulation of waveguide transverse electric modes
  • 文献类型:   Article
  • 作  者:   MIDRIO M, GALLI P, ROMAGNOLI M, KIMERLING LC, MICHEL J
  • 作者关键词:  
  • 出版物名称:   PHOTONICS RESEARCH
  • ISSN:  
  • 通讯作者地址:   CNIT
  • 被引频次:   26
  • DOI:   10.1364/PRJ.2.000A34
  • 出版年:   2014

▎ 摘  要

In this paper we report TE-mode phase modulation obtained by inducing a capacitive charge on graphene layers embedded in the core of a waveguide. There is a biasing regime in which graphene absorption is negligible but large index variations can be achieved with a voltage-length product as small as V pi L pi similar or equal to 0.07 V cm for straight waveguides and V pi L pi similar or equal to 0.0024 V cm for 12 mu m radius microring resonators. This phase modulation device uniquely enables a small signal amplitude <1 V with a micrometer-sized footprint for compatibility with CMOS circuit integration. Examples of phase-induced changes are computed for straight waveguides and for microring resonators, showing the possibility of implementing several optoelectronic functionalities as modulators, tunable filters, and switches. (C) 2014 Chinese Laser Press