• 文献标题:   High-performance integrated graphene electro-optic modulator at cryogenic temperature
  • 文献类型:   Article
  • 作  者:   LEE BS, KIM B, FREITAS AP, MOHANTY A, ZHU YB, BHATT GR, HONE J, LIPSON M
  • 作者关键词:   2d material, cryogenic, graphene, modulator, ring resonator, silicon photonic
  • 出版物名称:   NANOPHOTONICS
  • ISSN:   2192-8606 EI 2192-8614
  • 通讯作者地址:  
  • 被引频次:   18
  • DOI:   10.1515/nanoph-2020-0363
  • 出版年:   2021

▎ 摘  要

High-performance integrated electro-optic modulators operating at low temperature are critical for optical interconnects in cryogenic applications. Existing integrated modulators, however, suffer from reduced modulation efficiency or bandwidth at low temperatures because they rely on tuning mechanisms that degrade with decreasing temperature. Graphene modulators are a promising alternative because graphene's intrinsic carrier mobility increases at low temperature. Here, we demonstrate an integrated graphene-based electro-optic modulator whose 14.7 GHz bandwidth at 4.9 K exceeds the room temperature bandwidth of 12.6 GHz. The bandwidth of the modulator is limited only by high contact resistance, and its intrinsic RC-limited bandwidth is 200 GHz at 4.9 K.