• 文献标题:   Tunable Flat-Top Bandpass Filter Based on Coupled Resonators on a Graphene Sheet
  • 文献类型:   Article
  • 作  者:   DENG HD, YAN YQ, XU Y
  • 作者关键词:   graphene waveguide, flattop bandpass filter, tunable filter
  • 出版物名称:   IEEE PHOTONICS TECHNOLOGY LETTERS
  • ISSN:   1041-1135 EI 1941-0174
  • 通讯作者地址:   Jinan Univ
  • 被引频次:   15
  • DOI:   10.1109/LPT.2015.2413363
  • 出版年:   2015

▎ 摘  要

We propose a graphene filter with a tunable flat-top bandpass response. Such a filter consists of two cascaded graphene resonators embedded in a graphene waveguide. The evanescence coupling between two cavities is crucial to realize the flat and bandpass transmission. We numerically demonstrate that the flat-top passband can be electrically tuned over a wide wavelength range in the midinfrared spectrum with sharper roll-off, flatter tops, and better out-of-band rejection compared with the single resonator case. The proposed device is very compact compared with its working wavelength. It might facilitate the tunable signal process in the midinfrared region utilizing graphene.