title: Tunable Band-Stop Filters for Graphene Plasmons Based on Periodically Modulated Graphene.
abstract: Tunable band-stop filters based on graphene with periodically modulated chemical potentials are proposed. Periodic graphene can be considered as a plasmonic crystal. Its energy band diagram is analyzed, which clearly shows a blue shift of the forbidden band with increasing chemical potential. Structural design and optimization are performed by an effective-index-based transfer matrix method, which is confirmed by numerical simulations. The center frequency of the filter can be tuned in a range from 37 to 53 THz based on the electrical tunability of graphene, while the modulation depth (-26 dB) and the bandwidth (3.1 THz) of the filter remain unchanged. Specifically, the bandwidth and modulation depth of the filters can be flexibly preset by adjusting the chemical potential ratio and the period number. The length of the filter (~750 nm) is only 1/9 of the operating wavelength in vacuum, which makes the filter a good choice for compact on-chip applications.
authors.affiliation: The MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Applied Physics Institute and School of Physics, Nankai University, Tianjin 300457, China.|Synergetic Innovation Center of Chemical Science and Engineering, Tianjin 300071, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Shi
authors.affiliation: The MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Applied Physics Institute and School of Physics, Nankai University, Tianjin 300457, China.|Synergetic Innovation Center of Chemical Science and Engineering, Tianjin 300071, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Cai
authors.affiliation: The MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Applied Physics Institute and School of Physics, Nankai University, Tianjin 300457, China.|Synergetic Innovation Center of Chemical Science and Engineering, Tianjin 300071, China.
authors.forename: Xinzheng
authors.initials: X
authors.lastname: Zhang
authors.affiliation: The MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Applied Physics Institute and School of Physics, Nankai University, Tianjin 300457, China.|Synergetic Innovation Center of Chemical Science and Engineering, Tianjin 300071, China.
authors.forename: Yinxiao
authors.initials: Y
authors.lastname: Xiang
authors.affiliation: The MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Applied Physics Institute and School of Physics, Nankai University, Tianjin 300457, China.|Synergetic Innovation Center of Chemical Science and Engineering, Tianjin 300071, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhan
authors.affiliation: The MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Applied Physics Institute and School of Physics, Nankai University, Tianjin 300457, China.|Synergetic Innovation Center of Chemical Science and Engineering, Tianjin 300071, China.
authors.forename: Juan
authors.initials: J
authors.lastname: Geng
authors.affiliation: The MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Applied Physics Institute and School of Physics, Nankai University, Tianjin 300457, China.|Synergetic Innovation Center of Chemical Science and Engineering, Tianjin 300071, China.
authors.forename: Mengxin
authors.initials: M
authors.lastname: Ren
authors.affiliation: The MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Applied Physics Institute and School of Physics, Nankai University, Tianjin 300457, China.|Synergetic Innovation Center of Chemical Science and Engineering, Tianjin 300071, China.
authors.forename: Jingjun
authors.initials: J
authors.lastname: Xu