Abstract
We propose a novel plasmonic Bragg reflector (PBR) based on graphene with multiple-step silicon structure. The monolayer graphene bears locally variable optical properties by modulation of electric fields, and the periodical change of effective refractive index on graphene can be obtained by external bias voltage in the mid-infrared region. Through patterning the PBR units into multiple-step structures, we can decrease the insertion loss and suppress the rippling in transmission spectra. By introducing the defect into the multiple-step PBRs, the multiple resonance modes are formed inside the stopband by increasing the step number. This work may pave the ways for the further development of ultra-compact low-cost hyperspectral sensors in the mid-infrared region.
Highlights
Graphene has become a popular research field and has attracted an increasing amount of attention [1]
The tunable plasmonic Bragg reflectors based on graphene silicon waveguide have been presented and studied [20]
Bragg reflectors basedbased on graphene to realize tunable tunable low-loss filtering effect in the broadband multiple-step structures, and
Summary
Graphene has become a popular research field and has attracted an increasing amount of attention [1]. Surface plasmon polaritons (SPPs) bound to graphene display a strong field confinement, already verified by experiments [7,8] These remarkable and outstanding properties enable a utility optical material in optoelectronic applications. The tunable plasmonic Bragg reflectors based on graphene silicon waveguide have been presented and studied [20]. The plasmonic Bragg reflector (PBR) structure based on graphene with multiple-step units are numerically presented in the mid-infrared region. Multiple peaks appear in the stopband while the defect introduces into the multiple-step PBRs. The finite element method (FEM) has been utilized to perform index on simulation graphene iswork. PBRs.ofThe (FEM)ishas been in utilized simulation work It consists of a monolayer graphene and a finite array of periodic highly doped silicon-based grating, and they are separated
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