Tunable graphene-based mid-infrared band-pass planar filter and its application

Abstract

We have designed and proposed the edge modes supported by graphene ribbons and the planar band-pass filter consisting of graphene ribbons coupled to a graphene ring resonator by using the finite-difference time-domain numerical method. Simulation results show that the edge modes improve the electromagnetic coupling between devices. This structure works as a novel, tunable mid-infrared band-pass filter. Our studies will benefit the fabrication of planar, ultra-compact nano-scale devices in the mid-infrared region. A power splitter consisting of two output ribbons that is useful in photonic integrated devices and circuits is also designed and simulated. These devices are useful for designing ultra-compact planar devices in photonic integrated circuits.

Tunable Mid-Infrared Graphene Plasmonic Cross-Shaped Resonator for Demultiplexing Application

“…Previously published works [4,5,24,26,[39][40][41][42][43][44][45][46][47][48] have reported transmission ratios up to 99% and FWHM values between 2-650 nm. In the design of demultiplexers, it is important to minimize the cross talk, thus the aim of this study was to find a design for demultiplexer which presents a better cross talk comparing to [4,5,26,39,[44][45][46].…”

“…The maximum transmission ratio, the full width at half maximum (FWHM), the cross talk, and tunability without need to re-fabricate the structures of some other works are reported and compared with our work in Table 4. References [24,[40][41][42][43]47,48] did not report demultiplexing application of their proposed structures, so we leave dash for their cross talks in the table. References [41,42] are absorbers with absorption spectra and they do not contain transmission spectra.…”

“…In practice, graphene has strong confinement of lightwaves, long propagation length, and low loss making it superior to metals [21][22][23]. Because of the significant advantages of graphene, many graphene based structures-such as filters [24,25], demultiplexers [26,27], modulators [28,29], couplers [30,31], absorbers [32,33], and solar cells [34]-are designed and analyzed. Fabrication of graphene-based devices in MIR region was recently reported in [35,36].…”

“…In the design of demultiplexers, it is important to minimize the cross talk, thus the aim of this study was to find a design for demultiplexer which presents a better cross talk comparing to [4,5,26,39,[44][45][46]. Moreover, a demultiplexer design should be conducted so that it maintains a desired single mode resonance in a wider wavelength range than previously reported structures [4,5,24,26,39,40,[42][43][44][45][46][47][48].…”

Room-temperature infrared photodetectors with hybrid structure based on two-dimensional materials

“…In order to further enhance the photoresponse of the photodetector and obtain a tunable response spectrum, plasmonic nanostructures can also be applied to the infrared photodetector based on two-dimensional materials. [125][126][127][128][129][130][131][132][133] response spectrum in the range of visible to near-infrared and explained the reasons for photocurrent enhancement. [131] The schematic of photodetector and optical image are shown in Figure 10a and b.…”