Thermal Bistability and Impact of Graphene Based Nanocomposite Defect Layer on a Nano Photonic Multiband Absorber

Nanophotonic multispectral absorbers and their enhanced optoelectronic performance have been studied in the research areas of photonics. The graphene-based quasi-photonic structures has amended the progress in this area. In this paper, the temperature tunable absorption was explored numerically using the proposed graphene-based phase change material (PCM) nanocomposite cavity in the photonic structure. This work observes higher multiband absorption in the infrared spectrum with thermal tuning and resonant frequency switchable with variation of composite material. The design procedure of cavities improves higher quality factor (Q) and Full-Width Half-Maximum (FWHM) compared to other literature with the inclusion of graphene as a defect. The temperature-dependent graphene-based nanocomposite cavity in the proposed structure varies absorption peaks with changes in defect layer thickness, chemical potential of the graphene layer, and angle of the incident light. The performance of the structure was also studied in terms of absorption behavior under oblique incidence, enhanced Q-factor and FWDM with blue shift resonant frequency under different polarizations are observed. These observations can be used for designing optical filters and narrowband optical absorbers.