Design of MgO-doped-LiNbO3 Based Temperature Tunable Dual-narrowband Absorber

The design of dual-narrowband absorbers and the enhancement of their performance have been studied in the research area of photonics for a very long time. The discovery of graphene boosted the advancement in this area amazingly which led to more theoretical and experimental works in subsequent days. In this paper, the enhancement of temperature tunable absorption was explored analytically using the proposed MgO-doped Lithium Niobate-based cavity. This work includes the design procedure of the cavity with highly nonlinear optical properties, and the absorption behavior was found to be dependent on various parameters such as - wavelength, polarization, angle of incidence, chemical potential of the graphene layer, temperature, etc. Absorptivity of the proposed structure was also studied in terms of peak point adjustability, full width at half maximum (FWHM), and quality (Q) factor. Based on the absorption behavior under oblique incidence, detection of the polarization of the incident light was also demonstrated at the end of this paper.