Ti3C2 and Ti2C MXenes-Based Distributed Bragg Reflectors in Fabry Pérot Cavity’s Resonance Tuning

Document Type

Article

Publication Date

2025

Abstract

We have semi-analytically studied the reflection and transmission spectra of the Fabry Pérot interferometer constructed from (1) two distributed Bragg reflectors (DBRs) and (2) silica sandwiched between these DBRs. Optical properties of comparatively high refractive Ti3C2 and Ti2C MXenes and TiO2 compound and low refractive MgF2, MgO, and SiO2 compounds have been calculated using first-principles quantum mechanical calculations based on density function theory (DFT). The refractive indices determined from DFT calculations have been used in the multilayer system’s transmittance and reflectance relationships, which are theoretically derived from Maxwell’s equations. A DBR is made by stacking a high-refractive material alternatively with a low-refractive material. The cavity formed between two DBRs causes the formation of a transmission peak within the photonic stop band in the transmittance versus wavelength plot, with the transmission coefficient of almost 1, indicating that the system becomes almost transparent to incident light, and that the light behaves as if there is no Fabry Pérot interferometer at all. We reveal that the wavelength corresponding to the transmission peak depends on the thickness of the cavity. As the thickness increases, we found that the resonance peak shifts towards the red end of the electromagnetic spectrum. © 2025 Elsevier B.V., All rights reserved.

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