Fabrication of Distributed Bragg Reflector With Complex Index Center Cavity Material

Date of Award

5-5-2024

Degree Name

M.S. in Electro-Optics

Department

Department of Electro-Optics and Photonics

Advisor/Chair

Andrew Sarangan

Abstract

This study aimed to develop a multi-layer coating design to enhance the absorption of a thin layer of a complex index material within a resonant cavity by targeting reduced refection at 1550 nm utilizing dielectric materials SiO2 and TiO2 in distributed Bragg reflectors (DBRs) as the reflective elements in a Fabry-Perot like resonator. The placement of the absorbing layer in the resonant cavity enhanced the absorption of the complex index material. Gold was selected as the complex index material for this coating. Calibration layers of each material were deposited using reactive sputter deposition at the Nanofab Lab at the University of Dayton, and their thicknesses and refractive index values determined though spectroscopic ellipsometry at the Air Force Research Laboratory and applying optical dispersion models. The fabricated coating’s optical response was measured and compared to the modelled optical spectra.

Keywords

distributed bragg reflectors, fabry-perot resonator, gold, absorber

Rights Statement

Copyright 2024, author

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