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Exciting and confining light in Cr doped gallium oxide
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Paper Abstract

On one hand, interest on the tunability of the optical microcavities has increased in the last few years due to the need for selective nano- and microscale light sources to be used as photonic building blocks in several applications. On the other, transparent conductive oxide (TCO) β-Ga2O3 is attracting attention in the optoelectronics area due to its ultra wide band gap and high breakdown field. However, at the micro- and nanoscale there are still some challenges to face up, namely the control and tuning of the optical and electrical properties of this oxide. In this work, Cr doped Ga2O3 elongated microwires are grown using the vapor-solid (VS) mechanism. Focused Ion Beam (FIB) etching forms Distributed Bragg Reflector (DBR)-based resonant microcavities. Room temperature microphotoluminescence (μ-PL) spectra show strong modulations in the red-NIR range on five cavities with different lengths. Selectivity of the peak wavelengths is obtained, proving the tunability of this kind of optical systems. The confined modes are analyzed experimentally, analytically and via finite difference time domain (FDTD) simulations. Experimental reflectivities up to 78% are observed.

Paper Details

Date Published: 1 March 2019
PDF: 7 pages
Proc. SPIE 10919, Oxide-based Materials and Devices X, 109191S (1 March 2019); doi: 10.1117/12.2509672
Show Author Affiliations
M. Alonso-Orts, Univ. Complutense de Madrid (Spain)
E. Nogales, Univ. Complutense de Madrid (Spain)
José M. San Juan, Univ. del País Vasco (Spain)
María L. Nó, Univ. del País Vasco (Spain)
Bianchi Méndez, Univ. Complutense de Madrid (Spain)

Published in SPIE Proceedings Vol. 10919:
Oxide-based Materials and Devices X
David J. Rogers; David C. Look; Ferechteh H. Teherani, Editor(s)

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