Exciting and confining light in Cr doped gallium oxide



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Alonso Orts, Manuel and Nogales Díaz, Emilio and San Juan, José M. and Nó, María L. and Méndez Martín, Bianchi (2019) Exciting and confining light in Cr doped gallium oxide. In Conference on Oxide-Based Materials and Devices X. Proceedings of SPIE, 10919 . SPIE, Bellingham, Washington. ISBN 978-1-5106-2481-8

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Official URL: http://dx.doi.org/10.1117/12.2509672


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) beta-Ga_2O_3 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 Ga_2O_3 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 (mu-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.

Item Type:Book Section
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© 2019 SPIE
ISSN: 0277-786X
Conference on Oxide-Based Materials and Devices(10. 2019. San Francisco)
The authors are grateful for the financial support from the MINECO (Projects No. MAT-2015-65274-R-FEDER and PCIN-2017-106). M. A.-O. acknowledges financial support from MICINN (FPU Contract No. FPU15/01982).

Uncontrolled Keywords:Resonant modes; Gallium oxide; DBR; Optical microcavities; Tunability
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:57521
Deposited On:11 Nov 2019 17:26
Last Modified:12 Nov 2019 08:44

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