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Design of a highly sensitive photonic crystal refractive index sensor incorporating ring-shaped GaAs cavity

Rahman-Zadeh F., Danaie M., Kaatuzian H.

Opto-Electronics Review

2019

Vol. 27, No. 4

369--377

Two highly sensitive optical sensor topologies are proposed and simulated in this paper. The proposed structures are optimized to provide better performance characteristics such as sensitivity, detection limit, and quality factor. They are based on two-dimensional photonic crystals consisting of rectangular arrays of GaAs rods in SiO2 substrates. Such lattices have bandgaps for transverse magnetic modes. Two-dimensional finite difference time domain and plane wave expansion methods are used for the simulation and analysis of the refractive index sensors and particle swarm optimization method is used to optimize the structural parameters. The designed structures show a high sensitivity to refractive index variations. They are able to detect refractive indices from 1.33 to 1.5. An excellent figure of merit equal to 737 RIU−1 is observed for the proposed structure and a significant improvement is observed compared to the structures reported in the literature.

Electrically driven thermal annealing set-up dedicated to high quality factor optical resonator fabrication

Salzenstein P., Diallo S., Zarubin M.

Journal of Power Technologies

2018

Vol. 98, nr 2

198--201

This paper reports on the development of an oven with a special purpose electronic board and specialist materials such as basalt fiber and nichrome. It is designed for optical resonators which are temperature controlled during their annealing process to increase their quality factor for the purpose of photonics applications.