Numerical analysis of a single-mode microring resonator on a YAG-on-insulator

Shijia Lu,Guangyue Chai,Huangpu Han,Yujie Ma,Yuhao Wu,Shuangchen Ruan,Meng Wang,Linlin Chen,Bingxi Xiang

doi:10.1515/phys-2021-0107

Shijia Lu, Guangyue Chai + Show 7 more

Open Access

https://doi.org/10.1515/phys-2021-0107

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Abstract

Abstract A numerical analysis of a compact microring resonator that was defined on a yttrium-aluminum-garnet (YAG) thin film bonded on top of a SiO2 cladding layer and operated at the wavelengths of approximately 1.064 and 1.6 μm was performed. The single-mode conditions of YAG waveguides at different waveguide geometries and their propagation losses at different SiO2 cladding layer thicknesses were systematically analyzed. The key design parameters of the microring resonator, such as gap size and ring radius, were simulated based on the 2.5-dimensional variational finite-difference time-domain method. This study could be helpful in understanding the mechanism of microring resonators defined on YAG thin films and fabricating integrated microlaser sources on YAG-on-insulators.

Highlights

Yttrium-aluminum-garnet (Y3Al5O12, YAG) is one of the most important materials for solid-state lasers because of its unique optical and physical properties, such asIn recent years, microring lasers have gained great research interest because of their potential role as very compact light sources with a low pump threshold in the field of optical communications [16,17,18]
First-order transverse electric (TE) and transverse magnetic (TM) modes appeared at the YAG waveguide thicknesses of 0.9 and 0.92 μm, respectively
The Q-factor increased with the increase of the gap size, and the Q-factor of the TE mode was larger than that of the TM mode

Summary

Introduction

Yttrium-aluminum-garnet (Y3Al5O12, YAG) is one of the most important materials for solid-state lasers because of its unique optical and physical properties, such asIn recent years, microring lasers have gained great research interest because of their potential role as very compact light sources with a low pump threshold in the field of optical communications [16,17,18]. The high refractive index difference between a cladding layer (SiO2) and a YAG film results in strong light guidance, which is suitable for the fabrication of high-performance integrated devices with a small footprint, especially microring resonators. The full-vectorial finite-difference method was used to investigate the single-mode conditions of YAG waveguides at different waveguide sizes and their propagation losses at different SiO2 cladding layer thicknesses.

Results

Conclusion