Second harmonic generation in GaAs-on-insulator waveguides fabricated at the wafer-scale
Year: 2019
Type: preprint
Abstract: Second harmonic generation (SHG) is demonstrated with unprecedented efficiency for a single-pass device. Modal phase-matching in GaAs-on-insulator waveguides is used to convert a 2.0 $\mu$m transverse-electric polarized pump to a 1.0 $\mu$m transverse-magnetic polarized signal with an efficiency of 40 W$^{-1}$ in a length of 2.9 mm. The FWHM bandwidth of the signal is 0.5 nm, and efficient SHG is demonstrated over a temperature range of 45 $^{\circ}$C. Devices are fabricated on 76 mm wafers with high uniformity and the loss at the signal wavelength is reduced by minimizing the surface defect states. Wafer-bonding between GaAs and SiO$_2$ is optimized to minimize waveguide loss, and SHG conversion efficiency tolerance to fabrication variation is studied.
Source: arXiv (Cornell University)
Language: English
Topic: Photonic and Optical Devices
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2997246656