Year: 2026
Type: article
Abstract: A wavelength-selective retroreflector based on guided-mode resonance (GMR) was proposed for an external cavity mirror of semiconductor lasers. The device, called a focusing cavity-resonator-integrated GMR filter (F-CRIGF), consists of a focusing grating coupler (FGC) integrated in a distributed-Bragg-reflector cavity on a bottom mirror. The F-CRIGF was designed for a 1550-nm-wavelength Gaussian beam whose axis is tilted by 20 degrees from the device’s surface normal. The FGC length and the focal length were 30 μm and 31.2 μm, respectively. A peak retro-reflectance of 68% with a 1.5-nm bandwidth was predicted by two-dimensional finite-difference time-domain simulation.
Institution: Kyoto Institute of Technology
Language: English
Topic: Photonic and Optical Devices
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W7225432331