$ALMU @Aeluma_Inc pulls in another patent. Seems important:
ALEXANDRIA, Virginia , June 9 -- AELUMA, INC. , Goleta, California has been assigned a patent (No. US 12652865 B1, initially filed March 3, 2023 ) developed by four inventors Bei Shi , Goleta, California ; Jonathan Klamkin , Goleta, California ; Simone Suran Brunelli , Goleta, California ; and Bowen Song , Goleta, California , for "Method and device for photodetector circuit with selectively transparent buffer."
A method and device for a sensor using a selectively transparent buffer material. The method includes forming a buffer region overlying a silicon substrate, and forming a wavelength configuring material overlying the buffer region. This wavelength configuring material can be configured for non-absorption of a selected wavelength range via plurality of material regions having at least alternating first and second material compositions. The material compositions can include InP, InGaAs, GaAs, GaP, InGaAsP, InAs, InAlAs, InAlGaAs, InGaP, or the like. These materials can also include strained layer superlattice (SLS) or strained interlayer (SIL) materials as dislocation filter layers. Device materials; including at least an n-type contact region, an absorption region, one or more band transition region, a p-type spacer region, and a p-type contact region; can be formed overlying the wavelength configuring material. The resulting device can include mesa-type or planar-type devices and can be configured for backside or topside illumination.