ALEXANDRIA, Va., Nov. 18 -- United States Patent no. 12,477,839, issued on Nov. 18, was assigned to Lumentum Operations (San Jose, Calif.).
"Semiconductor photodetector" was invented by Takashi Toyonaka (Yokohama, Japan), Hiroshi Hamada (Yokohama, Japan), Ryu Washino (Yokohama, Japan), Shigetaka Hamada (Sagamihara, Japan) and Suguru Kato (Sagamihara, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A semiconductor photodetector includes a substrate; a mesa structure on the substrate, the mesa structure being composed of some layers including an upper layer and a lower layer, the upper layer being an absorption layer of light, the lower layer being a wide bandgap layer with a bandgap wide enough not to ab...