ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,457,824, issued on Oct. 28, was assigned to Asahi Kasei Microdevices Corp. (Tokyo).
"Infrared optical device" was invented by Daiki Yasuda (Tokyo) and Hiromi Fujita (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "Provided is an infrared optical device that is easy to produce and has high performance. The infrared optical device having a peak at a center wavelength Lambda includes: a semiconductor substrate; and a thin film laminate portion including a first reflecting layer, an active layer, a p-type semiconductor layer, and a first electrode layer formed on the semiconductor substrate in stated order. The first reflecting layer and the p-type sem...