Patent ID: 9679091
Date: 2017-06-13
CPC Classifications: B82Y,G06F,H01L,Y02E

Claim:
1. An infrared photodetector having a predetermined wavelength detection range comprising: a contact layer through which infrared light enters; an absorption region positioned such that light admitted through the contact layer passes into the absorption region; a diffractive region operatively associated with the absorption region comprising a plurality of diffractive elements operating to diffract light into the absorption region; the configuration of the diffractive region and diffractive elements being determined by computer simulation to determine an optimal diffractive region and absorption region configuration based upon a predetermined wavelength detection range, the diffractive region operating to diffract light entering through the contact layer such that phases of diffracted waves from locations within the photodetector including waves reflected by sidewalls, and waves reflected by the diffractive elements form a constructive interference pattern inside the absorption region.