Patent ID: 8435809
Filing Date: 2013-05-07
Classification: G02B,H01L

Abstract:
1. A method for forming a mirror in a silicon photonic circuit, comprising: providing a handle wafer; forming a buried oxide (BOX) layer on the handle wafer; providing a device wafer comprising a silicon on insulator (SOI) wafer on the BOX layer; depositing a nitride layer on the device wafer; etching a trench in the device wafer to expose the BOX layer; etching the BOX layer to create an undercut beneath the device layer; immersing in an etchant to fill the trench creating a trapezoidal shape from the trench and undercut areas with the device layer comprising a facet; depositing and reflowing a thick oxide layer in the trench; and replanerizing the device wafer, wherein the facet comprises a re-entrant total-internal-reflection (TIR) mirror.