Patent ID: 7732237

Claim:
A method of forming an optically active device comprising: providing a silicon substrate having a first surface and a second surface; epitaxially growing a silicon buffer layer on the silicon substrate on a first surface; epitaxially growing a SiGe cladding layer having a plurality of arrays of quantum dots disposed therein, the quantum dots being formed from a polar compound semiconductor material having a lattice mismatch with the silicon buffer layer; defining an optically active region in the cladding layer having the plurality of arrays of quantum dots disposed therein; forming oxide isolation regions adjacent to the optically active region; forming a first quarter wave stack above the optically active region; forming a first metal contact configured for electrical contact with the optically active region; forming a recess in the second surface of the silicon substrate; forming a second quarter wave stack in the recess below the optically active region; and forming a second metal contact on a second surface of the silicon substrate.