Patent ID: 8885987

Claim:
Photonic passive structure to couple and guide light between photonic active devices, light emitting devices and light-valves, monolithically integrated with CMOS devices, which may be arranged into 2D arrays, and the top of the CMOS metallization layer stack interconnecting said photonic devices and CMOS devices, wherein said photonic passive structure comprises a hole between the near surface of said photonic active devices and the top of said CMOS metallization stack, said hole being filled with a dielectric and having inner surfaces covered with a metal film, a GRadient INdex (GRIN) lens formed on top of said hole, said GRIN lens having a radially graded index of refraction and a diameter larger than the diameter of said hole, and directing impinging light rays into the inner region of said hole, and wherein said hole has a rectangular cross section, in which a smaller side is smaller than half-wave length, and in which a longer side is longer than half wave-length, thereby only allowing transmission of polarization that is parallel to the longer side of the rectangle.