Patent ID: 9632248
Date: 2017-04-25
CPC Classifications: G02B

Claim:
1. An integrated photonic device comprising: a substrate; an integrated waveguide formed on the substrate, the integrated waveguide being configured to conduct light of a predetermined wavelength; a sub-wavelength grating integrated in the integrated waveguide, the sub-wavelength grating providing a first periodic variation of a refractive index in the integrated waveguide in at least one first spatial direction, wherein the first periodic variation has a first pitch that is less than half of the predetermined wavelength; and a diffracting grating for at least one of (1) coupling light of the predetermined wavelength into the integrated waveguide via the sub-wavelength grating or (2) coupling light of the predetermined wavelength out of the integrated waveguide via the sub-wavelength grating, the diffracting grating (i) providing a second periodic variation of the refractive index in at least one second spatial direction, wherein the second periodic variation has a second pitch that is at least half of the predetermined wavelength and (ii) being at least one of: (a) arranged above the sub-wavelength grating with respect to the substrate; or (b) partially etched in the sub-wavelength grating,