Patent ID: 9726794
Date: 2017-08-08
CPC Classifications: G02B

Claim:
1. A high index contrast grating (HICG) structure comprising: a plurality of gratings fabricated from a high refractive index layer, said plurality of gratings including a first grating, a second grating adjacent said first grating, and a third grating adjacent said second grating such that said second grating is situated between said third grating and said first grating; wherein said high refractive index layer is situated over a low refractive index substrate; and wherein said high refractive index layer is patterned after determining a combination of a period, a thickness, and a duty cycle of each of said plurality of gratings for a desired reflection phase profile; said combination being determined for said first grating based on a lookup table; said combination being determined for said second grating using a location and a period of said first grating and based on said lookup table; and said combination being determined for said third grating using a location and a period of said second grating and based on said lookup table.