Patent ID: 11927806
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 2:
3. The apparatus of claim 2, wherein each of the plurality of coupling gratings comprises a first trench, a pillar and a second trench disposed between the first trench and the pillar, wherein a first pillar of a first coupling grating of the plurality of coupling gratings has a first width and a second pillar of a second coupling grating of the plurality of coupling gratings has a second width different than the first width, and wherein a first depth of the first trench is in a range of 250-350 nanometer, wherein a second depth of the second trench is smaller than the first thickness, and wherein a height of the pillar is equal to the first depth of the first trench.