Patent ID: 11953725
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Optics (Instruments)
Classification: CPC G  H | IPC G  H

Claim 19:
20. A semiconductor device comprising:
a first layer;
a plurality of grating structures arranged on the first layer and separated from each other, the plurality of grating structures each comprising a bottom portion and top portion, the top portion having a first width and the bottom portion having a second width, the second width being larger than the first width, the plurality of grating structures being parallel to each other and arranged between a first waveguide portion and a second waveguide portion; and
a dielectric material between the plurality of grating structures and on top of the plurality of grating structures,
wherein:
each of the plurality of grating structures is separated from an adjacent one of the grating structures by a third width;
the first widths of ones of the plurality of grating structures close to the first waveguide portion are smaller than the first widths of ones of the plurality of grating structures close to the second waveguide portion;
the second widths of the ones of the plurality of grating structures close to the first waveguide portion are smaller than the second widths of the ones of the plurality of grating structures close to the second waveguide portion;
the third widths corresponding to the ones of the grating structures close to the first waveguide portion are larger than the third widths corresponding to the ones of the grating structures close to the second waveguide portion; and
sums of corresponding ones of the second widths and the third widths are uniform throughout the plurality of grating structures.