FIELD

The embodiments discussed herein are related to photodetectors and imaging devices.

BACKGROUND

There are various kinds of photodetectors that perform photoelectric conversion.

International Publication Pamphlet No. WO 2010/021073 and Japanese Laid-open Patent Publication No. 9-55532 are disclosed as related art.

SUMMARY

According to an aspect of the embodiments, a photodetector includes: a photoelectric conversion layer including a first principal surface from which light enters and a second principal surface on the opposite side from the first principal surface and configured to perform photoelectric conversion on the light; a first diffraction grating formed on a side of the second principal surface and including a configuration where a plurality of first surfaces which extend in a stripe state in a first direction and a plurality of second surfaces which extend in a stripe state in the first direction and have a height difference with respect to the first surfaces are alternately arranged; a plurality of metal wires provided at intervals over each of the first surfaces and the second surfaces and which extend in the first direction or a second direction perpendicular to the first direction; and a second diffraction grating formed over the first diffraction grating and including a plurality of grooves which are formed at intervals and extend in the second direction.

The object and advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the claims.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention.

