US 11,705,473 B2
Optical filters and associated imaging devices
Sozo Yokogawa, Kanagawa (JP); Hirotaka Murakami, Kanagawa (JP); and Mikinori Ito, Kanagawa (JP)
Assigned to Sony Semiconductor Solutions Corporation, Kanagawa (JP)
Filed by Sony Semiconductor Solutions Corporation, Kanagawa (JP)
Filed on Jan. 6, 2022, as Appl. No. 17/570,310.
Application 17/570,310 is a continuation of application No. 16/611,973, granted, now 11,264,424, previously published as PCT/JP2018/017381, filed on May 1, 2018.
Claims priority of application No. 2017-096403 (JP), filed on May 15, 2017.
Prior Publication US 2022/0208826 A1, Jun. 30, 2022
Int. Cl. H01L 27/14 (2006.01); H01L 27/146 (2006.01)
CPC H01L 27/14645 (2013.01) [H01L 27/14612 (2013.01); H01L 27/14629 (2013.01); H01L 27/14621 (2013.01); H01L 27/14627 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A light detecting device, comprising:
a semiconductor substrate including a first photoelectric conversion region and a second photoelectric conversion region;
a first separation region disposed in the semiconductor substrate, wherein the first separation region is disposed between the first photoelectric conversion region and the second photoelectric conversion region in a cross-sectional view; and
an optical filter disposed above a light-receiving surface of the semiconductor substrate,
wherein the optical filter comprises:
a diffraction grating;
a first core layer; and
a first portion of a reflector disposed above the first separation region in the cross-sectional view,
wherein a refractive index of the reflector is different from a refractive index of the first core layer.