Solid-state imaging device and imaging apparatus

摘要

A solid-state imaging device includes: unit pixels each having a light-receiving element which is divided into line widths shorter than or equal to a wavelength of light; a plurality of light-transmissive films in a concentric structure; and an effective refractive index distribution. Among the light-transmissive films, a light-transmissive film closest to a center of the concentric structure has an outer edge in a shape of a true circle, and a light-transmissive film far from the center of the concentric structure has an outer edge in a shape of an oval, a ratio of a long axis to a short axis of the oval increases as the light-transmissive film is farther away from the center of the concentric structure, and a direction of the long axis of the oval is orthogonal to a vector which connects the center of the concentric structure and a center of the solid-state imaging device.

主权项

1. A solid-state imaging device comprising:
an imaging area; and unit pixels arranged in a two-dimensional array in the imaging area, the unit pixels each having a light-receiving element and a light-collecting element, wherein the light-collecting element includes a plurality of light-transmissive films concentrically arranged about an axis which extends in a direction perpendicular to a light-receiving surface of the light-collecting element, each light-transmissive film having a width shorter than or equal to a wavelength of light entering the light-receiving element; and the light-collecting element has an effective refractive index distribution controlled according to a combination of the light-transmissive films, the light-transmissive films include a first light-transmissive film which is closest to the axis of the concentrically-arranged light-transmissive films, an outer edge of the first light-transmissive film drawing a true circle in plan view, and a second light-transmissive film different from the first light-transmissive film, an outer edge of the second light-transmissive film drawing an ellipse in plan view, a ratio of a major-axis to a minor-axis of the ellipse of the outer edge of the second light-transmissive film increases as the second light-transmissive film is farther away from the axis of the concentrically-arranged light-transmissive films, and the unit pixels include a first unit pixel disposed at a center of the imaging area and a second unit pixel different from the first unit pixel, and a direction of the major-axis of the ellipse of the second light-transimissive film in the second unit pixel is orthogonal to a vector which connects the axis of the second light-transmissive film and the center of the imaging area in plan view.