SOLID STATE IMAGING APPARATUS AND ELECTRONIC DEVICE
Provided is a solid state imaging apparatus including a transparent substrate formed of a birefringent material having a high refractive index in a direction vertical to a light receiving surface and a low refractive index in a direction parallel to the light receiving surface, the transparent substrate being disposed on the light receiving surface, and an electronic device including the solid state imaging apparatus.
1 . A solid state imaging apparatus, comprising:
a transparent substrate formed of a birefringent material having a high refractive index in a direction vertical to a light receiving surface and a low refractive index in a direction parallel to the light receiving surface, the transparent substrate being disposed on the light receiving surface.
2 . The solid state imaging apparatus according to claim 1 , wherein
the birefringent material has a refractive index ratio n e /n o of the high refractive index n e and the low refractive index n o of 1.1 or more.
3 . The solid state imaging apparatus according to claim 1 , wherein
the birefringent material is an inorganic material.
4 . The solid state imaging apparatus according to claim 3 , wherein
the inorganic material is crystal, TiO 2 , calcite or lithium niobate.
5 . The solid state imaging apparatus according to claim 1 , wherein
the birefringent material is an organic material.
6 . The solid state imaging apparatus according to claim 5 , wherein
the organic material is polymethyl methacrylate (PMMA), polycarbonate resin (PC), polystyrene (PS), acrylonitrile styrene (AS resin) and polymethacrylic styrene (MS resin).
7 . The solid state imaging apparatus according to claim 1 , wherein
the birefringent material has a dielectric multilayer structure where materials having different relative permittivities are combined.
8 . The solid state imaging apparatus according to claim 7 , wherein
the dielectric multilayer structure is provided by combining the materials having different relative permittivities such that each area of the materials having the same relative permittivity is 500 nm or less.
9 . The solid state imaging apparatus according to claim 8 , wherein
the dielectric multilayer structure is formed by arranging the materials having the same relative permittivity in a lattice, hexagon, octagon or columnar shape.
10 . The solid state imaging apparatus according to claim 1 , wherein
the birefringent material has refractive index dispersion such that the refractive index is high to a light having a short wavelength and the refractive index is low to a light having a long wavelength.
11 . The solid state imaging apparatus according to claim 10 , wherein
the birefringent material has an Abbe number of 40 or less.
12 . An electronic device, comprising a transparent substrate formed of a birefringent material having a high refractive index in a direction vertical to a light receiving surface and a low refractive index in a direction parallel to the light receiving surface, the transparent substrate being disposed on the light receiving surface.
13 . A solid state imaging apparatus, comprising a transparent substrate formed of a material having refractive index dispersion such that the refractive index is high to a light having a short wavelength and the refractive index is low to a light having a long wavelength, the transparent substrate being disposed on the light receiving surface.
14 . The solid state imaging apparatus according to claim 13 , wherein
the material having refractive index dispersion has an Abbe number of 40 or less.
15 . The solid state imaging apparatus according to claim 14 , wherein
the material having refractive index dispersion is polycarbonate resin (PC), polystyrene (PS), acrylonitrile styrene (AS resin), polymethacrylic styrene (MS resin), a glass-based material or TiO 2 .
16 . An electronic device, comprising a solid state imaging apparatus including a transparent substrate formed of a material having refractive index dispersion such that the refractive index is high to a light having a short wavelength and the refractive index is low to a light having a long wavelength, the transparent substrate being disposed on the light receiving surface.