Patent ID: 8860163

Claim:
An optical structure of a semiconductor photomultiplier, which is formed over an upper side of the semiconductor photomultiplier having a plurality of microcells, the optical structure comprising: a first dielectric body formed in a dead area between light receiving areas of the respective microcells and over an upper surface of a substrate in the dead area, the first dielectric body having a cross-section in which a lower side is wider than an upper side; a second dielectric body formed in the a light receiving area of a microcell and over an upper surface of the substrate in the light receiving area, the second dielectric body having a cross-section in which a lower side is narrower than an upper side; and an etch stop layer disposed between the upper surface of the substrate and the first and second dielectric bodies, the etch stop layer including a different material from the first dielectric layer, wherein a refractive index of the second dielectric body is higher than that of the first dielectric body.