US 12,270,701 B2
Light detector
Soh Uenoyama, Hamamatsu (JP); and Takuya Hashimoto, Hamamatsu (JP)
Assigned to HAMAMATSU PHOTONICS K.K., Hamamatsu (JP)
Filed by HAMAMATSU PHOTONICS K.K., Hamamatsu (JP)
Filed on Mar. 20, 2024, as Appl. No. 18/610,669.
Application 18/610,669 is a continuation of application No. 18/139,426, filed on Apr. 26, 2023, granted, now 11,976,968.
Claims priority of application No. 2022-077091 (JP), filed on May 9, 2022.
Prior Publication US 2024/0219230 A1, Jul. 4, 2024
Int. Cl. G01J 1/44 (2006.01); G01J 1/04 (2006.01)
CPC G01J 1/44 (2013.01) [G01J 1/0411 (2013.01); G01J 2001/4466 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A light detector comprising:
a light detection substrate having at least one light receiving region and a light incident surface on which a detection target light is incident; and
a meta-lens configured by a plurality of unit structures arranged in a grid pattern and disposed on the light incident surface to focus the detection target light,
wherein when viewed in a thickness direction of the light detection substrate, an opening region in which the unit structure is not formed is provided in a region including a center of the meta-lens,
the plurality of unit structures are configured such that a phase distribution of the meta-lens follows a quadratic phase pattern,
a width of each unit structure constituting the meta-lens is set such that phase Φ (x, y) at each coordinate (x, y) satisfies the following Equation (1), and
in the Equation (1), the coordinate (x, y) is two dimensional coordinate in a case where the center of the meta-lens is set as an origin (0, 0) when viewed in the thickness direction, λeff is an effective wavelength of the detection target light passing through the meta-lens, and f is a focal length in accordance with a maximum angle between the detection target light passing through the meta-lens and an optical axis of the meta-lens

OG Complex Work Unit Math