US 12,142,307 B2
Optical memory, optical diffraction element, and recording method
Yuichiro Kunai, Tokyo (JP)
Assigned to Fujikura Ltd., Tokyo (JP)
Appl. No. 18/265,304
Filed by FUJIKURA LTD., Tokyo (JP)
PCT Filed Aug. 20, 2021, PCT No. PCT/JP2021/030685
§ 371(c)(1), (2) Date Jun. 5, 2023,
PCT Pub. No. WO2022/145084, PCT Pub. Date Jul. 7, 2022.
Claims priority of application No. 2020-219578 (JP), filed on Dec. 28, 2020.
Prior Publication US 2024/0038264 A1, Feb. 1, 2024
Int. Cl. G11B 7/0045 (2006.01); G11B 7/0033 (2006.01); G11B 7/1353 (2012.01); G11B 7/1367 (2012.01); G11B 7/24035 (2013.01)
CPC G11B 7/00454 (2013.01) [G11B 7/0033 (2013.01); G11B 7/1353 (2013.01); G11B 7/1367 (2013.01); G11B 7/24035 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A light diffraction element comprising:
cells having respective thicknesses or respective refractive indexes set independently; and
an optical memory, directly or indirectly disposed on the cells, comprising:
a support; and
nanoparticles, each of which changes between a crystal phase and an amorphous phase when irradiated with light, wherein
the nanoparticles are supported by the support and spaced apart from each other in one or both of an in-plane direction of a face of the support and a direction normal to the face of the support, and
one or more of the nanoparticles are disposed in each of sections of the optical memory, wherein each of the sections is a region obtained by projecting a bottom face of each of the cells on to the face of the support.