公开(公告)号：US20220381973A1

公开(公告)日：2022-12-01

申请号：US17881902

申请日：2022-08-05

Applicant: TOPPAN INC.

Inventor： Yukari ODA ,  Masashi KAWASHITA ,  Yoshiko ISHIMARU ,  Azusa YAMAGISHI

IPC: G02B6/10 ,  G02B6/124 ,  G02B6/13

Abstract: An optical device includes a concave-convex structure layer having a concavo-convex structure on a surface thereof, the concavo-convex structure formed of a plurality of convexities or a plurality of concavities which are arranged with a sub-wavelength period, a high refractive index layer made of a material having a refractive index higher than that of the concavo-convex structure layer and located on the concavo-convex structure while having a surface conforming to the concavo-convex structure, and a low refractive index layer made of a material having a refractive index lower than that of the high refractive index layer and located on the high refractive index layer. The high refractive layer includes first grating high refractive index portions located at a bottom of the concavo-convex structure to form a first sub-wavelength grating, and second grating high refractive index portions located at a top of the concavo-convex structure to form a second sub-wavelength grating.

公开(公告)号：US20220113458A1

公开(公告)日：2022-04-14

申请号：US17557917

申请日：2021-12-21

Applicant: TOPPAN INC.

Inventor： Masashi KAWASHITA ,  Yukari ODA

IPC: G02B5/26 ,  H01L27/146

Abstract: An optical device including a concavo-convex structure layer composed of a plurality of protrusions arranged having a subwavelength period; a high refractive index layer located on the concavo-convex structure and having a surface shape following the concavo-convex structure; and a low refractive index layer located on the high refractive index layer and having a surface shape following a concavo-convex structure on a surface of the high refractive index layer. The high refractive index layer includes a first grating high refractive index region located on a bottom of the concavo-convex structure to form a subwavelength grating, and a second grating high refractive index region located on a top of the concavo-convex structure to form a subwavelength grating. The high refractive index layer has a refractive index higher than both the refractive indices of the concavo-convex structure layer and the low refractive index layer.