公开(公告)号：US20230266512A1

公开(公告)日：2023-08-24

申请号：US18005564

申请日：2021-07-14

Applicant: DigiLens Inc.

Inventor： Gerald Buxton ,  Shibu Abraham ,  Richard E. Bergstrom, Jr. ,  Alastair John Grant ,  Tsung-Jui Ho ,  Baeddan George Hill ,  Michiel Koen Callens ,  Hua Gu

IPC: G02B5/18 ,  G02B6/34 ,  G02F1/13 ,  G02F1/1334 ,  G11B7/0065

CPC classification number: G02B5/1857 ,  G02B6/34 ,  G02F1/1326 ,  G02F1/13342 ,  G11B7/0065 ,  G02B2207/101

Abstract: Disclosed herein is a holographic mixture including nanoparticles used to form gratings through holographic exposure. In various embodiments, exposure of the holographic mixture causes the nanoparticles to diffuse to dark fringe regions which creates nanoparticle rich regions and nanoparticle poor regions. Some embodiments include a multi-layer grating which includes a layer formed through the exposed holographic mixture and another layer directly applied above the exposed holographic mixture. The other layer may also be exposed through a holographic recording beam.

公开(公告)号：US20240201584A1

公开(公告)日：2024-06-20

申请号：US18553512

申请日：2022-03-30

Applicant: DigiLens Inc.

Inventor： Shibu Abraham ,  Milan Momcilo Popovich ,  Alastair John Grant ,  Ratson Morad ,  Hua Gu ,  Gerald Buxton

IPC: G03F7/00 ,  C08F2/50 ,  G02B5/32 ,  G03F7/031 ,  G03F7/105

CPC classification number: G03F7/001 ,  C08F2/50 ,  G03F7/031 ,  G03F7/105 ,  G02B5/32

Abstract: Waveguide based displays benefit from gratings which are capable of diffracting both S and P polarized light with high efficiency. While typical surface relief gratings (SRGs) diffract P polarized light efficiently, SRGs do not typically diffract S polarized light efficiently. One class of gratings that diffracts S polarized light with high efficiency is deep SRGs. One approach to producing deep SRGs is holographic polymer dispersed liquid crystal (HPDLC) gratings. In producing HPDLC gratings, a reactive monomer mixture is exposed to light in a polymerization process. Reactive monomer mixtures may include co-initiators and photo-initiator dyes. Co-initiators which include liquid amine synergist have been demonstrated to have advantageous results. Further, photo-initiator dyes with high extinction coefficients have demonstrated advantageous results.