公开(公告)号：US20250028281A1

公开(公告)日：2025-01-23

申请号：US18737648

申请日：2024-06-07

Applicant: SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION

Inventor： Yoonchan JEONG ,  Seung-Woo NAM ,  Youngjin KIM ,  Dongyeon KIM

IPC: G03H1/22 ,  B82Y20/00 ,  G03H1/00 ,  G03H1/32

Abstract: A holographic display using a metasurface and a metasurface optimization method are provided, wherein the holographic display includes a spatial light modulator, a half-wave plate configured to rotate a linear polarization direction of light incident from the spatial light modulator at a certain angle and output light including a horizontal linear polarization component and a vertical linear polarization component having a same magnitude and orthogonal to each other, and a metasurface including nanostructures configured to perform different phase modulations on the horizontal linear polarization component and the vertical linear polarization component, and the metasurface is optimized by using a gradient descent method.

公开(公告)号：US20240193733A1

公开(公告)日：2024-06-13

申请号：US17904771

申请日：2021-12-30

Applicant: SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION

Inventor： Byoungho LEE ,  Seung-Woo NAM ,  Juhyun LEE ,  Siwoo LEE

IPC: G06T5/10 ,  G03H1/26 ,  G06T11/00

CPC classification number: G06T5/10 ,  G03H1/2645 ,  G06T11/00 ,  G03H2226/02 ,  G06T2207/20056 ,  G06T2210/52

Abstract: A holographic aberration correction method and apparatus are provided. The holographic aberration correction apparatus includes: generating a plurality of sub-holograms in a hologram, as a matrix; calculating a plurality of eigenmodes and an eigenvalue and a weight corresponding to each of the eigenmodes by performing singular value decomposition on the matrix; selecting a predefined number of eigenmodes in the order of largest eigenvalues; calculating a plurality of first results which are obtained by multiplying a plurality of identical images by respective weights corresponding to the plurality of selected eigenmodes; calculating a plurality of second results by performing convolution of the plurality of first results and the plurality of selected eigenmodes, respectively; and generating an aberration-corrected hologram by adding the plurality of second results.

公开(公告)号：US20240192638A1

公开(公告)日：2024-06-13

申请号：US17904744

申请日：2021-12-30

Applicant: SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION

Inventor： Byoungho LEE ,  Dukho LEE ,  Kiseung BANG ,  Seung-Woo NAM

IPC: G03H1/22 ,  G03H1/04 ,  G03H1/08 ,  G03H1/12

CPC classification number: G03H1/2202 ,  G03H1/0443 ,  G03H1/0486 ,  G03H1/0808 ,  G03H1/12 ,  G03H2001/045 ,  G03H2001/0833 ,  G03H2001/2239

Abstract: A holographic display apparatus and a hologram optimization method for the apparatus are provided. The holographic display apparatus includes a focus-forming optical element configured to form a plurality of foci by receiving plane waves; a collimating lens configured to propagate, as plane waves, light incident through the plurality of foci; and a spatial light modulator configured to generate a holographic image by overlapping a plurality of plane waves incident from the collimating lens.