公开(公告)号：US20210364686A1

公开(公告)日：2021-11-25

申请号：US17047074

申请日：2019-04-15

Applicant: SINGAPORE UNIVERSITY OF TECHNOLOGY AND DESIGN

Inventor： Tze Peng Kevin LIM ,  Kwang Wei Joel YANG ,  Hailong LIU

IPC: G02B5/32 ,  G03H1/26 ,  G03H1/00

Abstract: There is provided a holographic optical element including: a hologram portion including a plurality of groups of unit regions, each group of unit regions of the hologram portion being configured to produce a respective holographic image under a respective light illumination having a respective predetermined wavelength; and a colour filter portion formed on the hologram portion, the colour filter portion including a plurality of groups of unit regions, each group of unit regions of the colour filter portion being arranged on a corresponding group of the plurality of groups of unit regions of the hologram portion, whereby the plurality of groups of unit regions of the colour filter portion is spatially arranged to form a predetermined colour image. There is also provided a method of forming the holographic optical element. There is further provided an article having optical security incorporated therein.

公开(公告)号：US20180229262A1

公开(公告)日：2018-08-16

申请号：US15748175

申请日：2016-07-28

Applicant: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCH ,  SINGAPORE UNIVERSITY OF TECHNOLOGY AND DESIGN

Inventor： Mohamed ASBAHI ,  Kwang Wei Joel YANG ,  Junhao TAN ,  Shafigh MEHRAEEN ,  Mei Chee TAN

IPC: B05D1/18

CPC classification number: B05D1/18 ,  B82Y30/00 ,  B82Y40/00

Abstract: The present invention relates to methods for producing a composite material comprising a substrate and a monolayer of nanoparticles self-assembled thereupon, the method comprising: (i) providing a suspension comprising a solvent and nanoparticles dispersed therein; (ii) providing a substrate comprising a surface with void spaces for accommodating said nanoparticles; (iii) contacting one end of said substrate with said suspension in a closed system, to thereby gradually dispose said suspension over said substrate by capillary action, thereby forming a film of suspension on said substrate; and (iv) allowing evaporation of said film of suspension, thereby forming a monolayer of nanoparticles self-assembled in said void spaces on said surface of the substrate. The present invention also relates to composite material produced by the methods disclosed herein.