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.

Abstract: This application relates to a method of forming nano-patterns on a substrate comprising the step of forming a plurality of nanostructures on a dielectric substrate, wherein the nanostructures are dimensioned or spaced apart from each other by a scaling factor of the dielectric substrate with reference to a silicon substrate.

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.

Abstract: This application relates to a method of forming nano-patterns on a substrate comprising the step of forming a plurality of nanostructures on a dielectric substrate, wherein the nanostructures are dimensioned or spaced apart from each other by a scaling factor of the dielectric substrate with reference to a silicon substrate. There is also provided a method of forming a nano-patterned substrate comprising the step of forming a plurality of nanostructures on a dielectric substrate, wherein said dielectric substrate comprises an anti-reflectance layer disposed on a base substrate.

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.

Abstract: According to embodiments of the present invention, a method of writing to an optical data storage medium is provided. The method includes receiving a plurality of data elements, each data element having one of a plurality of values, wherein each value of the plurality of values is associated with a wavelength, and forming, for each data element, a nanostructure arrangement on the optical data storage medium, the nanostructure arrangement configured to reflect light of the wavelength associated with the value of the data element in response to a light irradiated on the optical data storage medium. According to further embodiments of the present invention, a method of reading from an optical data storage medium and an optical data storage medium are also provided.

Abstract: According to embodiments of the present invention, a method of writing to an optical data storage medium is provided. The method includes receiving a plurality of data elements, each data element having one of a plurality of values, wherein each value of the plurality of values is associated with a wavelength, and forming, for each data element, a nanostructure arrangement on the optical data storage medium, the nanostructure arrangement configured to reflect light of the wavelength associated with the value of the data element in response to a light irradiated on the optical data storage medium. According to further embodiments of the present invention, a method of reading from an optical data storage medium and an optical data storage medium are also provided.