Optical Security Device Providing Color Switching Or Image Switching Effect

An optical security feature has pixels with faceted microstructures supporting nano-patterned optical filters. Each of the pixels includes a substrate and a nanostructure. The substrate is configured to emit light of at least a first wavelength and a second wavelength different than the first wavele...

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Bibliographic Details
Main Authors Khoshnegar Shahrestani, Milad, Landrock, Clint K, Nahvi, Ehsan
Format Patent
LanguageEnglish
Published 27.06.2024
Subjects
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BOOKBINDING
DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDEDFOR
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LOOSE LEAVES
MOVABLE-STRIP WRITING OR READING APPARATUS
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PERFORMING OPERATIONS
PHYSICS
PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITYFEATURES
PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOTOTHERWISE PROVIDED FOR
SPECIAL PRINTED MATTER
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Summary:An optical security feature has pixels with faceted microstructures supporting nano-patterned optical filters. Each of the pixels includes a substrate and a nanostructure. The substrate is configured to emit light of at least a first wavelength and a second wavelength different than the first wavelength. The microstructure includes a first facet, a second facet non-parallel to the first facet, a first nano-patterned optical filter disposed on the first facet, and a second nano-patterned optical filter disposed on the second facet. The first nano-patterned optical filter includes a first stopband that includes the first wavelength and excludes the second wavelength. The second nano-patterned optical filter includes a second stopband that includes the second wavelength and excludes the first wavelength. For each pixel, the first nano-patterned optical filter inhibits emission of light at the first wavelength from the pixel via the first facet.
Bibliography:Application Number: US202418600714