journal article·2024-10Open access

Wide‐Angled Pragmatic Dielectric Chiral Meta‐Platform for Spin‐ and Wavelength‐Multiplexed Holography in the Ultraviolet and Visible

Aqsa Asad, Junhwa Seong, Hafiz Saad Khaliq, Jae‐Won Lee, Youngsun Jeon, Humberto Cabrera, Muhammad Qasim Mehmood, Lei Gao, Hak‐Rin Kim, Junsuk Rho

Advanced Functional Materials· Volume 34· Issue 41

Abstract

Abstract A chiral meta‐optics platform that incorporates hologram‐multiplexing with low phase distortion and wide‐incident angle tolerance over the broad spectral range of the ultraviolet‐visible (UV–vis) regimes holds great potential for photonic‐encryption‐based applications, particularly in next‐generation 3D displays, high‐resolution biomedical imaging, holographic anti‐counterfeiting labeling, and multi‐channel optical communication. However, the design incorporating giant chirality from UV–vis wavelengths coupled with wide‐incident‐angle tolerance and cost‐effective fabrication is still challenging. Here, the study introduces a pragmatic multifunctional dielectric chiral meta‐platform designed for simultaneous spin‐ and wavelength‐multiplexing of optical information in the UV–vis spectrum. The unit cell comprises a dimer structure based on wide‐bandgap silicon nitride (SiNx), ensuring substantial dual‐spectrum chiro‐optical effects. The meticulously engineered chiral meta‐platform offers an incident angle tolerance of up to 40 degrees, coupled with significant chiro‐optical transmission. To demonstrate the concept, two distinct phase profiles are embedded in the meta‐platform, utilizing the spin and wavelength of incident light as keys to unlock the specific holographic information. The chiral meta‐platform is experimentally validated for oblique illumination angles, showcasing its adaptability across the UV–vis spectrum. The demonstrated meta‐device with dual‐spectrum visual encryption can be applied in various anti‐counterfeiting and security applications.
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Research context

OpenAlex topics: Metamaterials and Metasurfaces Applications · Liquid Crystal Research Advancements · Advanced Optical Imaging Technologies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Electronic and Electrical Engineering Kyungpook National University Daegu 41566 Republic of Korea

Department of Mechanical Engineering Pohang University of Science and Technology (POSTECH) Pohang 37673 Republic of Korea

MLab, STI Unit The Abdus Salam International Centre for Theoretical Physics Trieste 34151 Italy

School of Optical and Electronic Information Suzhou City University Suzhou 215104 China

MicroNano Lab, Department of Electrical Engineering Information Technology University of the Punjab (ITU) Lahore 54000 Pakistan

School of Physical Science and Technology & Collaborative Innovation Center of Suzhou Nano Science and Technology & Jiangsu Key Laboratory of Frontier Material Physics and Devices Soochow University Suzhou 215006 China

Suzhou Key Laboratory of Biophotonics Suzhou City University Suzhou 215006 China

School of Electronics Engineering Kyungpook National University Daegu 41566 Republic of Korea

Department of Chemical Engineering Pohang University of Science and Technology (POSTECH) Pohang 37673 Republic of Korea

Department of Electrical Engineering Pohang University of Science and Technology (POSTECH) Pohang 37673 Republic of Korea

POSCO‐POSTECH‐RIST Convergence Research Center for Flat Optics and Metaphotonics Pohang 37673 Republic of Korea

National Institute of Nanomaterials Technology (NINT) Pohang 37673 Republic of Korea

Funding

National Research Foundation of Korea · National Natural Science Foundation of China · Natural Science Foundation of Jiangsu Province

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