Twofold optical display and encryption of binary and grayscale images with a wavelength-multiplexed metasurface

Author:

Zhang Xiaoyi1,Cheng Jiaqi2,Yue Wenjing1,Li Zhancheng2,Choi Duk-Yong3,Li Yang4ORCID,Li Hongliang5,Lee Sang-Shin5ORCID,Chen Shuqi2ORCID,Gao Song1ORCID

Affiliation:

1. School of Information Science and Engineering, Shandong Provincial Key Laboratory of Network Based Intelligent Computing , University of Jinan , Jinan 250022 , China

2. School of Physics and TEDA Institute of Applied Physics , Nankai University , Tianjin 300071 , China

3. Laser Physics Centre, Research School of Physics , Australian National University , Canberra , ACT 2601 , Australia

4. School of Microelectronics , Shandong University , Jinan 250101 , China

5. Department of Electronic Engineering, Nano Device Application Center , Kwangwoon University , Seoul 01897 , Republic of Korea

Abstract

Abstract The remarkable capability in regulating light polarization or amplitude at the nanoscale makes metasurface a leading candidate in high-resolution image display and optical encryption. Diverse binary or grayscale meta-images were previously shown concealed in a single metasurface, yet they are mostly stored at same encryption level and share an identical decryption key, running the risk of exposing all images once the key is disclosed. Here, we propose a twofold optical display and encryption scheme demonstrating that binary and grayscale meta-images can be concurrently embedded in a nonspatially multiplexed silicon metasurface, and their decryptions demand for drastically different keys. Unlike previous metasurfaces relying on isolated transmission or phase manipulations upon orthogonal linear polarization incidences, this is made possible by exploiting silicon meta-atoms featuring joint transmission amplitude and polarization control at two wavelengths. In detail, the selected two meta-atoms exhibit large polarization-independent transmission difference (∼85 %) at a wavelength of 800 nm, while functioning as the nano-quarter-wave plate at wavelength of 1200 nm. Through elaborate design in simulation, a binary image can be witnessed when the metasurface is merely illuminated by an unpolarized light of wavelength 800 nm or under white light illumination. However, a distinct binary or grayscale image will come into view by inspecting the metasurface with an analyzer and when the incident light is circularly polarized at the wavelength of 1200 nm. Two metasurface samples are fabricated and successfully verified the claims experimentally. The proposed approach is expected to bring new insights to the field of optical display and encryption.

Funder

Natural Science Foundation of Shandong Province

National Natural Science Foundation of China

Ministry of Science and ICT, South Korea

National Research Foundation of Korea

Publisher

Walter de Gruyter GmbH

Subject

Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials,Biotechnology

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