Thermally tunable binary-phase VO2 metasurfaces for switchable holography and digital encryption
Metasurface holography has aroused immense interest in producing holographic images with high quality, higher-order diffraction-free, and large viewing angles by using a planar artificial sheet consisting of subwavelength nanostructures. Despite remarkable progress, dynamically tunable metasurface h...
Main Authors: | , , |
---|---|
Format: | Article |
Language: | English |
Published: |
De Gruyter
2024-02-01
|
Series: | Nanophotonics |
Subjects: | |
Online Access: | https://doi.org/10.1515/nanoph-2023-0824 |
_version_ | 1797208532175552512 |
---|---|
author | Liao Yuan Fan Yulong Lei Dangyuan |
author_facet | Liao Yuan Fan Yulong Lei Dangyuan |
author_sort | Liao Yuan |
collection | DOAJ |
description | Metasurface holography has aroused immense interest in producing holographic images with high quality, higher-order diffraction-free, and large viewing angles by using a planar artificial sheet consisting of subwavelength nanostructures. Despite remarkable progress, dynamically tunable metasurface holography in the visible band has rarely been reported due to limited available tuning methods. In this work, we propose and numerically demonstrate a thermally tunable vanadium dioxide (VO2) nanofin based binary-phase metasurface, which generates holographic information in the visible varying with temperature. The insulator-to-metal phase transition in VO2 nanofins allows two independent binary-phase holograms generated by machine learning to be encoded in the respective phases of VO2 and switched under thermal regulation. By elaborately designing the dimensions and compensated phase of VO2 nanofins, high-quality images are reconstructed at corresponding temperatures under appropriate chiral illumination. In contrast, much poorer images are produced under inappropriate chiral illumination. We further demonstrate the advantage of applying the VO2 phase-compensated metasurface in high-security digital encryption, where two desired character combinations are read out with appropriate excitations and temperatures, whereas one identical fraudulent message is received with inappropriate excitations. Our design approach offers a new and efficient method to realize tunable metasurfaces, which is promisingly adopted in dynamic display, information encryption, optical anti-counterfeiting, etc. |
first_indexed | 2024-04-24T09:40:18Z |
format | Article |
id | doaj.art-c5f9e6f9cd324bfda25d97ece656cefa |
institution | Directory Open Access Journal |
issn | 2192-8614 |
language | English |
last_indexed | 2024-04-24T09:40:18Z |
publishDate | 2024-02-01 |
publisher | De Gruyter |
record_format | Article |
series | Nanophotonics |
spelling | doaj.art-c5f9e6f9cd324bfda25d97ece656cefa2024-04-15T07:42:04ZengDe GruyterNanophotonics2192-86142024-02-011371109111710.1515/nanoph-2023-0824Thermally tunable binary-phase VO2 metasurfaces for switchable holography and digital encryptionLiao Yuan0Fan Yulong1Lei Dangyuan2Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong, ChinaDepartment of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong, ChinaDepartment of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong, ChinaMetasurface holography has aroused immense interest in producing holographic images with high quality, higher-order diffraction-free, and large viewing angles by using a planar artificial sheet consisting of subwavelength nanostructures. Despite remarkable progress, dynamically tunable metasurface holography in the visible band has rarely been reported due to limited available tuning methods. In this work, we propose and numerically demonstrate a thermally tunable vanadium dioxide (VO2) nanofin based binary-phase metasurface, which generates holographic information in the visible varying with temperature. The insulator-to-metal phase transition in VO2 nanofins allows two independent binary-phase holograms generated by machine learning to be encoded in the respective phases of VO2 and switched under thermal regulation. By elaborately designing the dimensions and compensated phase of VO2 nanofins, high-quality images are reconstructed at corresponding temperatures under appropriate chiral illumination. In contrast, much poorer images are produced under inappropriate chiral illumination. We further demonstrate the advantage of applying the VO2 phase-compensated metasurface in high-security digital encryption, where two desired character combinations are read out with appropriate excitations and temperatures, whereas one identical fraudulent message is received with inappropriate excitations. Our design approach offers a new and efficient method to realize tunable metasurfaces, which is promisingly adopted in dynamic display, information encryption, optical anti-counterfeiting, etc.https://doi.org/10.1515/nanoph-2023-0824metasurface holographytunable metasurfacevanadium dioxidemachine learning optimizationinformation encryption |
spellingShingle | Liao Yuan Fan Yulong Lei Dangyuan Thermally tunable binary-phase VO2 metasurfaces for switchable holography and digital encryption Nanophotonics metasurface holography tunable metasurface vanadium dioxide machine learning optimization information encryption |
title | Thermally tunable binary-phase VO2 metasurfaces for switchable holography and digital encryption |
title_full | Thermally tunable binary-phase VO2 metasurfaces for switchable holography and digital encryption |
title_fullStr | Thermally tunable binary-phase VO2 metasurfaces for switchable holography and digital encryption |
title_full_unstemmed | Thermally tunable binary-phase VO2 metasurfaces for switchable holography and digital encryption |
title_short | Thermally tunable binary-phase VO2 metasurfaces for switchable holography and digital encryption |
title_sort | thermally tunable binary phase vo2 metasurfaces for switchable holography and digital encryption |
topic | metasurface holography tunable metasurface vanadium dioxide machine learning optimization information encryption |
url | https://doi.org/10.1515/nanoph-2023-0824 |
work_keys_str_mv | AT liaoyuan thermallytunablebinaryphasevo2metasurfacesforswitchableholographyanddigitalencryption AT fanyulong thermallytunablebinaryphasevo2metasurfacesforswitchableholographyanddigitalencryption AT leidangyuan thermallytunablebinaryphasevo2metasurfacesforswitchableholographyanddigitalencryption |