TY - JOUR
T1 - Polarization-multiplexed metaholograms with erasable functionality
AU - Zhou, Shaolin
AU - Liu, Liang
AU - Chen, Zhijian
AU - Ansari, Muhammad Afnan
AU - Chen, Xianzhong
AU - Chan, Mansun
N1 - Funding Information:
This research was funded by Guangdong Provincial Natural Science Foundation (Grant Number 2022A1515010872). It was also partially funded by ACCESS—AI Chip Center for Emerging Smart Systems, sponsored by Innovation and Technology Fund (ITF), Hong Kong SAR.
Publisher Copyright:
© 2023 IOP Publishing Ltd.
PY - 2023/4/13
Y1 - 2023/4/13
N2 - The unprecedented capability of metasurfaces in pixel-wise-level accurate light manipulation has enabled the realization of polarization-multiplexed metasurface holograms in a single or multiple channel. However, most metasurfaces are static and unable to realize active or tunable wave control in many scenarios. We introduce an erasable functionality for multi-channel metasurface holograms based on active phase tuning, which is realized using the nonvolatile chalcogenide phase change alloy of GeSbSeTe (GSST). Upon the incidence of linearly or circularly polarized waves, polarization-dependent holograms constructed using amorphous GSST (a-GSST) elliptical pillars are achieved because of the complete phase control. The a-GSST holograms feature a subwavelength spatial resolution for all elliptical pillars, with local transmittances ranging from 66% to 90%. Benefiting from the amorphous-to-crystalline phase transition of GSST, the hologram functionality can be completely erased because the crystallized pillars cannot provide the effective propagation modes required by the anisotropic phase modulations in the operating wavelength range. The unique properties of the proposed polarization-multiplexed holograms with erasable functionality offer more degrees of freedom and have potential applications in many fields, such as anti-counterfeiting, encryption, and holographic sources.
AB - The unprecedented capability of metasurfaces in pixel-wise-level accurate light manipulation has enabled the realization of polarization-multiplexed metasurface holograms in a single or multiple channel. However, most metasurfaces are static and unable to realize active or tunable wave control in many scenarios. We introduce an erasable functionality for multi-channel metasurface holograms based on active phase tuning, which is realized using the nonvolatile chalcogenide phase change alloy of GeSbSeTe (GSST). Upon the incidence of linearly or circularly polarized waves, polarization-dependent holograms constructed using amorphous GSST (a-GSST) elliptical pillars are achieved because of the complete phase control. The a-GSST holograms feature a subwavelength spatial resolution for all elliptical pillars, with local transmittances ranging from 66% to 90%. Benefiting from the amorphous-to-crystalline phase transition of GSST, the hologram functionality can be completely erased because the crystallized pillars cannot provide the effective propagation modes required by the anisotropic phase modulations in the operating wavelength range. The unique properties of the proposed polarization-multiplexed holograms with erasable functionality offer more degrees of freedom and have potential applications in many fields, such as anti-counterfeiting, encryption, and holographic sources.
KW - active control
KW - hologram
KW - metasurface
KW - phase change materials
UR - http://www.scopus.com/inward/record.url?scp=85150383480&partnerID=8YFLogxK
U2 - 10.1088/1361-6463/acbf61
DO - 10.1088/1361-6463/acbf61
M3 - Article
AN - SCOPUS:85150383480
SN - 0022-3727
VL - 56
JO - Journal of Physics D: Applied Physics
JF - Journal of Physics D: Applied Physics
IS - 15
M1 - 155102
ER -