Anti-counterfeiting visible metaholograms multiplexed with spin, direction, and wavelengths

Inki Kim; Junsuk Rho

doi:10.1117/12.2566355

22 August 2020 Anti-counterfeiting visible metaholograms multiplexed with spin, direction, and wavelengths

Inki Kim, Junsuk Rho

Proceedings Volume 11460, Metamaterials, Metadevices, and Metasystems 2020; 114601O (2020) https://doi.org/10.1117/12.2566355
Event: SPIE Nanoscience + Engineering, 2020, Online Only

Conference Poster

Abstract

In this abstract, I will discuss our efforts in realizing multifunctional metaholograms that can encode multiple pieces of information in a monolayer device for anticounterfeiting applications. First, I will present a spin-multiplexed visible metahologram [1]. A straightforward method for encoding multiple pieces of information in a single metahologram device is using polarization. To obtain significant birefringence for the control and reversal of photon spin, two sets of nanorods are designed, and depending on their orientation, they imprint inversed spin photons along their corresponding geometrical phase. As a result, this allows switching between two different images by simply flipping the handedness of the circularly polarized light on the transmission-type metahologram with 61% diffraction efficiency. Second, I will introduce a direction-multiplexed visible metahologram [2]. This approach is to multiplex two distinct pieces of information onto a monolayer metahologram operating in the forward and backward directions depending on the direction of light incident on the device. Particularly, in this part we will reveal underlying physics of high transmission efficiency (around 75%), which is the antiferromagnetic resonances in the a-Si:H nanorod. Finally, I will propose a wavelength-multiplexed visible/NIR switchable metahologram. The device consists of a-Si:H and gold (Au) metasurfaces in a monolayer device, which is fabricated by the electron beam lithography overlay process [3]. The a-Si:H metasurfaces generate a visible hologram and the Au metasurfaces produce a invisible(NIR) hologram simultaneously with low crosstalk. I believe our efforts for making a multiplexed metahologram will lead to pragmatic anticounterfeiting applications.

Citation Download Citation

Inki Kim and Junsuk Rho "Anti-counterfeiting visible metaholograms multiplexed with spin, direction, and wavelengths", Proc. SPIE 11460, Metamaterials, Metadevices, and Metasystems 2020, 114601O (22 August 2020); https://doi.org/10.1117/12.2566355

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