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Keywords = spin-decoupled CP control

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15 pages, 6557 KB  
Article
A Multifunctional Reconfigurable Terahertz Metasurface Enabling Spin-Decoupled Logic Operations and Holography
by Zou Long and Zhengji Xu
Materials 2025, 18(18), 4362; https://doi.org/10.3390/ma18184362 - 18 Sep 2025
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Abstract
We present a multifunctional, reconfigurable terahertz metasurface built from dual split-ring resonators combining photosensitive silicon and metallic elements. By hybridizing structural and Pancharatnam–Berry phase control, the device achieves spin-decoupled manipulation of circularly polarized wavefronts and an optical, light-intensity-driven reconfiguration mechanism. Using spatially encoded [...] Read more.
We present a multifunctional, reconfigurable terahertz metasurface built from dual split-ring resonators combining photosensitive silicon and metallic elements. By hybridizing structural and Pancharatnam–Berry phase control, the device achieves spin-decoupled manipulation of circularly polarized wavefronts and an optical, light-intensity-driven reconfiguration mechanism. Using spatially encoded bifocal responses, we implement two two-input/two-output logic modules (OR-XOR and AND-NAND), and full-wave simulations verify the expected truth-table behaviors; additionally, a spin- and intensity-dependent hologram produces four distinct far-field images under different input conditions. At the selected working point (≈0.95 THz), the design exhibits a strong cross-polarization response (cross-polarized reflection amplitude > 0.7), demonstrating a viable route toward chip-scale, integrated terahertz logic and multifunctional imaging devices. Full article
(This article belongs to the Special Issue Advances in Nanophotonic Materials, Devices, and Applications)
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