Study on anomalous transmission switching of all⁃dielectric metasurfaces based on flexible substrates

doi:10.3969/j.issn.1007-5461.2026.01.013

Abstract

Abstract: This study presents an all-dielectric TiO2 metasurface fabricated on a flexible polydimethylsiloxane substrate. And through geometric parameter optimization, the metasurface can achieve efficient anomalous transmission control within the visible spectrum. The electromagnetic response of the metasurface is analyzed at a wavelength of 405 nm, and a nearly complete phase coverage and an average transmittance exceeding 85% (with a peak of 99%) are achieved by adjusting the side length of the nanopillars. Theoretical calculations and simulation results show that this structure can generate a stable anomalous transmission angle (9.6º) under normal incidence condition, and its phase gradient is highly consistent with the generalized Snell's law. Further research indicates that mechanical strain can be applied to dynamically tune the transmission characteristics, enabling reversible switching between "ON" (anomalous transmission) and "OFF" (anomalous transmission disabled) states. Additionally, the designed composite gradient metasurface (featuring upper layers with increasing gradients and lower layers with decreasing gradients) based on the anomalous transmission characteristics of TiO2 metasurface exhibits unique capabilities for electric field distribution manipulation, offering a new approach combining broadband response and high transmission efficiency for applications like electromagnetic transparency and radomes. This research provides a theoretical basis and experimental reference for the design of flexible, tunable photonic devices.

Key words: physical optics, anomalous transmission, phase gradient, all-dielectric metasurface

CLC Number:

O431.2

WANG Yulin , YANG Zhen , XU Yanli , ZHAO Hong . Study on anomalous transmission switching of all⁃dielectric metasurfaces based on flexible substrates[J]. Chinese Journal of Quantum Electronics, 2026, 43(1): 151-160.

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