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<p>This study introduces a multi-layer grating device aimed at enhancing color stability in tunable structural color and optical encryption. The device ensures both transmission efficiency and stability within the microfluidic tuning system by incorporating transition and protective layers, along with an amplified grating period. Analytical results demonstrate that the combined effect of surface plasmon waves (SPW) between the multi-layer films generates the full color spectrum solely by altering the grating period. This grating period has been effectively expanded to approximate the intended color band. Compared to single-layer gratings, the period has increased by 238%, and for multi-layer gratings, it has increased by 147%. Nanometal gratings with periods of 400, 500, and 600 nm successfully produce primary colors, with respective transmittance rates of 75.8%, 75.9%, and 71.8%. Additionally, we propose an FDTD simulation method using two orthogonally polarized Gaussian light sources to model more scenarios. The dynamic structural color capabilities of these devices in the context of microfluidics hold promising potential for applications in optical encryption and could be easier to manufacture due to the larger grating period, making the process more cost-effective compared to existing devices.</p>

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Microfluidics Implemented High Stability Tunable Structural Color Device for Display and Optical Encryption

  • 期刊论文

  • 发表日期：

    2025年2月5日

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  • Gangjie Chen,
  • Xingke Zheng,
  • Yun Ye,
  • Tianning Zhang,
  • Jiaqi Gao,
  • Sheng Xu,
  • Tailiang Guo,
  • Enguo Chen

摘要

This study introduces a multi-layer grating device aimed at enhancing color stability in tunable structural color and optical encryption. The device ensures both transmission efficiency and stability within the microfluidic tuning system by incorporating transition and protective layers, along with an amplified grating period. Analytical results demonstrate that the combined effect of surface plasmon waves (SPW) between the multi-layer films generates the full color spectrum solely by altering the grating period. This grating period has been effectively expanded to approximate the intended color band. Compared to single-layer gratings, the period has increased by 238%, and for multi-layer gratings, it has increased by 147%. Nanometal gratings with periods of 400, 500, and 600 nm successfully produce primary colors, with respective transmittance rates of 75.8%, 75.9%, and 71.8%. Additionally, we propose an FDTD simulation method using two orthogonally polarized Gaussian light sources to model more scenarios. The dynamic structural color capabilities of these devices in the context of microfluidics hold promising potential for applications in optical encryption and could be easier to manufacture due to the larger grating period, making the process more cost-effective compared to existing devices.