Stretchable All-Dielectric Metasurfaces with Polarization-Insensitive and Full-Spectrum Response.,ACS Nano

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Stretchable All-Dielectric Metasurfaces with Polarization-Insensitive and Full-Spectrum Response.
ACS Nano ( IF 15.8 ) Pub Date : 2020-01-09 , DOI: 10.1021/acsnano.9b08228
Chen Zhang ₁ , Jixiang Jing ₁ , Yunkai Wu ₁ , Yubin Fan ₁ , Wenhong Yang ₁ , Shuai Wang ₁ , Qinghai Song _{1,

2} , Shumin Xiao _{1,

2}

Affiliation

Mechanical stretching has been an effective way to achieve widely tunable optical response in artificial nanostructures. However, the typical stretchable optical devices produce exactly the reverse effects for two orthogonal linear polarizations, significantly hindering their practical applications in many emerging systems. Herein, we demonstrate an approach for a mechanically tunable all-dielectric metasurface with polarization insensitivity and full-spectrum response in the visible range from 450 to 650 nm. By embedding a TiO2 metasurface in a polydimethylsiloxane substrate and stretching it in one direction, we find that the distinct reflection colors of two orthogonal linear polarizations can be tuned across the entire visible spectrum simultaneously. Encryption and display of information have also been realized with the same technique. The corresponding calculations show that the spectral responses of light with polarizations perpendicular and parallel to the strain are determined by two different mechanisms, that is, the near-field mutual interaction and the grating effects. This research shall shed light on stretchable and wearable photonics.

中文翻译：

具有极化不敏感和全光谱响应的可拉伸全介电超表面。

机械拉伸一直是在人造纳米结构中实现广泛可调的光学响应的有效方法。然而，典型的可拉伸光学装置恰好对两个正交线性偏振产生相反的效果，从而极大地阻碍了它们在许多新兴系统中的实际应用。在本文中，我们展示了一种在450至650 nm可见光范围内具有极化不灵敏性和全光谱响应的机械可调全介电超表面的方法。通过将TiO2超颖表面嵌入聚二甲基硅氧烷衬底中并在一个方向上拉伸，我们发现可以在整个可见光谱范围内同时调整两个正交线性偏振的不同反射颜色。信息的加密和显示也已经用相同的技术实现。相应的计算表明，偏振垂直和平行于应变的光的光谱响应是由两种不同的机制决定的，即近场相互作用和光栅效应。这项研究将为可伸缩和可穿戴的光子学提供启发。

更新日期：2020-01-09

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