Liquid Crystal Templated Chiral Plasmonic Films with Dynamic Tunability and Moldability,Advanced Functional Materials

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Liquid Crystal Templated Chiral Plasmonic Films with Dynamic Tunability and Moldability
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-01-09 , DOI: 10.1002/adfm.202111280
Dorota Grzelak ₁ , Martyna Tupikowska ₁ , David Vila‐Liarte _{2,

3} , Dominik Beutel ₄ , Maciej Bagiński ₁ , Sylwia Parzyszek ₁ , Monika Góra ₁ , Carsten Rockstuhl _{4,

5} , Luis M. Liz‐Marzán _{2,

3,

6} , Wiktor Lewandowski ₁

Affiliation

Thin films sustaining plasmonic circular dichroism (PCD) have acquired high scientific relevance and a great potential for applications. While most efforts in PCD thin film structures focus on lithographically fabricated static metasurfaces, the bottom-up fabrication of active chiral plasmonic films constitutes an alternative approach. Herein, the preparation of PCD thin films by melting and freezing a mixture of liquid crystal (LC), a chiral dopant, and gold nanoparticles (Au NPs), serving as helical matrix, symmetry breaking inducer, and plasmonic component, respectively is reported. UV–vis and circular dichroism spectroscopies, as well as theoretical modeling are used to disclose the interactions among thin film components, toward maximizing the PCD dissymmetry factor (g-factor). Variation of substrate temperature affords reversible off/on switching of the chiroptical response. The soft nature of LC matrix enables patterning of the films via a thermal nanoimprinting method, using a polydimethylsiloxane mold for transfer-printing onto a flexible substrate, leading to stretchable PCD films. The PCD wavelengths can be readily tuned by varying the geometry of the Au NPs. This work provides an efficient technique to produce PCD thin films with active plasmonic properties and mechanical tunability.

中文翻译：

具有动态可调性和可塑性的液晶模板手性等离子体薄膜

维持等离子体圆二色谱 (PCD) 的薄膜已获得高度的科学相关性和巨大的应用潜力。虽然 PCD 薄膜结构中的大多数努力都集中在光刻制造的静态超表面上，但自下而上制造活性手性等离子体薄膜构成了一种替代方法。本文报道了通过熔化和冷冻液晶 (LC)、手性掺杂剂和金纳米粒子 (Au NPs) 的混合物来制备 PCD 薄膜，分别用作螺旋基质、对称破坏诱导剂和等离子体成分。紫外-可见光谱和圆二色光谱以及理论建模用于揭示薄膜成分之间的相互作用，以最大化 PCD 不对称因子（g 因子）。衬底温度的变化提供了手性响应的可逆关闭/打开切换。LC 矩阵的柔软特性可以通过热纳米压印方法对薄膜进行图案化，使用聚二甲基硅氧烷模具转移印刷到柔性基板上，从而产生可拉伸的 PCD 薄膜。通过改变 Au NP 的几何形状，可以很容易地调整 PCD 波长。这项工作提供了一种有效的技术来生产具有活性等离子体特性和机械可调性的 PCD 薄膜。

更新日期：2022-01-09

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