Thermoplasmonic‐Activated Hydrogel Based Dynamic Light Attenuator,Advanced Optical Materials

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Thermoplasmonic‐Activated Hydrogel Based Dynamic Light Attenuator
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-04-21 , DOI: 10.1002/adom.202000324
Filippo Pierini ₁ , Alexa Guglielmelli _{2,

3} , Olga Urbanek ₁ , Pawel Nakielski ₁ , Luigia Pezzi ₃ , Robert Buda ₄ , Massimiliano Lanzi ₅ , Tomasz A. Kowalewski ₁ , Luciano De Sio _{3,

6}

Affiliation

This work describes the morphological, optical, and thermo‐optical properties of a temperature‐sensitive hydrogel poly(N ‐isopropylacrylamide‐co ‐N ‐isopropylmethacrylamide) [P(NIPAm‐co ‐NIPMAm]) film containing a specific amount of gold nanorods (GNRs). The light‐induced thermoplasmonic heating of GNRs is used to control the optical scattering of an initially transparent hydrogel film. A hydrated P(NIPAm‐co ‐NIPMAm) film is optically clear at room temperature. When heated to temperatures over 37 °C via light irradiation with a resonant source (λ = 810 nm) to the GNRs, a reversible phase transition from a swollen hydrated state to a shrunken dehydrated state occurs. This phenomenon causes a drastic and reversible change in the optical transparency from a clear to an opaque state. A significant red shift (≈30 nm) of the longitudinal band can also be seen due to an increased average refractive index surrounding the GNRs. This change is in agreement with an ad hoc theoretical model which uses a modified Gans theory for ellipsoidal nanoparticles. Morphological analysis of the composite film shows the presence of well‐isolated and randomly dispersed GNRs. Thermo‐optical experiments demonstrate an all‐optically controlled light attenuator (65% contrast ratio) which can be easily integrated in several modern optical applications such as smart windows and light‐responsive optical attenuators.

中文翻译：

基于热等离子体激元活化的水凝胶的动态光衰减器

这项工作描述了形态学，光学和温度敏感性水凝胶的聚热光学性质（Ñ -isopropylacrylamide-共- ñ -isopropylmethacrylamide）[P（NIPAm-共-NIPMAm]）含有金纳米棒的特定量膜（ GNR）。GNRs的光诱导热等离子体加热用于控制最初透明的水凝胶薄膜的光散射。水合P（NIPAm-合作‐NIPMAm）膜在室温下是光学透明的。当通过共振源（λ= 810 nm）的光照射到GNRs加热到超过37°C的温度时，会发生从溶胀水合态到收缩脱水态的可逆相变。该现象导致光学透明性从透明状态到不透明状态的急剧且可逆的变化。由于环绕GNR的平均折射率增加，还可以看到纵向带显着的红移（≈30nm）。这种变化与一个特殊的理论模型相一致，该理论模型对椭圆形纳米颗粒使用了改进的Gans理论。复合膜的形态分析表明存在分离良好的GNR和随机分散的GNR。

更新日期：2020-06-19

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