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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Polarized Optomechanical Response of Silver Nanodisc Mono layers on an Elastic Substrate Induced by Stretching
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Polarized Optomechanical Response of Silver Nanodisc Mono layers on an Elastic Substrate Induced by Stretching

机译：拉伸引起的弹性基底上银纳米圆盘单层的偏振光机械响应

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摘要

A monolayer assembly of silver nanodisks (AgNDs) was fabricated on the surface of a polydimethylsiloxane (PDMS) polymer substrate using the Langmuir-Blodgett technique. Upon stretching the PDMS substrate, the localized surface plasmon resonance (LSPR) spectrum of the AgND monolayer is blue-shifted when the incident light excitation is polarized parallel to the stretching direction. Conversely, a red shift in the LSPR spectrum of the AgND monolayer is observed in the case of light polarization orthogonal to the stretching direction. The magnitude of the shift in the LSPR spectrum is proportional to the degree of stretching of the PDMS substrate. Stretching PDMS in one direction causes its shrinking in the orthogonal direction. Consequently, the interparticle distance between individual AgNDs on the PDMS surface increases in the same direction as the mechanical stretching and simultaneously decreases in the orthogonal direction. The different optical responses of the AgND assembly on the surface of stretched PDMS when excited with different polarization directions is due to the changing strength of the plasmon field coupling, which is inversely proportional to the separation gap between the AgNDs. The experimentally measured LSPR spectra upon stretching the PDMS substrate to different lengths and varying the incident light polarization were confirmed using the discrete dipole approximation calculation technique. The same optical response was obtained for an AgND monolayer sandwiched between two PDMS substrates. Covering the surface of the AgND monolayer on the PDMS substrate with another PDMS layer on top eliminates their deformation after multiple stretching shrinking cycles and increases its chemical stability.
机译：使用Langmuir-Blodgett技术在聚二甲基硅氧烷（PDMS）聚合物基材的表面上制备了银纳米盘（AgNDs）的单层组件。在拉伸PDMS基板时，当入射光激发平行于拉伸方向偏振时，AgND单层的局部表面等离子体共振（LSPR）光谱会发生蓝移。相反，在与拉伸方向正交的光偏振的情况下，观察到AgND单层的LSPR光谱的红移。 LSPR谱图中位移的大小与PDMS基板的拉伸程度成正比。在一个方向上拉伸PDMS会导致其在正交方向上收缩。因此，PDMS表面上各个AgND之间的颗粒间距离沿与机械拉伸相同的方向增大，而同时沿正交方向减小。当以不同的偏振方向激发时，拉伸的PDMS表面上AgND组件的不同光学响应是由于等离激元场耦合强度的变化，这与AgND之间的分离间隙成反比。使用离散偶极近似计算技术，可以将PDMS衬底拉伸至不同长度并改变入射光的偏振，然后通过实验测量LSPR光谱。对于夹在两个PDMS衬底之间的AgND单层，获得了相同的光学响应。在顶部覆盖另一个PDMS层，覆盖PDMS衬底上的AgND单层表面，可以消除多个拉伸收缩循环后它们的变形，并提高其化学稳定性。

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