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Tunable Plasmonic Nanohole Arrays Actuated by a Thermoresponsive Hydrogel Cushion
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2015-12-22 00:00:00 , DOI: 10.1021/acs.jpcc.5b10336
Nityanand Sharma 1, 2 , Hamid Keshmiri 1 , Xiaodong Zhou 3 , Ten It Wong 3 , Christian Petri 1, 4 , Ulrich Jonas 4 , Bo Liedberg 2 , Jakub Dostalek 1
Affiliation  

New plasmonic structure with actively tunable optical characteristics based on thermoresponsive hydrogel is reported. It consists of a thin, template-stripped Au film with arrays of nanoholes that is tethered to a transparent support by a cross-linked poly(N-isopropylacrylamide) (pNIPAAm)-based polymer network. Upon a contact of the porous Au surface with an aqueous environment, a rapid flow of water through the pores enables swelling and collapsing of the underlying pNIPAAm network. The swelling and collapsing could be triggered by small temperature changes around the lower critical solution temperature (LCST) of the hydrogel. The process is reversible, and it is associated with strong refractive index changes of Δn ∼ 0.1, which characteristically alters the spectrum of surface plasmon modes supported by the porous Au film. This approach can offer new attractive means for optical biosensors with flow-through architecture and actively tunable plasmonic transmission optical filters.

中文翻译:

可调节等离子纳米孔阵列由热敏水凝胶垫层驱动。

报道了基于热响应水凝胶的具有主动可调光学特性的新型等离激元结构。它由具有模板孔的薄Au膜组成,该膜具有纳米孔阵列,该纳米孔通过交联的基于聚N-异丙基丙烯酰胺(pNIPAAm)的聚合物网络拴接到透明支撑体上。当多孔Au表面与水性环境接触时,水通过孔的快速流动能够使下面的pNIPAAm网络溶胀和塌陷。水凝胶的较低临界溶液温度(LCST)附近的较小温度变化可能触发溶胀和塌陷。该过程是可逆的,并且与Δn的强折射率变化有关约0.1,这特征性地改变了由多孔金膜支撑的表面等离激元模的光谱。这种方法可以为具有流通结构和有源可调等离子体传输光学滤波器的光学生物传感器提供新的有吸引力的手段。
更新日期:2015-12-22
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