Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore, 117583, Singapore.
Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117576, Singapore.
Small. 2018 Feb;14(7). doi: 10.1002/smll.201702268. Epub 2017 Dec 14.
Surface plasmon-based photonics offers exciting opportunities to enable fine control of the site, span, and extent of mechanical harvesting. However, the interaction between plasmonic photothermic and piezoresponse still remains underexplored. Here, spatially localized and controllable piezoresponse of a hybrid self-polarized polymeric-metallic system that correlates to plasmonic light-to-heat modulation of the local strain is demonstrated. The piezoresponse is associated to the localized plasmons that serve as efficient nanoheaters leading to self-regulated strain via thermal expansion of the electroactive polymer. Moreover, the finite-difference time-domain simulation and linear thermal model also deduce the local strain to the surface plasmon heat absorption. The distinct plasmonic photothermic-piezoelectric phenomenon mediates not only localized external stimulus light response but also enhances dynamic piezoelectric energy harvesting. The present work highlights a promising surface plasmon coordinated piezoelectric response which underpins energy localization and transfer for diversified design of unique photothermic-piezotronic technology.
基于表面等离激元的光子学为实现机械采集的位置、跨度和范围的精细控制提供了令人兴奋的机会。然而，等离子体光热与压电阻抗之间的相互作用仍未得到充分探索。在这里，展示了一种混合自极化聚合物-金属系统的空间局域和可控压电阻抗，该系统与局部应变的等离子体光致热调制相关。压电阻抗与局域等离激元相关，等离激元作为高效的纳米加热器，通过电活性聚合物的热膨胀导致自调节应变。此外，有限差分时间域模拟和线性热模型还将局部应变归结为表面等离激元的热吸收。明显的等离子体光热-压电现象不仅介导了局部外部刺激光响应，而且增强了动态压电能量收集。本工作突出了一种有前途的表面等离激元协调的压电响应，为独特的光热-压电器件技术的多样化设计提供了能量局域和转移的基础。
