Flexible photonic crystals for strain sensing
Flexible photonic crystals for strain sensing
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DOI：
10.1016/j.optmat.2010.09.024
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发表时间：
2011-01-01
影响因子：
3.9
通讯作者：
Almeida, Rui M.
中科院分区：
文献类型：
--
作者：
Fortes, Luis M.;Clara Goncalves, M.;Almeida, Rui M.
基于应变诱导阻带频移的三维光子晶体（PCs）作为应变传感材料已被研究。聚苯乙烯微球的自组装是通过在柔性聚酰亚胺带基板上沉淀实现的，其表面亲水性经过优化，以达到最大的润湿性，从而产生了有组织的3-D直接蛋白石模板。通过浸渍涂层或化学气相沉积的方法将硅溶胶-凝胶溶液渗透到该材料中，并通过化学溶解聚合物模板最终获得反蛋白石结构。利用扫描电镜（FE-SEM）和紫外/可见光谱学研究了不同应变程度下这些pc的结构和光学性能。FE-SEM显示了高达30 μ m(2)的有序结构域的存在。直接、渗透和反蛋白石的光子停止带峰值波长在传输模式下发生了应变引起的位移，最大位移达50 nm，这是由于柔性蛋白石弯曲时平面间距的变化所引起的。研究了光响应应变周期，提出了这些结构在集成在传感器/执行器器件中的可逆光子应变传感器中的可能应用。(C) 2010 Elsevier B.V.版权所有
Three-dimensional (3-D) photonic crystals (PCs) have been studied as possible strain sensing materials, based on strain-induced stop band frequency shifting. Self-assembly of polystyrene microspheres, achieved by sedimentation over a flexible polyimide tape substrate whose surface hydrophilicity was optimized in order to achieve maximum wettability, led to an organized 3-D direct opal template. This was infiltrated with a silica sol-gel solution by dip-coating or by chemical vapour deposition and an inverse opal structure was ultimately obtained by chemical dissolution of the polymer template. The structural and optical properties of these PCs have been studied by scanning electron microscopy (FE-SEM) and UV/visible spectroscopy under variable degrees of strain. FE-SEM showed the presence of ordered domains up to similar to 30 mu m(2). A mechano-optical effect was evidenced by strain-induced shifting of the photonic stop band peak wavelength of the direct, infiltrated and inverse opals up to 50 nm in transmission mode, due to changes in interplanar spacing upon bending the flexible PCs. Optical response strain cycles were studied, suggesting the possible use of these structures in reversible photonic strain sensors integrated in sensor/actuator devices. (C) 2010 Elsevier B.V. All rights reserved.