Flexible photonic crystals for strain sensing

被引:32
|
作者
Fortes, Luis M. [1 ]
Clara Goncalves, M. [1 ]
Almeida, Rui M. [1 ]
机构
[1] Univ Tecn Lisboa, Dept Engn Mat ICEMS, Inst Super Tecn, P-1049001 Lisbon, Portugal
关键词
Photonic crystal; Photonic band gap; Colloids; Strain sensor; Opals; COLLOIDAL CRYSTALS; OPTICAL-PROPERTIES; SENSORS; OPTIMIZATION; OPALS; GEL;
D O I
10.1016/j.optmat.2010.09.024
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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.
引用
收藏
页码:408 / 412
页数:5
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