Tuyen Le Dac, Liu An Chi, Huang Chia-Chi, Tsai Pei-Cheng, Lin Jian Hung, Wu Chin-Wei, Chau Lai-Kwan, Yang Tzyy Schiuan, Minh Le Quoc, Kan Hung-Chih, Hsu Chia Chen
Department of Physics, National Chung Cheng University, Ming Hsiung, Chia Yi 621, Taiwan.
Opt Express. 2012 Dec 31;20(28):29266-75. doi: 10.1364/OE.20.029266.
We present a novel type of surface-enhanced Raman scattering (SERS) substrate constituted of a 3-dimensinal polymeric inverse opal (IO) photonic crystal frame with gold nanorods (Au-NRs) decorating on the top layer. This substrate employs resonant excitation as well as constructive backward scattering of Raman signals to produce large enhancement of SERS output. For the incoming excitation, Au-NRs with appropriate aspect ratio were adopted to align their longitudinal localized surface plasmon band with the excitation laser wavelength. For the outgoing SERS signal, the spectral position of the photonic band gap was tuned to reflect Raman-scattered light constructively. This SERS substrate produces not only strong but also uniform SERS output due to the well control of Au-NRs distribution by the periodic IO structure, readily suitable for sensing applications.
我们展示了一种新型的表面增强拉曼散射（SERS）基底，它由三维聚合物反蛋白石（IO）光子晶体框架构成，顶层装饰有金纳米棒（Au-NRs）。该基底采用共振激发以及拉曼信号的相长后向散射来大幅增强SERS输出。对于入射激发，采用具有适当纵横比的Au-NRs，使其纵向局域表面等离子体带与激发激光波长对齐。对于出射的SERS信号，调整光子带隙的光谱位置以相长地反射拉曼散射光。由于周期性IO结构对Au-NRs分布的良好控制，这种SERS基底不仅能产生强烈且均匀的SERS输出，非常适合传感应用。
