Photonics Research, 2015, 3 (6): 06000313, Published Online: Jan. 6, 2016
Tunable double-resonance dimer structure for surface-enhanced Raman scattering substrate in near-infrared region Download: 1000次
Abstract
Plasmonic resonance with Fano lineshape has attracted a great deal of recent interest. Here we design a new structure with a dimer grating upon a gold film separated by a layer of silica spacer, which has two resonant modes corresponding to the dimer’s localized surface plasmon resonance and the surface plasmon resonance excited by the dimer grating. This structure has three advantages for near-infrared detection in water. First, it provides two resonant modes to enhance the excitation and scattered signals of surface-enhanced Raman scattering. Second, coupling of these two modes results in a Fano resonance, providing a higher electric field enhancement. Finally, the dimer provides more flexible tunability compared to a single disk structure.
Zhengqing Qi, Jie Yao, Liangliang Zhao, Yiping Cui, Changgui Lu. Tunable double-resonance dimer structure for surface-enhanced Raman scattering substrate in near-infrared region[J]. Photonics Research, 2015, 3(6): 06000313.