All-Semiconductor Plasmonic Resonator for Surface-Enhanced Infrared Absorption Spectroscopy
All-Semiconductor Plasmonic Resonator for Surface-Enhanced Infrared Absorption Spectroscopy
复制标题
用于表面增强红外吸收光谱的全半导体等离子体谐振器
DOI:
10.3390/mi8010006
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发表时间:
2017-01-19
期刊:
影响因子:
3.4
通讯作者:
Tang L
中科院分区:
文献类型:
--
作者:
Wei W;Nong J;Jiang X;Chen N;Luo S;Tang L
Infrared absorption spectroscopy remains a challenge due to the weak light-matter interaction between micron-wavelengthed infrared light and nano-sized molecules. A highly doped semiconductor supports intrinsic plasmon modes at infrared frequencies, and is compatible with the current epitaxial growth processing, which makes it promising for various applications. Here, we propose an all-semiconductor plasmonic resonator to enhance the infrared absorption of the adsorbed molecules. An optical model is employed to investigate the effect of structural parameters on the spectral features of the resonator and the enhanced infrared absorption characteristics are further discussed. When a molecular layer is deposited upon the resonator, the weak molecular absorption signal can be significantly enhanced. A high enhancement factor of 470 can be achieved once the resonance wavelength of the resonator is overlapped with the desired vibrational mode of the molecules. Our study offers a promising approach to engineering semiconductor optics devices for mid-infrared sensing applications.
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