Feng Hui, Wang Li
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2011 Aug;31(8):2017-20.
The authors provided an analysis of the surface plasmon resonance sensor (SPRS) working at terahertz (THz) frequency with angular modulation and made a brief comparison between optical SPRS and THz-SPRS. At optical frequency, there is a dip in the angular reflection spectrum due to the resonant transfer of the energy carried by the incident light wave to surface plasmon, while there is an enhanced reflection peak at the terahertz frequency. The position of the peak is solely determined by the refractive indices of the prism and the sample, and independent of the properties of the metal film. Our results show that the determination of the dielectric constant of a sample in the THz SPRS is much simpler than its optical counterpart. Taking into account of the importance of THz technology applying in biological and medical field, the authors' device may provide a valuable method for bio-sensing and analysis.
作者对采用角度调制的太赫兹（THz）频率表面等离子体共振传感器（SPRS）进行了分析，并对光学SPRS和太赫兹SPRS进行了简要比较。在光学频率下，由于入射光波携带的能量共振转移到表面等离子体，角度反射光谱中会出现一个凹陷，而在太赫兹频率下会出现一个增强的反射峰。该峰的位置仅由棱镜和样品的折射率决定，与金属膜的性质无关。我们的结果表明，在太赫兹SPRS中测定样品的介电常数比在光学SPRS中要简单得多。考虑到太赫兹技术在生物和医学领域应用的重要性，作者的装置可能为生物传感和分析提供一种有价值的方法。
