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Auxiliary Top‐Illumination in the Kretschmann–Raether Configuration: A Theoretical Study on the Surface Plasmon Resonance Response
Physica Status Solidi (B) - Basic Solid State Physics ( IF 1.5 ) Pub Date : 2020-07-04 , DOI: 10.1002/pssb.202000222 Cavus Falamaki 1 , Elahe Rastegar Pashaki 2
Physica Status Solidi (B) - Basic Solid State Physics ( IF 1.5 ) Pub Date : 2020-07-04 , DOI: 10.1002/pssb.202000222 Cavus Falamaki 1 , Elahe Rastegar Pashaki 2
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A new variation of surface plasmon resonance (SPR) sensors design with Kretschmann–Raether (KR)‐type configuration is presented. Using a rotational incident angle scanning platform, the conductor nanolayer is normally irradiated with an auxiliary unpolarized light beam from the dielectric side. Both illumination sources should have a coherence length much larger than their source/Au layer optical path. Beginning with a Lorentzian‐type oscillator model, a general dispersion equation for the metal nanolayer is developed that incorporates interband transitions and polychromaticity of the top‐illumination beam. SPR curves are then predicted based on the transfer‐matrix method. Simulation results show that the top‐illumination frequency and its relative amplitude with respect to the bottom laser beam may impart significant changes to the SPR curve. It is shown that the implementation of short‐wave ultraviolet light (180 nm) may considerably improve the performance of SPR sensors in terms of the figure‐of‐merit. Larger wavelengths generally lead to performance deterioration. Based on the transverse magnetic solutions of the wave equation, a theoretical interpretation of the results is presented that confirms the strong effect of top illumination on the magnitude of the decay lengths in the conductor/dielectric and the propagation constant.
中文翻译：
Kretschmann-Raether构造中的辅助顶部照明：表面等离振子共振响应的理论研究
提出了采用Kretschmann–Raether（KR）型配置的表面等离子体激元共振（SPR）传感器设计的新变体。使用旋转入射角扫描平台，通常从电介质侧向导体纳米层照射辅助非偏振光束。两个照明源的相干长度应远大于它们的源/ Au层光路。从洛伦兹型振荡器模型开始，开发了用于金属纳米层的通用色散方程，其中包含了带间过渡和顶部照明光束的多色性。然后根据传递矩阵法预测SPR曲线。仿真结果表明，顶部照明频率及其相对于底部激光束的相对幅度可能会使SPR曲线发生重大变化。结果表明，就品质因数而言，实施短波紫外线（180 nm）可能会大大改善SPR传感器的性能。较大的波长通常会导致性能下降。基于波动方程的横向磁解，对结果进行了理论解释，证实了顶部照明对导体/电介质中衰减长度的大小和传播常数的强烈影响。
更新日期：2020-09-10
中文翻译：
Kretschmann-Raether构造中的辅助顶部照明：表面等离振子共振响应的理论研究
提出了采用Kretschmann–Raether（KR）型配置的表面等离子体激元共振（SPR）传感器设计的新变体。使用旋转入射角扫描平台，通常从电介质侧向导体纳米层照射辅助非偏振光束。两个照明源的相干长度应远大于它们的源/ Au层光路。从洛伦兹型振荡器模型开始，开发了用于金属纳米层的通用色散方程，其中包含了带间过渡和顶部照明光束的多色性。然后根据传递矩阵法预测SPR曲线。仿真结果表明，顶部照明频率及其相对于底部激光束的相对幅度可能会使SPR曲线发生重大变化。结果表明，就品质因数而言，实施短波紫外线（180 nm）可能会大大改善SPR传感器的性能。较大的波长通常会导致性能下降。基于波动方程的横向磁解，对结果进行了理论解释，证实了顶部照明对导体/电介质中衰减长度的大小和传播常数的强烈影响。
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