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根据电磁场在金属薄膜中的能量分布规律和金属薄膜具有复介电常数的特点,对激励表面等离子共振的金属薄膜的最佳厚度进行了探讨.指出金属薄膜的最佳厚度与激励光波长和金属薄膜的折射率有关,建立了描述它们之间关系的数学表达式,并用实验方法进行验证.将理论结果与他人的测量结果进行对比后发现,两者符合较好.研究结果表明:在角度调制下的表面等离子共振传感器,为了获得更高的灵敏度,可根据激励光波长和金属薄膜折射率的虚部确定所要制备金属薄膜的最佳厚度;在波长调制下,则由中心波长和折射率的虚部确定金属薄膜的最适宜使用厚度.
According to the energy distribution law of electromagnetic field in metal thin film and the characteristic of complex dielectric constant of metal thin film, the optimal thickness of metal thin film excited by surface plasmon resonance is discussed.The optimum thickness of metal thin film is compared with the excitation light wavelength and metal The refractive index of the film, the mathematical expression describing the relationship between them is established and verified by experimental methods.Comparing the theoretical results with those of others, it is found that the two are in good agreement.The results show that in angle modulation Under the surface plasmon resonance sensor, in order to obtain higher sensitivity, according to the excitation light wavelength and the refractive index of the metal film to determine the optimal thickness of the metal film to be prepared the best thickness; in the wavelength modulation, the center wavelength and refractive index of The imaginary part determines the optimum thickness of the metal film.