Low-cost,high performance surface plasmon resonance-compatible films characterized by the surface plasmon resonance technique |
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| Authors: | Li Song-Quan Ye Hong-An Liu Chun-Yu Dou Yin-Feng Huang Yan |
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| Affiliation: | School of Electronic Engineering, Heilongjiang University, Harbin 150080, China |
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| Abstract: | A new analytical method based on the surface plasmon resonance (SPR) technique is presented, with which SPR curves for both wavelength and angular modulations can be obtained simultaneously via only a single scan of the incident angle. Using this method, the SPR responses of TiO2-coated Cu films are characterized in the wavelength range from 600 nm to 900 nm. For the first time, we determine the effective optical constants and the thicknesses of TiO2-coated Cu films using the SPR curves of wavelength modulation. The sensitivities of prism-based SPR refractive index sensors using TiO2-coated Cu films are investigated theoretically for both wavelength and angular modulations, the results show that in the case of sensitivity with wavelength modulation, TiO2-coated Cu films are not as good as the Au film, however, they are more suitable than the Au film for SPR refractive index sensors with angular modulation because a higher sensitivity can be achieved. |
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| Keywords: | surface plasmon resonance optical constants thin film |
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