| Summary: | 碩士 === 國立中央大學 === 光機電工程研究所 === 100 === A novel optical measurement technology “Sensitivity-tunable surface plasmon resonance sensor” is proposed. This system has advantage of high sensitivity and high resolution by employing heterodyne interferometry for SPR phase detection. Besides, the sensitivity is tunable according to difference of samples by adjusting the azimuthal angle of quarter wave plate. This technique is quite a potential sensing system with two-dimension.
In this study, the pure water and alcohol solutions are used to estimate sensitivities and resolutions. Increasing the azimuthal angle makes a better sensitivity while sample’s refractive index is higher. In additional, to tune the quarter wave plate can provide a larger dynamic range as the difference of refractive index larger.
According to the results, the best sensitivity of this system is 1.7×10^5 (°/RIU). The resolution is 5.3×10^-7 RIU with the stability of phase drift 0.09 degree. Meanwhile, the sensing area is 2mm×2mm.
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