| Summary: | 碩士 === 國立虎尾科技大學 === 光電工程系光電與材料科技碩士班 === 106 === This paper mainly studies the application of surface plasmon resonance (SPR) and guided mode resonance (GMR) elements. The grating structure is fabricated using nanoimprinting and coated with titanium dioxide (Tio2) or gold (Au) film.
We polarized the led flashlight as an experimental light source and incident on the SPR element. When turning the SPR angle and measuring with a spectrometer, it can be seen that the intensity of the reflected light at a specific wavelength is significantly decreased. If the refractive index of the medium on the SPR element is changed, the resonance wavelength will shift too. Then, the reflected light of the SPR element is incident on the guided mode resonance (GMR) element, and the angle of the guided mode resonant element is adjusted to resonate at our predicted wavelength. After changing the refractive index, if the SPR resonance wavelength coincides with the GMR resonance wavelength, it will decrease in the intensity measurement, so that the function of the concentration sensor can be achieved.
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