| Summary: | 碩士 === 長庚大學 === 光電工程研究所 === 102 === he enhancement of sensitivity and precision of surface plasmon resonance (SPR) sensors by metal/dielectric/metal (MDM) structures was investigated in this work. Based on numerical simulation, both the MDM SPR sensors with appropriate parameters and the traditional SPR sensors were fabricated. The full width at half maximum of the MDM SPR sensor under angular interrogation was found to be narrower than that of traditional SPR sensor both in numerical simulation and in practice.
In addition, a novel MDM SPR sensor featured with the function of self-correction was developed. The principle of this device was based on the facts that an odd-symmetric surface plasmon wave (SPWodd) and an even-symmetric SPW (SPWeven) can be sustained by the MDM structure and another SPW (SPWAu/solution) can be sustained by the bottom metal/analyst interface. As the bottom metal is thin enough, SPWodd and SPWAu/solution can couple with each other and then split into two SPW modes, SPWodd-like and SPWAu/solution-like with the intended characteristics.
The resonance angle of SPWAu/solution-like can be pushed to approach the critical angle by this coupling effect and the sensitivity associated with this resonance is therefore improved. Besides, the SPWodd-like is barely affected by the refractive index variation of the solution. This fact indicates that the SPWodd-like signal can be adopted as a reference for canceling the common mode noises during the measurement. Details of the realization are included in this thesis.
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