| Summary: | 碩士 === 國立臺灣海洋大學 === 系統工程暨造船學系 === 98 === Inducing a large electric field enhancement for weak signals is very important in surface-enhanced Raman scattering (SERS). In this thesis, a good metal nano-structure substrate for SERS system to enhancement raman scattering has been designed.
The localized surface plasmon(LSP) resonance properties of metal annular structure is good at substrate for SERS experiment. In this thesis, the distribution of electric field and total intensity has been simulated by FDTD (finite-difference time-domain). Four kinds of gold nano-structure are simulated. They are cylinder, hole, annular aperture and overlapping of two annular apertures with an incident light of plane wave. The parameters such as the thickness of the gold film are the diameter of cylinder and hole, the inner and outer diameter of the annular aperture, the overlapping distance of two annular apertures, and at last the vertical and lateral distance of two overlapping annular apertures. The physics properties have been studied.
Furthermore, the best parameters of the best intensity were combined. The coupled effects of plasmon appear obviously on the tip of the structure when two annular structures overlap. A 2x2 array of two annular apertures nano-structure which has a large enhancement of 65.32 times has been designed.
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