Improving surface plasmon detection in gold nanostructures using a multi-polarization spectral integration method.

• Main Authors: Min-Jian Chih, 池旻鍵
• Other Authors: Pei-Kuen Wei
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/38646453010741353510

碩士 === 國立臺灣海洋大學 === 機械與機電工程學系 === 100 === We presented a multi-polarization spectral integration method to increase the refractive index detection limit of gold nanostructures. This analysis method considers all resonances in transmission spectra for various polarized light. By integrating all the intensity changes over all the polarized resonances, the noise level is greatly decreased. For a nanoslit structure the signal-to-noise ratio is increased about 1.7 times larger than the simple spectral integration method. Further studies with dual-period nanogrid structures show that the signal-to-noise ratio and refractive index detection limit are increased to 8.16 times due to more resonances in different polarization states. The nanogrid structures achieve a detection limit of 2.26×10-6 refractive index unit when the intensity stability is 0.2%. The proposed method provides an efficient way for improving surface plasmon detection limits of polarization-dependent metallic nanostructures.