Optical Propulsion of Gold Nanoparticles Based on Na+-K+ Ion Exchanged Waveguide

• Main Authors: Chien chung-hsin, 簡仲信
• Other Authors: Tai Chao-yi
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/92799376487785473021

碩士 === 國立中央大學 === 光電科學與工程學系 === 104 === In this study, the propulsion of colloidal gold nanoparticles based on Na+-K+ ion exchange waveguides via the evanescent field was analyzed. Theoretically, the approach to calculate the optical forces exerted on nanoparticles was reviewed. Of particularly interest, we point out the importance where the chemistry of the nanoscale environment should be specially tailored in order to achieve trapping and transport of nanoparticles with high stability. Experimentally, we demonstrate the propulsion of silica micrometer-sized spheres along the optical waveguide over a length of 140μm. On the contrary, although the movement of gold nanoparticles against brownian motion was obvious, stable trapping and transport was not successful. We attribute the result to relatively weak gradient forces which can be further improved utilizing surface plasmon polariton waveguides.