Abstract
There are three parts in this thesis, including optical constants of gold nanoparticles, the enhanced sensitivity of surface plasmons resonance biosensor by nanoparticles, nanoimprint techniques for patterning metallic structures and their applications. The purpose of studying the optical constants of gold nanoparticles is to find out the reason of optical constants changes as the bulk gold films transferring to nanoparticles. We measured the ellipsometric parameters of gold nanoparticles with different particle-size, particle-density, and reduction methods by using varing angle spectroscopic ellipsoometer (VASE), and then fitted the optical constants of various gold nanoparticles. In the particles enhance the sensitivity of surface plasmons resonance biosensor, the sensitivity enhancement effects of different particle-size, particle-density and contact-area of gold nanoparticles were analyzed. For the nanoimprint techniques for patterning metallic structures, we successfully develop the technology of directly imprint the metal surface with low-pressure. The effects of various imprinting conditions were investigated. Optical devices such as polarizer and blazed grating were demonstrated. Combining with patterned metal structures and surface plasmonic devices, we can use the gratings with different period and amplitude to control the position of surface plasmonon resonance angle.