Spectra Enhance Plasmon Photonics-based Surface

The localized electromagnetic field enhancement resulted from the surface plasmon can enhance the optical signals of molecule in the vicinity of metallic substrate surface. Optical signals can be controlled at nanoscale by changing the size, shape and dielectric environment of metallic nanostructure. A powerful technique based on the surface plasmon, surface enhanced spectroscopy has been widely used in biological and chemical sensor, new light source, high efficiency optical sensor, and nano-optical imaging, etc. In this dissertation, properties of suface enhanced spectroscopy and tip enhanced Raman scattering are studied, and some novel physical phenomena has been observed.The dissertation is divided mainly into two parts. First, the surface enhanced fluorescence on nanohole array and three-dimensional nanoparticles is investigated by using electrochemical and micro-nano technology. We also use chemical method to synthesize gold nanoparticle dimers and trimers, and study the enhanced fluorescence and Raman scattering effect in liquid medium theoretically and numerically. Second, both experimental and theoretical studies on the tip enhanced Raman scattering in high vacuum (HV-TERS) are presented. Ultrasensitive Stokes and anti-Stokes Raman signals and local temperature are obtained through HV-TERS. Some interesting phenomena on the plasmon-driven chemical reaction and nonlinear effects in HV-TERS are observed too.