Effect of tip geometry and crystallinity on two photon excited luminescence and laser scattering of single gold nanorods

This thesis investigates the intrinsic radiative features of gold nanorods using linear and nonlinear spectroscopy. Here, we report direct, independent measurements of two-photon action cross sections (TPACS) of single gold bipyramids, hemispherically capped cylindrical nanorods and dumbbells, which have increasing radius of curvature at the tip, are measured and compared per same aspect ratio and volume. We also performed nanometer precise investigation on surface plasmon resonance (SPR) mediated scattering and two photon properties properties of electron beam lithography (EBL) fabricated gold nanorods and locally estimated the damped plasmon phase shift due to the metallic adhesion layer induced plasmon damping.