Abstract

Coherent anti-Stokes Raman scattering spectroscopy as a nonlinear spectroscopy and plasmonic tip-enhanced near field microscopy as a super-resolving microscopy have been successfully combined to image and analyze molecular distribution of nano-structures [1]. Molecular distribution of DNA networks and carbon nanotubes with different types have been imaged with the resolution of 15 nm, and their vibration modes have been spectroscopically analyzed [1]. The near field effects occurring at the probe tip have been investigated, including electromagnetic field enhancement due to the plasmonic resonance of the metallic probe tip, chemical effect as charge transfer in a metal-molecule complex, and mechanical force effect resulting in the decrease of bond distance due to the AFM tip force [2,3].

© 2005 Optical Society of America