Stable optical trapping and sensitive characterization of nanostructures using standing-wave Raman tweezers.

ABSTRACT: Optical manipulation and label-free characterization of nanoscale structures open up new possibilities for assembly and control of nanodevices and biomolecules. Optical tweezers integrated with Raman spectroscopy allows analyzing a single trapped particle, but is generally less effective for individual nanoparticles. The main challenge is the weak gradient force on nanoparticles that is insufficient to overcome the destabilizing effect of scattering force and Brownian motion. Here, we present standing-wave Raman tweezers for stable trapping and sensitive characterization of single isolated nanostructures with a low laser power by combining a standing-wave optical trap with confocal Raman spectroscopy. This scheme has stronger intensity gradients and balanced scattering forces, and thus can

SUBMITTER: Wu MY 

PROVIDER: S-EPMC5314326 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature