Wide-field Rayleigh scattering imaging and spectroscopy of gold nanoparticles in heavy water under laser trapping

Publication year: 2011
Source: Journal of Photochemistry and Photobiology A: Chemistry, In Press, Accepted Manuscript, Available online 13 June 2011

Takayuki, Uwada , Teruki, Sugiyama , Hiroshi, Masuhara

We demonstrated wide-field Rayleigh scattering spectroscopy and imaging of gold nanoparticle trapping upon a focused near-infrared laser irradiation under dark-field illumination. The migration, trapping, and assembling behavior of gold nanoparticles were examined at single nanoparticle level at the focus spot and its surrounding area in heavy water. It is clarified that particle migration to the laser spot within the focal plane is not appreciable while scattering force drives the migration vertically along the direction of light propagation. The gradient force at the focus point and the scattering force are theoretically estimated to be 3.1 and 0.17 pN, which are consistent…