Ultrafast dynamics of colloidal silver nanoparticles in an aqueous solution was investigated by observing the ultrafast lensing effects caused by a photo-induced refractive index change. The ultrafast response consisted of an instantaneous peak by the optical Kerr effect and a subsequent bi-exponential decay component. The decay component was independent of the relative polarization planes of pump and probe beams and had temperature-dependent time constants ranging from 0.4 to 2.2 ps and from 10 to 100 ps. A minimum at around 7°C was found for the time constant of the fast component. The results suggest that the structure of water molecules adjacent to the silver surface is affected by hydrogen bonds in a temperature-dependent manner similar to that of the molecular structure of bulk water.
|Number of pages||4|
|Journal||Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers|
|Issue number||5 B|
|Publication status||Published - 2000|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)