Abstract
The effect of thermal-induced Brownian motion on gold nanoparticles (Au NPs) in optical traps is studied by fluorescence correlation spectroscopy (FCS) method. The Brownian motion and optical trapping potential are investigated by the decay time of the FCS curve and the laser power. It is shown that that the probability of finding a gold nanoparticle in the trap depends on the ratio of the optical energy of the particle to its thermal energy. A power threshold is observed by the decay time as a function of laser power. The experimental studies show that the temperature rise does not seriously affect the average number of particles in the focal spot, but the average residence time is more sensitively affected by the temperature.
| Original language | English |
|---|---|
| Journal | Laser Physics |
| Volume | 21 |
| Issue number | 1 |
| Pages (from-to) | 130-136 |
| Number of pages | 7 |
| ISSN | 1054-660X |
| DOIs | |
| Publication status | Published - 01.01.2011 |
Funding
This study was supported by the National Nature Science Foundation of China NSFC 60878056 and NSFC 60927011, and grant from the Ph. D. Programs Foundation of Ministry of Education of China no. 200806980024; Project Based Personel Exchange Programme with CSC and DAAD and the Interna tional Cooperation Key Project of Shaanxi Province 2009KW 15. We acknowledge Norbert Koop, Ramtin Rahmanzadeh, Barbara Flucke and Astrid Rodewald at institute of biomedical optics for their help during these experiments.
