Optically induced angular motion of single-moleculesG. Dutier1, V. de Beaucoudrey1, A. C. Mitus2 and S. Brasselet1
1 Laboratoire de Photonique Quantique et Moléculaire, Ecole Normale Supérieure de Cachan 61 avenue du Président Wilson, 94235 Cachan Cedex, France, EU
2 Institute of Physics, Wroclaw University of Technology - Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland, EU
received 11 August 2008; accepted in final form 14 November 2008; published December 2008
published online 12 January 2009
Optically induced angular motion of individual molecules exhibiting both fluorescence and photo-isomerization properties is investigated in polymer films, by means of a polarized resonant optical pump and probe scheme. The single-molecule dynamics is analyzed using a kinetic model accounting for both photo-isomerization and thermal diffusion phenomena. This study shows that the process is strongly diffusion driven and reveals the relevant time scales that can lead to a pure light-induced molecular-rotation control.
78.67.-n - Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures.
33.80.-b - Photon interactions with molecules.
78.40.Me - Organic compounds and polymers.
© EPLA 2008