Issue
EPL
Volume 84, Number 6, December 2008
Article Number 67005
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/84/67005
Published online 12 January 2009
EPL, 84 (2008) 67005
DOI: 10.1209/0295-5075/84/67005

Optically induced angular motion of single-molecules

G. 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

Abstract
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.

PACS
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