Picosecond self-induced thermal lensing from colloidal silver nanodisks

TitlePicosecond self-induced thermal lensing from colloidal silver nanodisks
Publication TypeJournal Article
Year of Publication2004
AuthorsMaillard, M, Pileni, M-P, Link, S, EL-Sayed, MA
JournalJournal of Physical Chemistry B
Date PublishedApr
ISBN Number1520-6106
Accession NumberWOS:000220997300018

The optical and nonradiative relaxation dynamics of 5 unit thick silver nanodisks with a 25 nm diameter have been investigated in an organic solvent by continuous wave (cw) and femtosecond pump-probe time-resolved spectroscopies. Several surface plasmon absorption bands are observed due to the disk shape of these particles. In the time-resolved experiments, the time dependence of the bleach resulting from femtosecond pulsed excitation is studied. On the 1-3 ps time scale, a decay resulting from electron-phonon relaxation is observed. On a longer time scale (>20 ps), a rise father than a further decay of the bleach intensity is observed. This is shown to result from the formation of a thermal lens due to the induced thermal gradients produced from heating the organic solvent by the phonon-phonon relaxation processes of the photoexcited nanodisks.