Picosecond Self-Induced Thermal Lensing from Colloidal Silver Nanodisks
Title | Picosecond Self-Induced Thermal Lensing from Colloidal Silver Nanodisks |
Publication Type | Journal Article |
Year of Publication | 2004 |
Authors | Maillard, M, Pileni, M-P, Link, S, EL-Sayed, MA |
Journal | The Journal of Physical Chemistry B |
Volume | 108 |
Issue | 17 |
Pagination | 5230 - 5234 |
Date Published | 2004 |
ISBN Number | 1520-6106 |
Abstract | The optical and nonradiative relaxation dynamics of 5 nm 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 rather 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.The optical and nonradiative relaxation dynamics of 5 nm 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 rather 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. |
URL | http://dx.doi.org/10.1021/jp049943z |
DOI | 10.1021/jp049943z |
Short Title | J. Phys. Chem. B |