Journal
LASER PHYSICS LETTERS
Volume 11, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1612-2011/11/7/075902
Keywords
femtosecond laser pulse; gold nanorods; photoluminescence; two-temperature model; hot electrons
Categories
Funding
- Ministry of Education and Science of the Russian Federation [11.G34.31.0070]
- US National Science Foundation [CBET-0922876]
- Directorate For Engineering
- Emerging Frontiers & Multidisciplinary Activities [1240410] Funding Source: National Science Foundation
Ask authors/readers for more resources
We report observing anti-Stokes broadband radiation induced in gold nanorods by ultrashort laser pulses. The radiation is in the visible spectral range along with the second harmonic peak. Unlike conventional photoluminescence of metal nanoparticles, the energy of the excitation photons is smaller than the gap between the top of the d band and the Fermi level. Because the gold nanorods are irradiated with a pulse whose time is shorter than the electron-phonon equilibration time in gold, the energy is absorbed by s/p band electrons, creating a temperature difference between the electrons and the lattice, as described by the two-temperature model. Therefore, we identify the origin of the observed radiation as the recombination of hot conduction electrons with the d band holes created by the same ultrashort laser pulse.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available