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http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/5500| Title: | Ultrafast Dynamics of Gold Nanorods: Tuning Between Photo-Bleaching and Photo-Induced Absorption |
| Authors: | Anija, M. Kumar, Sunil Kamaraju, N. TIWARI, NEHA KULKARNI, S. K. Sood, S.K. Dept. of Physics |
| Keywords: | Nanorods Femtosecond pump–probe spectroscopy Surface plasmon 2011 |
| Issue Date: | Aug-2011 |
| Publisher: | World Scientific Publishing |
| Citation: | International Journal of Nanoscience, 10(4-5) |
| Abstract: | We report ultrafast electron dynamics in gold nanorods investigated using 80 fs laser pulses centered at 1.57 eV. Five types of nanorod colloidal suspensions in water having their longitudinal surface plasmon peak (ELSP) on either side of the laser photon energy (EL) have been studied. For ELSP > EL, photo-induced absorption with single decay time constant is observed. On the other hand, for ELSP < EL, photo-bleaching is observed having bi-exponential decay dynamics; the faster one between 1–3 ps and slower one between 7 ps to 22 ps both of them increasing almost linearly with the difference |EL – ELSP|. These time constants increase linearly with the pump intensity. Simulations have been carried out to understand the interplay between photo-bleaching and photo-induced absorption. |
| URI: | http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/5500 https://doi.org/10.1142/S0219581X11009179 |
| ISSN: | 0219-581X 1793-5350 |
| Appears in Collections: | JOURNAL ARTICLES |
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