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The nonlinear absorption of gold nanorods (GNRs) was investigated by nanosecond Z scan technique at 532nm. It was found that the GNRs exhibit satura ble absorption (SA) characteristics. The SA was ascribed to the bleaching of ground state plasmon. Besides, the ultrafast dynamics process of the GNRs was investigated by femtosecond pump probe technology. It was found that the dynamics process includes a fast decay and a slow decay with time constant of 3ps and 105 ps, respectively. Theoreti cal results show that the fast decay process is due to the coupling of electron phonon, and the slow decay process is due to the coupling of phonon phonon..
Saturable absorption, Dynamics process, GNRs, Z-scan, Pump-probe.
SHUANG CHEN, SUYING YANG, WENZHI WU, YACHEN GAO, Nonlinear absorption and ultrafast dynamics process of gold nanorods, Optoelectronics and Advanced Materials - Rapid Communications, 13, 9-10, September-October 2019, pp.525-529 (2019).
Submitted at: March 11, 2019
Accepted at: Oct. 9, 2019