Electron heating and thermal relaxation of gold nanorods revealed by two-dimensional electronic spectroscopy

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Title
Electron heating and thermal relaxation of gold nanorods revealed by two-dimensional electronic spectroscopy
Author(s)
Aude Lietard; Cho-Shuen Hsieh; Hanju Rhee; Minhaeng Cho
Publication Date
2018-03
Journal
NATURE COMMUNICATIONS, v.9, no.291, pp.1 - 10
Publisher
NATURE PUBLISHING GROUP
Abstract
To elucidate the complex interplay between the size and shape of gold nanorods and their electronic, photothermal, and optical properties for molecular imaging, photothermal therapy, and optoelectronic devices, it is a prerequisite to characterize ultrafast electron dynamics in gold nanorods. Time-resolved transient absorption (TA) studies of plasmonic electrons in various nanostructures have revealed the time scales for electron heating, lattice vibrational excitation, and phonon relaxation processes in condensed phases. However, because linear spectroscopic and time-resolved TA signals are vulnerable to inhomogeneous line-broadening, pure dephasing and direct electron heating effects are difficult to observe. Here we show that femtosecond two-dimensional electronic spectroscopy, with its unprecedented time resolution and phase sensitivity, can be used to collect direct experimental evidence for ultrafast electron heating, anomalously strong coherent and transient electronic plasmonic responses, and homogenous dephasing processes resulting from electron-vibration couplings even for polydisperse gold nanorods.
URI
https://pr.ibs.re.kr/handle/8788114/4625
ISSN
2041-1723
Appears in Collections:
Center for Molecular Spectroscopy and Dynamics(분자 분광학 및 동력학 연구단) > Journal Papers (저널논문)
Files in This Item:
Electron heating and thermal relaxation of gold_Aude(조민행) Nature comm.pdfDownload

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