Dynamics, Efficiency, and Energy Distribution of Nonlinear Plasmon-Assisted Generation of Hot Carriers
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- 作者：Olivier Demichel ; Marlène Petit ; Sviatlana Viarbitskaya ; Régis Méjard ; Frédérique de Fornel ; Edouard Hertz ; Franck Billard ; Alexandre Bouhelier ; Benoit Cluzel
- 刊名：ACS Photonics
- 出版年：2016
- 出版时间：May 18, 2016
- 年：2016
- 卷：3
- 期：5
- 页码：791-795
- 全文大小：523K
- 年卷期：0
- ISSN：2330-4022
文摘
We employ nonlinear autocorrelation measurements to investigate plasmon-assisted hot carrier dynamics occurring in optical gold antennas. A nonlinear formation of hot carriers is produced by the excitation of surface plasmons, providing thus a unique lever to optimize the energy distribution and generation efficiency of the photoexcited charges. The temporal response of the carriers’ relaxation is controlled within a range extending from 500 fs to 2.5 ps. By conducting a quantitative analysis of the dynamics, we determine the nonlinear absorption cross-section of individual optical antennas. This work sheds new insights on the understanding of plasmon-induced hot carrier generation, especially in view of applications where the time response plays a preponderant role.