Dependence of the two-photon photoluminescence yield of gold nanostructures on the laser pulse duration

被引：87

作者：

Biagioni, P. ^{[1
]}

Celebrano, M. ^{[2
]}

Savoini, M. ^{[1
]}

Grancini, G. ^{[2
]}

Brida, D. ^{[2
]}

Matefi-Tempfli, S. ^{[3
]}

Matefi-Tempfli, M. ^{[3
]}

Duo, L. ^{[1
]}

Hecht, B. ^{[4
]}

Cerullo, G. ^{[2
]}

Finazzi, M. ^{[1
]}

机构：

[1] Politecn Milan, LNESS, Dipartimento Fis, I-20133 Milan, Italy

[2] Politecn Milan, CNR, INFM, Dipartimento Fis,ULTRAS, I-20133 Milan, Italy

[3] Univ Catholique Louvain, Unite Physicochim & Phys Mat, B-1348 Louvain, Belgium

[4] Univ Wurzburg, Inst Phys, Wilhelm Conrad Rontgen Ctr Complex Mat Syst RCCM, Nanoopt & Biophoton Grp,Dept Expt Phys 5, D-97074 Wurzburg, Germany

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 04期

关键词：

MULTIPHOTON LUMINESCENCE; IN-VITRO; NANOPARTICLES; NANORODS; NANOWIRES; ELECTRON; MODES;

D O I：

10.1103/PhysRevB.80.045411

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Two-photon photoluminescence (TPPL) from gold nanostructures is becoming one of the most relevant tools for plasmon-assisted biological imaging and photothermal therapy as well as for the investigation of plasmonic devices. Here we study the yield of TPPL as a function of the temporal width delta of the excitation laser pulses for a fixed average power. In the delta > 1 ps regime, the TPPL yield decreases as delta is increased, while for shorter pulse widths it becomes independent of delta and, consequently, of the laser-pulse peak power. This peculiar dynamics is understood and modeled by considering that two-photon absorption in Au is a two-step process governed by the lifetime of the metastable state populated by the first photon absorption.

引用

页数：5

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