Ultrafast electron dynamics in gold nanoshells

被引:97
作者
Averitt, RD [1 ]
Westcott, SL
Halas, NJ
机构
[1] Rice Univ, Dept Elect & Comp Engn, Houston, TX 77005 USA
[2] Rice Univ, Ctr Nanoscale Sci & Technol, Houston, TX 77005 USA
关键词
D O I
10.1103/PhysRevB.58.R10203
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We present ultrafast optical studies on nanoshells, which consist of a nanoscale Au2S dielectric core surrounded by an ultrathin Au shell. The plasmon frequency of these nanoparticles can be controlled by varying the ratio of the core diameter to shell thickness. By tuning this plasmon peak, we have observed both transient bleaching and transient absorption for Au nanoshells embedded in polyvinyl alcohol. We relate the induced change in transmission of gold nanoshell films to the electron dynamics in the thin gold shell. Our results indicate that even when the plasmon frequency is shifted below the onset of interband transitions, interband effects are still of primary importance in determining the nonlinear optical response. An electron relaxation time of 1.65+/-0.10 ps is measured that corresponds to an electron-phonon coupling constant of 2.2 x 10(16) W/(m(3) K), smaller than that observed in bulk Au films. [S0163-1829(98)50740-0].
引用
收藏
页码:10203 / 10206
页数:4
相关论文
共 27 条
[1]  
ANISIMOV SI, 1974, ZH EKSP TEOR FIZ+, V66, P776
[2]   Plasmon resonance shifts of Au-coated Au2S nanoshells: Insight into multicomponent nanoparticle growth [J].
Averitt, RD ;
Sarkar, D ;
Halas, NJ .
PHYSICAL REVIEW LETTERS, 1997, 78 (22) :4217-4220
[3]  
AVERITT RD, 1998, THESIS RICE U
[4]  
BELOTSKII ED, 1992, ZH EKSP TEOR FIZ+, V101, P163
[5]   ELECTRON DYNAMICS IN COPPER METALLIC NANOPARTICLES PROBED WITH FEMTOSECOND OPTICAL PULSES [J].
BIGOT, JY ;
MERLE, JC ;
CREGUT, O ;
DAUNOIS, A .
PHYSICAL REVIEW LETTERS, 1995, 75 (25) :4702-4705
[6]  
BIGOT JY, 1998, B AM PHYS SOC, V43, P194
[7]   Reversible tuning of silver quantum dot monolayers through the metal-insulator transition [J].
Collier, CP ;
Saykally, RJ ;
Shiang, JJ ;
Henrichs, SE ;
Heath, JR .
SCIENCE, 1997, 277 (5334) :1978-1981
[8]  
COLVIN VL, 1994, NATURE, V370, P354, DOI 10.1038/370354a0
[9]   OBSERVATION OF NON-EQUILIBRIUM ELECTRON HEATING IN COPPER [J].
EESLEY, GL .
PHYSICAL REVIEW LETTERS, 1983, 51 (23) :2140-2143
[10]   DIRECT MEASUREMENT OF NONEQUILIBRIUM ELECTRON-ENERGY DISTRIBUTIONS IN SUBPICOSECOND LASER-HEATED GOLD-FILMS [J].
FANN, WS ;
STORZ, R ;
TOM, HWK ;
BOKOR, J .
PHYSICAL REVIEW LETTERS, 1992, 68 (18) :2834-2837