Disentangling electrons and lattice nonlinear optical response in metal-dielectric Bragg filters

被引：15
|
作者：
Dal Conte, S. [1 ,2 ]
Conforti, M. [3 ,4 ]
Petti, D. [5 ,6 ]
Albisetti, E. [5 ,6 ]
Longhi, S. [1 ,2 ]
Bertacco, R. [5 ,6 ]
De Angelis, C. [3 ]
Cerullo, G. [1 ,2 ]
Della Valle, G. [1 ,2 ]
机构：
[1] CNR, Ist Foton & Nanotecnol, I-20133 Milan, Italy
[2] Politecn Milan, Dipartimento Fis, I-20133 Milan, Italy
[3] Univ Brescia, Dipartimento Ingn Informaz, CNISM, I-25123 Brescia, Italy
[4] Univ Lille 1, CNRS, UMR 8523, PhLAM,IRCICA,USR 3380, F-59655 Villeneuve Dascq, France
[5] Politecn Milano Polo Como, Dipartimento Fis, L NESS, I-22100 Como, Italy
[6] Politecn Milano Polo Como, Dipartimento Fis, CNISM, I-22100 Como, Italy
来源：
PHYSICAL REVIEW B | 2014年 / 89卷 / 12期
关键词：
INTERBAND ABSORPTION-EDGE; AU; PLASMONICS; PARTICLES; GOLD; AG;
D O I：
10.1103/PhysRevB.89.125122
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We investigate by broadband femtosecond pump-probe spectroscopy the transient optical response of a metaldielectric Bragg filter (MDBF) made of thin layers of gold and fused silica. A quantitative comparison of the experimental results with a semiclassical model with no fitting parameters allows us to disentangle all the different contributions to the transient optical response of the MDBF, which include the ultrafast dynamics of thermalized and nonthermalized electrons as well as of lattice phonons excited in the metal layers. Furthermore, we provide a quantitative comparison of the optical response of the MDBF with that of a single gold layer under comparable excitation conditions. The results clearly show the advantages and disadvantages of the multilayer configuration in terms of all-optical-modulation capability.
引用
收藏
页数：12
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