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

Stefano Dal Conte | Zendy; Matteo Conforti | Zendy; D. Petti | Zendy; Edoardo Albisetti | Zendy; Stefano Longhi | Zendy; R. Bertacco | Zendy; Costantino De Angelis | Zendy; Giulio Cerullo | Zendy; Giuseppe Della Valle | Zendy

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

Author(s) -

Stefano Dal Conte,

Matteo Conforti,

D. Petti,

Edoardo Albisetti,

Stefano Longhi,

R. Bertacco,

Costantino De Angelis,

Giulio Cerullo,

Giuseppe Della Valle

Publication year - 2014

Publication title -

physical review b

Language(s) - English

Resource type - Journals

eISSN - 1538-4489

pISSN - 1098-0121

DOI - 10.1103/physrevb.89.125122

Subject(s) - femtosecond , materials science , excited state , excitation , ultrashort pulse , dielectric , electron , transient response , free electron model , lattice (music) , laser , optics , optoelectronics , atomic physics , physics , electrical engineering , quantum mechanics , engineering , acoustics

We investigate by broadband femtosecond pump-probe spectroscopy the transient optical response of a metaldielectricBragg filter (MDBF) made of thin layers of gold and fused silica. A quantitative comparison of theexperimental resultswith a semiclassical modelwith no fitting parameters allows us to disentangle all the differentcontributions to the transient optical response of the MDBF, which include the ultrafast dynamics of thermalizedand nonthermalized electrons as well as of lattice phonons excited in the metal layers. Furthermore, we providea quantitative comparison of the optical response of the MDBF with that of a single gold layer under comparableexcitation conditions. The results clearly show the advantages and disadvantages of the multilayer configurationin terms of all-optical-modulation capability

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