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Ultrafast Spectroscopy of Graphene-Protected Thin Copper Films

Accepted version
Peer-reviewed

Type

Article

Change log

Authors

Pogna, EAA 
Dal Conte, S 
Kravets, VG 
Kim, YJ 

Abstract

© 2016 American Chemical Society. We studied by broad-band pump-probe spectroscopy the ultrafast optical response of thin copper films covered by a monolayer of graphene. It is demonstrated that graphene protection does not alter the thermo-modulational nonlinearity of copper in the whole visible range. Also, we provide a quantitative validation of a theoretical model for this optical nonlinearity, derived from a semiclassical description of electron thermalization dynamics and subsequent modulation of copper dielectric function from 450 to 700 nm wavelength. Our results extend to the nonlinear domain the capability of graphene-protected copper nanolayers to serve as a low cost optical grade material, with major potential impact on nonlinear plasmonics and metamaterials.

Description

Keywords

ultrafast spectroscopy, metal optics, graphene, nonlinear optics, hot electrons

Journal Title

ACS Photonics

Conference Name

Journal ISSN

2330-4022
2330-4022

Volume Title

3

Publisher

American Chemical Society (ACS)
Sponsorship
European Commission (604391)