CUED Publications database

Ultrafast Spectroscopy of Graphene-Protected Thin Copper Films

Pogna, EAA and Dal Conte, S and Soavi, G and Kravets, VG and Kim, YJ and Longhi, S and Grigorenko, AN and Cerullo, G and Della Valle, G (2016) Ultrafast Spectroscopy of Graphene-Protected Thin Copper Films. ACS Photonics, 3. pp. 1508-1516.

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© 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.

Item Type: Article
Divisions: Div B > Electronics, Power & Energy Conversion
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:31
Last Modified: 07 Jun 2018 02:00