Ultrafast Spectroscopy of Graphene-Protected Thin Copper Films
Dal Conte, S
Della Valle, G
MetadataShow full item record
Pogna, E., Dal Conte, S., Soavi, G., Kravets, V., Kim, Y., Longhi, S., Grigorenko, A., et al. (2016). Ultrafast Spectroscopy of Graphene-Protected Thin Copper Films. ACS Photonics, 3 (8), 1508-1516. https://doi.org/10.1021/acsphotonics.6b00100
© 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.
External DOI: https://doi.org/10.1021/acsphotonics.6b00100
This record's URL: https://www.repository.cam.ac.uk/handle/1810/275375