Ultrafast Spectroscopy of Graphene-Protected Thin Copper Films

Eva A A Pogna; Stefano Dal Conte; Giancarlo Soavi; Vasyl G. Kravets; Yong Jin Kim; Stefano Longhi; Alexander N. Grigorenko; Giulio Cerullo; Giuseppe Della Valle

doi:10.1021/acsphotonics.6b00100

Ultrafast Spectroscopy of Graphene-Protected Thin Copper Films

Eva A A Pogna, Stefano Dal Conte, Giancarlo Soavi, Vasyl G. Kravets, Yong Jin Kim, Stefano Longhi, Alexander N. Grigorenko, Giulio Cerullo, Giuseppe Della Valle^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Pages (from-to)	1508-1516
Number of pages	9
Journal	ACS Photonics
Volume	3
Issue number	8
DOIs	https://doi.org/10.1021/acsphotonics.6b00100
Publication status	Published - 23 May 2016

Keywords

graphene
hot electrons
metal optics
nonlinear optics
ultrafast spectroscopy

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10.1021/acsphotonics.6b00100

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abstract = "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.",

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T1 - Ultrafast Spectroscopy of Graphene-Protected Thin Copper Films

AU - Pogna, Eva A A

AU - Dal Conte, Stefano

AU - Soavi, Giancarlo

AU - Kravets, Vasyl G.

AU - Kim, Yong Jin

AU - Longhi, Stefano

AU - Grigorenko, Alexander N.

AU - Cerullo, Giulio

AU - Della Valle, Giuseppe

PY - 2016/5/23

Y1 - 2016/5/23

N2 - 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.

AB - 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.

KW - graphene

KW - hot electrons

KW - metal optics

KW - nonlinear optics

KW - ultrafast spectroscopy

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Ultrafast Spectroscopy of Graphene-Protected Thin Copper Films

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