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Nonlinear graphene metamaterial
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) The electronic band structure of graphene can be approximated by two cones intersecting at the Dirac point. The pump beam creates a short-lived carrier distribution (b) that blocks the interband transitions induced a few ps later by the probe beam (c), hence leading to an absorption decrease. (d) and (e) Helium ion microscope images of a metamaterial array partially covered with graphene.

Image of FIG. 2.
FIG. 2.

Transient relative transmission change as a function of pump-probe time delay for the graphene metamaterial (red dotted line) and graphene on Si3N4 (blue doted line) at a pump fluence of J/cm2 and wavelength of 1600 nm. In the case of graphene on Si3N4, the signal reaches noise levels after 3 ps and hence, subsequent recorded values have been discarded. The black dashed lines represent fits of exponentially decaying functions with characteristic time constants ps and ps, for the graphene metamaterial and graphene on Si3N4, respectively.

Image of FIG. 3.
FIG. 3.

(a) Spectral dependence of the nonlinear transmission changes for the graphene metamaterial (red squares) and graphene on Si3N4 (black circles). The red and black lines serve as eye-guides. For comparison, the linear absorption of the graphene metamaterial is also presented (dashed blue line). In the inset, the wavelength dependence of the relaxation time is shown for graphene on Si3N4 (black circles) and the graphene metamaterial (red squares).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Nonlinear graphene metamaterial