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(Color online) Map of tanΨ at 2992 cm−1 showing the two graphite flakes and the spot size (80/20 knife edge) and locations of the scans A and B. The inset shows a digital photograph of the graphite flakes (middle and bottom) and the graphene flake (white outline) which is visible by eye. Scale bar approximately 200 μm.
(Color online) Real (top) and imaginary (bottom) parts of the dielectric functions of the graphene (thick solid black lines) and graphite (thin solid red lines) flakes measured at positions A and B, respectively. Also shown are the measured curves for gold (green line). The inset shows a zoomed region comparing the thin graphite and bulk HOPG (dashed blue line) curves. The boxed area denotes a region of values that are influenced by a substrate phonon feature.
(Color online) Real part of the optical conductivity σ for the graphene (smoothed) and the graphite flakes (thick black and thin red lines, respectively). The graphene data is fit with a Drude-Lorentz model (thick dashed blue line), which are decomposed into the individual Drude and Lorentz components (thin dashed blue lines).
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