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Infrared study of Graphene: rich spectrumallows access to key observablesIR optical conductivity:2E f ±ΓYields info about:Im(σ)Re(σ)DrudeConductivityUniversalConductivityCarrier DensityDefectsSubstrate Effectsetc…E f = 650cm -1 , Γ = 30cm -1N. M. R. Peres et. al, EPL, (2008)Z.Q. Li et. al., Nature Phys, (2008)6/27/13 <strong>Bruker</strong> Nano Surfaces20
sSNOM IR study of Graphene: same richspectrum PLUS plasmonicsNear fieldspectrum2E f ±ΓFar fieldSpectrumPlasmonicsUniversalConductivityNear field spectrum yields same info as far field: Fermi energy, scattering rateBUT also shows a plasmonic resonance – not present in far field6/27/13 <strong>Bruker</strong> Nano Surfaces21
Page 1: Beating the Diffraction limit by 10
Page 4 and 5: Why Infrared sSNOM at the Nanoscale
Page 6 and 7: Just how big is a 1000X improvement
Page 8 and 9: Resolution limit in near field opti
Page 10 and 11: Optical contrast in sSNOM for 3D an
Page 12 and 13: How the near field light (E nf ) is
Page 14 and 15: sSNOM results from customers:implem
Page 16 and 17: University of Toronto - Prof. Walke
Page 18 and 19: IntroductionGraphene Discovery, wit
Page 22 and 23: Let’s probe Graphene’s universa
Page 24 and 25: Colocalized SPM investigation ofGra
Page 26 and 27: sSNOM in universal conductivity reg
Page 28 and 29: Now let’s switch to the plasmonic
Page 30 and 31: sSNOM of Graphene: fast imaging ofp
Page 32: Conclusion• Near field imaging wi

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