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Thermal Radiation Scanning Tunneling Microscopy

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Yannick De Wilde, Florian Formanek, Remi Carminati, Boris Gralak, Paul-Arthur Lemoine, Karl Joulain, Jean-Philippe Mulet, Yong Chen, Jean-Jacques Greffet Nature , 444 , 740, 7 December 2006 Presented by: F. Hakan K ö kl ü. Thermal Radiation Scanning Tunneling Microscopy. Outline. - PowerPoint PPT Presentation
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  • Thermal Radiation Scanning Tunneling MicroscopyYannick De Wilde, Florian Formanek, Remi Carminati, Boris Gralak, Paul-Arthur Lemoine, Karl Joulain, Jean-Philippe Mulet, Yong Chen, Jean-Jacques Greffet

    Nature, 444, 740, 7 December 2006

    Presented by: F. Hakan Kkl

  • OutlineScanning tunnelling microscopy basicsThermal radiation scanning tunnelling microscopyAnalogy between TRSTM and STMImaging results artefact free imagingVerification of surface states through imagingOrigin of the signalConclusions

  • Scanning Tunnelling Microscopy (STM) Tunnelling current through vacuumConstant current modeImaging as a function of voltageElectronic local density of states (eLDOS)1 http://en.wikipedia.org/wiki/Scanning_tunneling_microscope2 J. Tersoff, D. R. Hamann, Phys. Rev. B., 31, 805 (1985)

  • Thermal Scanning Tunnelling Microscopy (TRSTM)Near field optical microscopy using thermal wavelengths no external illuminationIncludes an atomic force microscopy used in dynamic modeElectromagnetic local density of states (EM-LDOS) 3 K.Joulain, R. Carminati, J-P. Mulet, J-J. Greffet, Phys. Rev. B, 68, 245405 (2003)

  • Analogy between STM and TRSTMeLDOSFermi Dirac statisticsMeasurement at the Fermi energy levelElectronsEM-LDOSBose Einstein statisticsMeasurement at chosen wavelengthPhonon and plasmon enhanced photon scattering 4 R. Hillenbrand, T. Taubner, K. Keilmann, Nature, 418, 159, (2002)5 R. Carminati, J. J. Saenz, Phys. Rew. Lett., 84, 5156 (2000)

  • Sample ImagesCommon optical microscope

    Atomic force microscope

    TRSTM

  • Origin of the TRSTM Signal Atomic force microscopy TRSTM image when the tip is scanning 5m above TRSTM image when the tip and the sample are at room temperature

  • EM LDOS Measurement TRSTM images Numerical calculation of EM LDOS for different heights and stripe widthsSpatial coherence of thermal emission

  • z dependenceMost of the contribution comes from a small part of the tip.Tip geometryDemodulation frequencyThe contributing part is found to be3 for a demodulation frequency of 200nm for a demodulation frequency of 2

  • z dependence Image taken with a demodulation frequency of 2 Image taken with a band pass filter below the SiC resonance Image taken on a SiO2 substrate

  • EM LDOS at the BoundariesCavity for surface plasmons

  • ConclusionsThermal near field optical microscopy with 100nm resolution 2 orders of magnitude better than far field microscopy.First direct experimental demonstration of spatial coherence of thermal emission in the near field.Qualitative measurement of EM LDOS.

  • Questions?

  • Topographical artefact

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Thermal Radiation Scanning Tunneling Microscopy Yannick De Wilde, Florian Formanek, Remi Carminati, Boris Gralak, Paul-Arthur Lemoine, Karl Joulain, Jean-Philippe Mulet, Yong Chen, Jean-Jacques Greffet Nature, 444, 740, 7 December 2006 Presented by: F. Hakan Köklü
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