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How the near field light (E nf ) is detected:Background Suppression andInterferometric DetectionsSNOM schematic:MM = moving mirrorPM = parabolic mirrorBS = beam splitterMCT = HgCdTe IR detectorE refE nf +E bgDetector Voltage: V det ∝ EE ∗ = |E ref +E nf +E bg | 2Goals of the detection scheme:1. Suppress the background, E bg , contributions to detector voltage V det2. Perform a phase sensitive measurement of E nf6/27/13 Bruker Nano Surfaces11
How the near field light (E nf ) is detected:Background Suppression andInterferometric DetectionTapping mode:E bgE nf +E bgsSNOM schematic:MM = moving mirrorPM = parabolic mirrorBS = beam splitterMCT = HgCdTe IR detectorE refE nf +E bgDetector Voltage: V det ∝ EE ∗ = |E ref +E nf +E bg | 2∝ E ref E nf cos φ ref − φ nf + E bg E nf cos φ bg − φ nf + E ref E bg cos φ ref − φ bgDesired termSuppressed terms:+ E ref2+ |E nf | 2 + |E bg | 26/27/13 Bruker Nano Surfaces12
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 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 20 and 21: Infrared study of Graphene: rich sp
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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