Download the presentation - Bruker

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