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      Scanning probe microscope simulator for the assessment of noise in scanning probe microscopy controllers.

      1 , ,

      The Review of scientific instruments

      AIP Publishing

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          Abstract

          We present an electronic circuit that allows to calibrate and troubleshoot scanning probe microscopy (SPM) controllers with respect to their noise performance. The control signal in an SPM is typically highly nonlinear-the tunneling current in scanning tunneling microscopy (STM) varies exponentially with distance. The exponential current-versus-voltage characteristics of diodes allow to model the current dependence in STM. Additional inputs allow to simulate the effects of external perturbations and the reactions of the control electronics. We characterized the noise performance of the feedback controller using the apparent topography roughness of recorded images. For a comparison of different STM controllers, an optimal gain parameter was determined by exploring settling times through a rectangular perturbation signal. We used the circuit to directly compare the performance of two types of SPM controllers used in our laboratory.

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          Author and article information

          Affiliations
          [1 ] Institute of Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany.
          Journal
          Rev Sci Instrum
          The Review of scientific instruments
          AIP Publishing
          1089-7623
          0034-6748
          Jul 2013
          : 84
          : 7
          10.1063/1.4812636
          23902073

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