GHz Apertureless Near-Field Scanning Optical Microscopy of Ferroelectric Nanodomain Dynamics

Hongzhou Ma and Jeremy Levy*
University of Pittsburgh, Department of Physics and Astronomy, Pittsburgh, Pennsylvania 15260
Nano Lett., 2006, 6 (3), pp 341–344
DOI: 10.1021/nl052415u
Publication Date (Web): February 11, 2006
Copyright © 2006 American Chemical Society
Optical, Electron, and Mass Spectroscopy and Other Related Properties

Abstract

Abstract Image

Nanoscale domain dynamics of (Ba,Sr)TiO3 thin films are investigated at microwave frequencies with a home-developed GHz-frequency apertureless near-field scanning optical microscope (GHz-ANSOM). Using a microwave phase-modulation technique, we decoupled topographic artifacts from the optical signal, providing an enhanced and background-free temporal response. Interleaved acquisition of images taken at sequential time intervals provides amplitude and phase information about the electrooptic response at <50 nm spatial resolution and <10 ps temporal resolution. The local microwave response is highly nonuniform in both the amplitude and the phase.

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    History

    • Published In Issue March 08, 2006
    • Received December 7, 2005
      Revised Manuscript Received January 17, 2006

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