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Title: Ultrafast, dynamical imaging of surfaces by use of a scanning tunneling microscope with a photoexcited, low-temperature-grown GaAs tip

Abstract

We demonstrate ultrafast dynamical imaging of surfaces, using a scanning tunneling microscope with a low-temperature-grown GaAs tip photoexcited by 100-fs, 800-nm pulses. We use this setup to detect picosecond transients on a coplanar stripline and demonstrate a temporal resolution (full width at half-maximum) of 1.7 ps. The temporal waveform resulting from our low-temperature-grown GaAs tip is compared with waveforms obtained by means of photoconductively gated metal tips in the same setup. By dynamically imaging the stripline we demonstrate that the local conductivity in the sample is reflected in the transient correlated current and that 20-nm spatial resolution is achievable for a 2-ps transient correlated signal. Finally, we report the characterization of a picosecond pulse propagating along the stripline for millimeter-scale distances. (c) 2000 Optical Society of America.

Authors:
 [1];  [1];  [1]
  1. Condensed Matter and Thermal Physics Group, MST-10, Materials Science and Technology Division, MS K764, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Publication Date:
OSTI Identifier:
20216532
Resource Type:
Journal Article
Journal Name:
Journal of the Optical Society of America. Part B, Optical Physics
Additional Journal Information:
Journal Volume: 17; Journal Issue: 6; Other Information: PBD: Jun 2000; Journal ID: ISSN 0740-3224
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; GALLIUM ARSENIDES; MICROSCOPY; SURFACE PROPERTIES; PHOTOCONDUCTIVITY; TRANSIENTS; ELECTRIC CURRENTS; EXPERIMENTAL DATA

Citation Formats

Donati, G. P., Rodriguez, G., and Taylor, A. J. Ultrafast, dynamical imaging of surfaces by use of a scanning tunneling microscope with a photoexcited, low-temperature-grown GaAs tip. United States: N. p., 2000. Web. doi:10.1364/JOSAB.17.001077.
Donati, G. P., Rodriguez, G., & Taylor, A. J. Ultrafast, dynamical imaging of surfaces by use of a scanning tunneling microscope with a photoexcited, low-temperature-grown GaAs tip. United States. doi:10.1364/JOSAB.17.001077.
Donati, G. P., Rodriguez, G., and Taylor, A. J. Thu . "Ultrafast, dynamical imaging of surfaces by use of a scanning tunneling microscope with a photoexcited, low-temperature-grown GaAs tip". United States. doi:10.1364/JOSAB.17.001077.
@article{osti_20216532,
title = {Ultrafast, dynamical imaging of surfaces by use of a scanning tunneling microscope with a photoexcited, low-temperature-grown GaAs tip},
author = {Donati, G. P. and Rodriguez, G. and Taylor, A. J.},
abstractNote = {We demonstrate ultrafast dynamical imaging of surfaces, using a scanning tunneling microscope with a low-temperature-grown GaAs tip photoexcited by 100-fs, 800-nm pulses. We use this setup to detect picosecond transients on a coplanar stripline and demonstrate a temporal resolution (full width at half-maximum) of 1.7 ps. The temporal waveform resulting from our low-temperature-grown GaAs tip is compared with waveforms obtained by means of photoconductively gated metal tips in the same setup. By dynamically imaging the stripline we demonstrate that the local conductivity in the sample is reflected in the transient correlated current and that 20-nm spatial resolution is achievable for a 2-ps transient correlated signal. Finally, we report the characterization of a picosecond pulse propagating along the stripline for millimeter-scale distances. (c) 2000 Optical Society of America.},
doi = {10.1364/JOSAB.17.001077},
journal = {Journal of the Optical Society of America. Part B, Optical Physics},
issn = {0740-3224},
number = 6,
volume = 17,
place = {United States},
year = {2000},
month = {6}
}