Detection of ultrasound using a tunneling microscope

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Journal titleJournal of Applied Physics
Pages861864; # of pages: 4
Subjectacoustic sensing; tunneling; scanning electron microscopes; surface reconstruction; acoustic microscopes
AbstractWe have developed a scanning tunneling microscope capable of detecting high frequency (1.8–12.5 MHz) acoustic waves. Acoustic pulses arriving at a conducting surface are detected as a high frequency perturbation of the tunneling current. Near and below the rolloff frequency of the current to voltage amplifier, the instantaneous displacement of the surface can be reconstructed. For higher frequencies, the nonlinear (rectifying) properties of the tunneling behavior allow the detection of the envelope (and hence the time of arrival and total amplitude) of the acoustic burst. The technique’s sensitivity is comparable to that of optical detection schemes but offers much better lateral resolution.
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NPARC number21273068
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Record identifier071f9a29-255d-426b-b554-28f8eae3f1ec
Record created2014-12-11
Record modified2016-05-09
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