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Detection of ultrasound using a tunneling microscope
- Source :
- Journal of Applied Physics. 72:861-864
- Publication Year :
- 1992
- Publisher :
- AIP Publishing, 1992.
-
Abstract
- We 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.
- Subjects :
- acoustic sensing
Materials science
business.industry
Amplifier
General Physics and Astronomy
Acoustic wave
scanning electron microscopes
law.invention
Tunnel effect
Nonlinear system
tunneling
Optics
Time of arrival
Amplitude
surface reconstruction
law
acoustic microscopes
Scanning tunneling microscope
business
Quantum tunnelling
Subjects
Details
- ISSN :
- 10897550 and 00218979
- Volume :
- 72
- Database :
- OpenAIRE
- Journal :
- Journal of Applied Physics
- Accession number :
- edsair.doi.dedup.....09ab99d36cab49ba41fa0526085a20f8