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Scanning Tunneling Microscope.

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Dave Harris

on 2 June 2011

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Transcript of Scanning Tunneling Microscope.

How does a Scanning Tunnelling Microscope (STM) use principles of quantum mechanics to produce images of extremely small objects? What is Quantum Tunnelling? How Does This Microscope Work? Environment Economical Issue Technology "Quantum tunnelling (or tunnelling) is the quantum-mechanical effect of transitioning through a classically-forbidden energy state" An instrument used to produce images of surfaces at the atomic level The sun's energy is only possible because of Quantum tunnelling . A STM can only be used on samples that conduct electricity.
The tip of the STM ends with a single electron which is used to scan over the sample
Volts of electricity are passed through the tip and sample
Due to quantum tunnelling, the electron tunnel across from the tip to the sample or vice versa
The resulting current caused by the tunnelling is crucially dependent on the distance between the sample and the tip
By maintaining a constant current the height of the tip can be measured
This allows an image of the surface of the sample to be produced "Quantum Tunnelling: Coming To A Phone Near You" Samsung has announced that they will introduce Quantum Tunnelling Technology in their new upcoming touchscreen phone line. It is expensive!! $$$$ References
Introduction to Microscopy . (n.d.). The Free Information Society. Retrieved May 31, 2011, from http://www.freeinfosociety.com/article.php?id=118
Quantum Tunnelling : Scanning Tunnelling Microscopy. (n.d.). School of Chemistry. Retrieved May 31, 2011, from http://www.chm.bris.ac.uk/webprojects2000/plewis/STM.html
Quantum tunnelling. (n.d.). Science Daily. Retrieved May 31, 2011, from http://www.sciencedaily.com/articles/q/quantum_tunnelling.htm
Scanning Tunneling Microscope. (n.d.). Physical Measurement Laboratory. Retrieved May 31, 2011, from http://physics.nist.gov/GenInt/STM/text.html
Scanning Tunneling Microscope. (2006, September 4). A to Z Nanotechnology. Retrieved May 31, 2011, from http://www.azonano.com/article.aspx?ArticleID=1725
Scanning Tunneling Microscopy Overview. (n.d.). Nanoscience Instruments. Retrieved May 31, 2011, from http://www.nanoscience.com/education/STM.html
Woollacott, E. (n.d.). Quantum tunneling: coming to a phone near you | TG Daily. TG Daily . Retrieved May 31, 2011, from http://www.tgdaily.com/touch-screen/48347-quantum-tunneling-coming-to-a-phone-near-you
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