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Title: New Quantum Dot Transistor Counts Individual Photons
Description: NIST's modified field-effect transistor can count single photons, or particles of light. When light enters through the transmission window (see electron micrograph of top of device), it penetrates the gallium arsenide absorbing layer and separates electrons from the "holes" they formerly occupied. Quantum dots (red dots) trap the positively charged holes, while electrons flow into the channel (green Xs). By measuring the channel current, researchers can determine the number of photons absorbed.


See also http://www.nist.gov/public_affairs/techbeat/tb2007_1011.htm#qdogfet.
Subjects (names):
Topics/Categories:
Type: Graphic/scientific data
Source: National Institute of Standards and Technology
Credit Line as it should
appear in print:
Credit: NIST
AV Number: 07EEEL011
Date Created: October 11, 2007
Date Entered: 10/11/2007

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