File:New Quantum Dot Transistor Counts Individual Photons (5941062028).jpg

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New_Quantum_Dot_Transistor_Counts_Individual_Photons_(5941062028).jpg ‎(625 × 469 pixels, file size: 69 KB, MIME type: image/jpeg)

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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.

Credit: NIST

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Source New Quantum Dot Transistor Counts Individual Photons
Author National Institute of Standards and Technology

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This image is in the public domain in the United States because it is a work of the United States Federal Government, specifically an employee of the National Institute of Standards and Technology, under the terms of Title 17, Chapter 1, Section 105 of the US Code.

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This image was originally posted to Flickr by National Institute of Standards and Technology at https://flickr.com/photos/63059536@N06/5941062028. It was reviewed on 7 September 2016 by FlickreviewR and was confirmed to be licensed under the terms of the United States Government Work.

7 September 2016

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current02:08, 7 September 2016Thumbnail for version as of 02:08, 7 September 2016625 × 469 (69 KB)Vanished Account Byeznhpyxeuztibuo (talk | contribs)Transferred from Flickr via Flickr2Commons

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