noun (used with a singular verb)
the study and technology of the use of light for the transmission of information.

1950–55; see photonic, -ics; perhaps on the model of electronics Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
photonics (fəʊˈtɒnɪks)
(functioning as singular) the study and design of devices and systems, such as optical fibres, that depend on the transmission, modulation, or amplification of streams of photons

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
photonics   (fō-tŏn'ĭks)  Pronunciation Key 
The scientific study or application of electromagnetic energy whose basic unit is the photon, incorporating optics, laser technology, electrical engineering, materials science, and information storage and processing.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
So with quantum dot materials you could achieve one of the holy grails of the photonics industry: a tunable laser.
Other companies have been developing silicon photonics as well.
Once-distinct boundaries between molecular biology, fluid mechanics, quantum mechanics and photonics are crossed.
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