Photonics definitions

fō-tŏn'ĭks
The study or application of electromagnetic energy whose basic unit is the photon, using technology such as optics, lasers and other light sources, fiber optics, electrical engineering, and materials science in numerous applications including communications, electrical engineering, materials science, and information storage and processing.
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The branch of physics that deals with photons and their applications in telecommunication, data processing, etc.
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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.
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The science of the creation, control, and detection of radiant energy, the fundamental element of which is the photon. In other words, the study of the use of light. See also energy and photon.
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The science of generating and transmitting light (photons). Photonics deals with light starting in the infrared range, through visible light to ultraviolet light at the highest frequency. Most photonic systems use electricity and electronic circuits as their source of energy. See optoelectronics, silicon photonics and spectrum.
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(sciences) The science and technology of generating and controlling photons, particularly in the visible and near infrared light spectrum.
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Origin of photonics

photon (light) + -ics (pertaining to)