photo-, phot-, -photic
(Greek: light; ultraviolet and infrared radiation; radiant energy)
2. Close-up photography at a limiting magnification of 40 times, or in that zone.
2. A morbid or exaggerated desire for light.
3. Maniacal symptoms increased by the effect of light.
2. A device for measuring the intensity of infrared, ultraviolet, or visible light.
3. A device for testing the sensitivity of the eye to light by determining the light minimum.
2. Measuring the characteristics of visible radiation (light); such as, its luminous intensity or illuminance, relative to standard references.
2. An enlarged photograph of an object viewed with a microscope, as distinguished from a microphotograph.
2. A reaction in which the plant sows changes in growth and development caused by visible light independent of photosynthesis.
2. The quantum of the electromagnetic field that manifests itself by absorption or emission only in multiple quantum units of energy.
3. A unique massless particle that carries electromagnetic force.
The opening and closing of evening primrose flowers upon exposure to dark and light is one example.
Just as electronic bandgaps (energy difference between a non-conductive state and the conductive state) prevent electrons from passing through, photonic crystals create photonic bandgaps that confine light.
This technology increases the efficiency in optical fibers and allows microscopic lasers to be built. It is also expected to be used in the construction of photonic circuits that can stand alone or be integrated into semiconductor circuits.
Earlier prototype electronic inks could display just two color values (usually black and white); however, photonic ink can display any color value in the spectrum.
Among other applications, photonic ink can be used for refreshable, full-color images in an electronic newspaper, to coordinate pictures with updated newspaper content; as well as, in electronic books.
Photonic ink displays color through a controlled diffraction, a special type of interference which is responsible for the iridescent color effects of opals and butterfly wings.
Photonics is an area of study centering around the generation and utilization of radiant energy; such as, light for various applications.