photo-, phot-, -photic

(Greek: light; ultraviolet and infrared radiation; radiant energy)

photoma
The sensation of seeing light flashes.
photomacrography
1. A technique for investigating and recording conditions and procedures involving small objects that ordinarily would be inspected through a loupe rather than a microscope.
2. Close-up photography at a limiting magnification of 40 times, or in that zone.
photomagnetism
Magnetism induced by the action of light.
photomania
1. An irresistible craving for light or the sun (heliolatry).
2. A morbid or exaggerated desire for light.
3. Maniacal symptoms increased by the effect of light.
photometer
1. An instrument used in measuring the intensity of light, especially in determining the relative intensity of light from different sources.
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.
photometry
1. The measurement of the visible portion of radiant energy (light).
2. Measuring the characteristics of visible radiation (light); such as, its luminous intensity or illuminance, relative to standard references.
photomicrograph
A photograph taken through a microscope.
photomicrography
1. The art of obtaining photographs of microscopic objects on a magnified scale.
2. An enlarged photograph of an object viewed with a microscope, as distinguished from a microphotograph.
photomorphogenesis
1. The regulation of a form by light, as in the induction of flowering in plants by a minimal period of daylight.
2. A reaction in which the plant sows changes in growth and development caused by visible light independent of photosynthesis.
photon
1. The quantum of electromagnetic radiation, which by definition, travels at the speed of light.
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.
photonasty, photonastic, photonastically
One-sided growth due to the action of light.

The opening and closing of evening primrose flowers upon exposure to dark and light is one example.

photonephography
The process of taking a succession of simultaneous photographs of a cloud from two points at some distance apart, in order to ascertain the height and movement of the cloud.
photonic crystal
A nanostructured array of holes used as an optical semiconductor.

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.

photonic ink, P-Ink
A substance which can change colors electronically.

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, photronics
Products and technologies that operate using light energy; such as, the term of photons which is combined with electronics; including optical components, imaging sensors and systems, lasers, and fiber optics.

Photonics is an area of study centering around the generation and utilization of radiant energy; such as, light for various applications.

Etymologically related "light, shine, glow" word families: ethero-; fulg-; luco-; lumen-, lum-; luna, luni-; lustr-; phengo-; pheno-; phospho-; scinti-, scintill-; splendo-.