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20 terms
Photonics Dictionary
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OEM x
OEM
original equipment manufacturer
intrinsic photoemission
The photoemission that would occur if a crystal were pure and its structure perfect.
MOEMS
micro-optoelectromechanical systems
photoemission
->
photoelectric emission
The electron emission from a substance or instrument whose surface has been bombarded by a suitable amount of radiation.
photoemissive cell
->
photoemissive detector
An electronic tube instrument in which the anode current varies with the intensity of light incident on the cathode.
photoemissive detector
An electronic tube instrument in which the anode current varies with the intensity of light incident on the cathode.
photoemissive effect
->
photoelectric effect
The emission of an electron from a surface that occurs when a photon impinges upon the surface and is absorbed. This effect is the means by which photons may be detected.
photoemissive tube photometer
A photometer that uses a photoemissive tube to detect and measure light. See photoelectric photometry.
photoemulsion
In photolithography, an opaque material used in masks that has a lower optical density and grainier composition than chrome.
ultraviolet photoemission spectroscopy
A technique for measuring the energy spectrum of electrons emitted during the absorption of ultraviolet radiation. This spectrum reveals the characteristic ionization energies of the molecules and...
cesium oxide cell
A photoemissive detector sensitive to wavelengths up to 1 µm. It has one sharp maximum of sensitivity at 350 nm and a broad maximum at 800 nm.
channel electron multiplier
A photoelectric detector consisting of a glass tube internally coated with a low conductance material. Voltage applied along the tube causes photoemission from the photocathode at the end of the tube...
continuous dynode electron multiplier
->
channel electron multiplier
A photoelectric detector consisting of a glass tube internally coated with a low conductance material. Voltage applied along the tube causes photoemission from the photocathode at the end of the tube...
gas photocell
A photoemissive cell having an inert gas added to its envelope. Subsequent ionization of the gas increases the responsivity of the photocell.
iconoscope
A camera tube that employs a high-velocity electron beam to scan a photoemissive mosaic and to store electrical charge patterns.
mosaic
One surface of a nonconducting plate that is coated with many minute particles of photoemissive material that are insulated from one another.
negative-electron-affinity photocathode
A photocathode having a P-type semiconductor with a work function less than its bandgap. The photocathode can release a hundredfold increase of photoemission in the infrared region.
photocathodes
Photocathodes are specialized materials or surfaces that exhibit the photoelectric effect, wherein the absorption of photons leads to the emission of electrons. When photons with sufficient energy...
photoelectric multiplier
A phototube in which the primary photoemission current, before being extracted at the anode, is multiplied many times.
Schottky-barrier IRCCD
A form of infrared CCD that utilizes internal photoemission as a photodetection mechanism.
Photonics Dictionary
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