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Excelitas PCO GmbH - Industrial Camera 11-24 VS MR

AdTech Ceramics - Ceramic Packages 1-24 HP

8,726 terms

Photonics Dictionary

photon-rich

Photon-rich typically refers to an environment or situation where there is an abundance of photons present. In the context of optics, photon-rich environments are those where there is a high density...

photonegative

The property exhibited by a substance having electrical conductivity that decreases as the intensity of the incident visible radiant energy increases.

photonic computer

A type of computer in which the electronic circuits, which process data serially, are replaced by photonic circuits capable of parallel processing and thus of much greater speed and power. Where the...

photonic crystal surface-emitting laser

A photonic crystal surface-emitting laser (PCSEL) refers to a type of laser diode that emits light from its surface rather than from the edges. Photonic crystals are periodic nanostructures that...

photonic crystals

Photonic crystals are artificial structures or materials designed to manipulate and control the flow of light in a manner analogous to how semiconductors control the flow of electrons. Photonic...

photonic engine

A photonic engine refers to a device or system that utilizes photonics, or the science and technology of generating, controlling, and detecting photons (particles of light), to perform various...

photonic integrated circuit

A photonic integrated circuit (PIC) is a compact and integrated device that incorporates multiple photonic components and functions on a single chip, similar to the way electronic integrated circuits...

photonics

The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The science includes light emission, transmission, deflection, amplification and...

photonic cavity

A photonic cavity, also known as an optical cavity, is a structure that confines electromagnetic radiation within a certain region or volume. It is typically composed of materials with different...

photonics contract manufacturing

Photonics contract manufacturing refers to the outsourcing of the production of photonics-related components, devices, or systems to specialized manufacturing firms. Photonics involves the...

photopic vision

Vision by means of retinal cones; color vision. Relatively high levels of luminance are required for photopic vision.

photoplethysmography

Photoplethysmography (PPG) is a non-invasive optical technique used to detect changes in blood volume in tissues. It measures variations in light absorption caused by the pulsatile nature of blood...

photopolymer hologram

A holographic plate coated by photopolymeric mixtures that are composed of one or more monomers and a photoredox catalyst sensitized to visible light. The material becomes a plastic solid when...

photopolymer

A polymer produced as a result of photochemical processes.

photopolymerization

A process in which a mixture of one or more monomers, plus a catalyst, polymerize under exposure to light radiation. Photopolymerization permits a hologram to be exposed, fixed and reconstructed in...

photopumping

The use of light to initiate the lasing process. See optical pumping.

photoradiation therapy -> photodynamic therapy

A medical technology that uses lasers or other light sources in combination with photosensitizing drugs to treat cancerous tumors.

photoreactive agent

Participates in a reaction only in the presence of light and radiant energy. Besides 3D printing, photoreactive agents also have an application in light therapy. By absorbing light, photoreactive...

photoreflectance

A noncontact form of electromodulation in which modulation of the electric field is caused by photo-excited electron-hole pairs from a pump source.

photorefractive keratectomy

A surgical procedure for correcting vision by reshaping the outer surface of the cornea through the use of a laser system.

photorefractive material

A material in which the refractive index varies according to changes in the light to which it is exposed. Lithium niobate is one example.

photoresist

Photoresist is a light-sensitive material used in photolithography processes, particularly in the fabrication of semiconductor devices, integrated circuits, and microelectromechanical systems (MEMS)....

photoresponse nonuniformity

Noise created by patterns imaged on a CCD surface. Pixel sensitivity is altered by responsivity during illumination.

photosensitive recording

The recording achieved when a surface, illuminated by a signal-controlled light beam, emits electrons or reacts in some manner.

photosensitivity

That property of a material indicating that it will react when exposed to light energy.

photosensitizer

A substance that increases a material's sensitivity to electromagnetic irradiation. In photodynamic therapy, a drug used to render a target tissue sensitive to laser light.

photosite

A small section of the surface of a sensor corresponding to a single pixel in the image.

photosphere

The apparent surface of the sun or a star from which light appears to radiate.

photostatic camera

A type of copying camera in which the object is placed on a horizontal easel and photographed by a horizontal camera above the easel through a 90° reversing prism. The image is recorded on a...

photostore

The photographic recording of data, in binary form, for storage in memory. Exposure is achieved by a cathode-ray tube or by modulating a continuous-wave laser beam with a Kerr cell, both relative to...

photosurface

The surface from which electrons are ejected by the incidence and absorption of photons.

photoswitch

A solid-state device that acts as a high-speed power switch, and that is activated by incident radiation.

photosynthetically active radiation

Photosynthetically active radiation (PAR) is the 400- to 700-nm region (visible light) of the electromagnetic spectrum that is absorbed and used by the plant for photosynthesis. Also referred to as...

phototelegraphy

A document-transmitting process that uses a cylinder that rotates the document to be scanned and detected by a photoelectric cell. The cell transforms the light into electrical energy that may be...

phototheodolite

A camera equipped with angular scales in altitude and azimuth. The scale readings are imprinted on the film when an exposure is made. The exact point indicated by the scale readings is shown by...

phototheranostics

Phototheranostics, a portmanteau of "photo" (light), "therapy," and "diagnostics," refers to an emerging field that combines therapeutic and diagnostic capabilities in a single platform, often...

phototherapy

Phototherapy is a medical treatment that involves the use of light to treat various conditions, particularly those related to the skin or mood disorders. There are different types of phototherapies,...

photothermal effect

The cause of some forms of laser injury in which tissue absorbs incident laser light and experiences a damaging rise in temperature. The severity of the damage is dependent on the rate of energy...

phototoxicity

Phototoxicity refers to the harmful effects caused by exposure to light, particularly intense or ultraviolet (UV) light, on living cells or organisms. This phenomenon is often associated with the...

phototransistor tachometer

A tachometer consisting of a light source, rotating perforated wheel and phototransistor to measure the rates of rotation of components. The phototransistor counts the flashes formed when the wheel,...

phototransistor

A phototransistor is a type of semiconductor device that converts light energy into electrical signals. Similar to a regular transistor, it consists of a semiconductor material (such as silicon) with...

phototriangulation -> analytical phototriangulation

The use of photographs taken from specially placed cameras, to develop, through computation, a spatial solution of the photographed phenomenon.

phototube

An electron tube having a photocathode for the emission of a photoelectric current.

phototube relay

A photoelectrical relay that uses a phototube as its photoelectric device to open and close an electrical relay; used to activate counters and safety controls.

photovoltaic cell

A photovoltaic cell, commonly known as a solar cell, is a semiconductor device that directly converts light energy into electrical energy through the photovoltaic effect. The photovoltaic effect is...

photovoltaic detector -> photovoltaic cell

photovoltaic effect

The generation of a difference in electric potential between two electrodes when radiation is incident on one of them.

photovoltaic

Photovoltaic (PV) refers to a technology that converts sunlight directly into electricity using semiconductors. The term "photovoltaic" is derived from the words "photo," meaning light, and...

photronic cell

A photovoltaic cell usually sensitive to infrared radiation. It may have a copper base and a film of cuprous oxide. When it is irradiated, voltage is produced.

physical optics

The branch of science that treats light as a wave phenomenon wherein light propagation is studied by wavefronts rather than rays, as in geometric optics.

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