Single Photon Emission
Single Photon Emission - Related Videos
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Single Photon Emission Computed Tomography for Assessing Brain Function Disruption
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2025
A traumatic brain injury, or TBI, impairs blood flow to the impacted regions and disrupts the activity of dopaminergic neurons.To investigate TBI-associated disruptions, begin by intravenously injecting a lipophilic radioactive tracer into a patient.The tracer travels through the cerebral vessels and diffuses into cells of the cortical and subcortical brain tissue.Perform single photon emission computed tomography, or SPECT, to detect the tracer-emitted radiation. The resulting signal intensity...
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Emission Spectra
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2020
When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present. In contrast to continuous spectra, light can also occur as discrete or line spectra having very narrow linewidths interspersed throughout the spectral regions. Exciting a gas at low partial pressure using an electrical current,...
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Design and Use of a Full Flow Sampling System (FFS) for the Quantification of Methane Emissions
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Cited by 13 •
2016
We have designed, developed, and implemented a novel full flow sampling system (FFS) for quantification of methane emissions and greenhouse gases from across the natural gas supply chain.
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In Vivo Two-Photon Microscopy of Single Nerve Endings in Skin
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Cited by 13 •
2014
The protocol for dynamic longitudinal imaging and selective laser lesion of nerve endings in reporter transgenic mice is...
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Two-Photon In Vivo Imaging of the Mouse Retina
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2025
Source: Wang, Z., et al. Transpupillary Two-Photon In Vivo Imaging of the Mouse Retina. J. Vis. Exp. (2021).This video demonstrates a technique for in vivo retinal imaging using two-photon microscopy. Anesthetized mice are prepared for imaging by securing their heads, Applying eye lubricant, and placing a coverslip over the eye. Retinal ganglion cells (RGCs) expressing fluorescent proteins are first visualized using epifluorescence for alignment. Finally, two-photon imaging is employed,...
FAQs
Excitation prepares an isolated emitter in an excited state, after which it transitions to a lower-energy state and releases a photon. Engineering systems can initiate this sequence through either optical or electrical excitation. The choice of excitation route provides a way to control when emission occurs and supports source designs for communication, sensing, and photonic information processing.
Several isolated systems can serve as emitters, including atoms, molecules, defects, and semiconductor quantum dots. Their different physical forms provide alternative platforms for engineering a controlled optical source. Selecting among them helps researchers investigate how emitter properties affect photon wavelength, timing, and integration into optical or photonic circuits.
These measurements describe whether a source produces photons with the properties required by a particular system. Wavelength indicates the emitted optical energy, timing tracks when photons are released, and indistinguishability describes how consistently separate photons behave relative to one another. Together, the measurements help researchers assess source performance and determine integration suitability.
Producing photons individually gives engineers precise control over optical energy and information carried through a system. That control supports quantum communication and secure information processing, where the source must provide well-characterized optical events. The same capability can be incorporated into photonic circuits, allowing controlled light generation to contribute to emerging quantum technologies.
A practical workflow begins by exciting the selected emitter optically or electrically and then examining the resulting emission. Researchers characterize photon number, timing, wavelength, and indistinguishability before considering system integration. These measurements establish whether the source provides the controlled and consistent optical behavior needed for a targeted engineering application.
Engineering applications include quantum communication, optical sensing, secure information processing, and photonic circuits. In communication and information systems, controlled emission supports precise handling of optical information. For sensing, it can improve measurement sensitivity. In circuit development, source characterization helps determine whether an emitter can be incorporated into an emerging quantum photonic platform.
The engineering challenge extends beyond generating light: systems must control and evaluate the emitted photons before using them. Measurements of photon number, timing, wavelength, and indistinguishability provide design information for integrating sources into larger technologies. This connection links quantum emitters with practical source development, optical system design, and reliable operation of photonic circuits.