Near-infrared Emission
Near-infrared Emission - Related Videos
09:38
Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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Cited by 4 •
2015
We describe the generation of far-infrared radiation using an optically pumped molecular laser along with the measurement of their frequencies with heterodyne techniques. The experimental system and techniques are demonstrated using difluoromethane (CH2F2) as the laser medium whose results include three new laser emissions and eight measured laser frequencies.
08:18
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.
02:39
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,...
02:47
Metal Flame Emission - Concepts
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2020
Metal Flame Emission Flame testing is an analytical technique where a sample is placed in a flame, and the characteristic flame color is used to identify the substance. Each element has a characteristic light emission when placed into a flame, meaning each element produces a unique color. This phenomenon is used in fireworks displays, where the color of the fireworks corresponds to a specific characteristic of a metal. The emission of colored light from a burning sample is the direct result of...
10:12
Near-infrared Fluorescence Imaging of Abdominal Aortic Aneurysms
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2023
Source: Arvin H. Soepriatna1, Kelsey A. Bullens2, and Craig J. Goergen1 1 Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana 2 Department of Biochemistry, Purdue University, West Lafayette, Indiana Near-infrared fluorescence (NIRF) imaging is an exciting optical technique that utilizes fluorescent probes to visualize complex biomolecular assemblies in tissues. NIRF imaging has many advantages over conventional imaging methods for noninvasive imaging of diseases.
FAQs
The emission event follows excitation: molecules, semiconductor nanocrystals, or other materials move to a higher-energy state and then release photons as they return to a lower-energy state. The resulting optical signal provides a measurable readout of that transition. In bioengineering, selecting an appropriate emitting material helps match the optical signal to imaging or sensing goals.
Near-infrared emission can improve biological measurements because tissue may scatter these wavelengths less and produce less autofluorescence than under visible-light measurements. Lower background and reduced scattering can make signals easier to distinguish from surrounding tissue, supporting deeper-tissue imaging and noninvasive observation. The benefit is therefore tied to both tissue optics and the quality of the measured signal.
Different emitters provide alternative ways to generate the signal. Excited molecules, semiconductor nanocrystals, and other materials can all release near-infrared photons, while the selected emitting component depends on the design of the probe or device. This flexibility allows bioengineers to develop optical systems for sensing, imaging, cell tracking, or physiological monitoring rather than relying on one material class.
A practical measurement begins by choosing a near-infrared-emitting probe or device suited to the biological question, such as imaging tissue or sensing a target. The system then uses the emitted optical signal to produce an image or measurement, which can be interpreted in relation to cell location or physiological status. This workflow supports noninvasive analysis without requiring direct access to the tissue.
For engineered-cell studies, an emitting probe can provide a way to track where cells are located over time. The optical readout links the probe’s signal to the distribution of the engineered cells, while reduced scattering and autofluorescence associated with near-infrared wavelengths can support clearer observation in tissue. This makes the approach relevant to monitoring complex biological systems.
Applications extend beyond anatomical imaging. Near-infrared-emitting systems can support biosensing and monitoring of physiological processes, where the measured signal reports information about a biological condition or activity. In bioengineering, these capabilities help connect material design with system-level analysis, enabling researchers to study engineered cells and complex biological behavior through light-based, noninvasive measurements.