Optical Spectra
Optical Spectra - Related Videos
09:40
Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
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Cited by 9 •
2014
Time-resolved atomic and diatomic molecular species are measured using LIBS. The spectra are collected at various time delays following the generation of optical breakdown plasma with Nd:YAG laser radiation and are analyzed to infer electron density and temperature.
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,...
08:04
Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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Cited by 1 •
2020
Here, we present a protocol for parametrizing a tight-binding excitonic Hamiltonian for calculating optical absorption spectra and optoelectronic properties of molecular materials from first-principles quantum chemical calculations.
08:31
Three-dimensional Optical-resolution Photoacoustic Microscopy
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Cited by 27 •
2011
Optical-resolution photoacoustic microscopy (OR-PAM) is an emerging technology capable of imaging optical absorption contrasts in vivo with cellular resolution and sensitivity. Here, we provide a visualized instruction on the experimental protocols of OR-PAM, including system configuration, system alignment, typical in vivo experimental procedures, and functional imaging schemes.
09:39
Optical Biosensing
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2023
Optical biosensors utilize light to detect the binding of a target molecule. These sensors can utilize a label molecule, which produces a measurable signal such as fluorescence, or these sensors can be label-free and use the changes in optical properties, such as refractive index, to sense for the binding of the target molecule. This video introduces both label and label-free optical biosensors, demonstrates their use in the laboratory, and shows some applications of the technology.
FAQs
Peaks and bands provide characteristic evidence of electronic, vibrational, or structural properties. Their positions and intensity patterns can help distinguish materials, identify changes in composition or structure, and evaluate device behavior. In engineering, comparing these spectral features with expected patterns supports material identification and helps detect deviations that may indicate defects or processing problems.
Each measurement emphasizes a different interaction between light and matter. Emission records radiation produced by a material or device, while absorption indicates wavelengths removed from incident light. Reflection describes returned radiation, and transmission describes light passing through. Examining these responses separately or comparatively helps engineers assess how a component manipulates optical energy.
Defined measurement conditions make spectral results interpretable and comparable. The measured intensity distribution depends on how the optical signal is collected and separated, so uncontrolled changes can obscure meaningful differences between samples or devices. Consistent conditions allow engineers to distinguish genuine material, structural, or manufacturing changes from variations introduced during measurement.
A typical workflow begins by generating or collecting an optical signal from the sample, separating that signal into component wavelengths with a spectrometer, and measuring the resulting intensity distribution under defined conditions. Engineers then examine characteristic peaks or bands and compare the result with other spectra to evaluate material properties, device behavior, or process consistency.
They are useful when engineers need to evaluate how semiconductors or photonic devices interact with light. Spectral measurements can reveal characteristic material or structural behavior and show whether a device performs as expected. This information supports characterization of components used in lasers, detectors, displays, and other systems designed to generate, detect, or control optical signals.
Engineers can compare measured spectra across samples, production stages, or reference conditions to monitor manufacturing processes and identify deviations. Unusual peaks, bands, or intensity patterns may expose defects or changes in material behavior. The same comparisons support quality control by providing evidence that components meet expected optical characteristics before integration into larger systems.