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Related Concept Videos

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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Updated: Oct 10, 2025

Performing Spectroscopy on Plasmonic Nanoparticles with Transmission-Based Nomarski-Type Differential Interference Contrast Microscopy
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Plasmonic color filter array based visible light spectroscopy.

Jyotindra R Shakya1, Farzana H Shashi1, Alan X Wang2

  • 1School of Electrical Engineering and Computer Science, Oregon State University, 1148 Kelley Engineering Center, Corvallis, OR, 97331, USA.

Scientific Reports
|December 9, 2021
PubMed
Summary
This summary is machine-generated.

Plasmonic color filters offer a simpler, cheaper alternative to traditional optical filters. This study demonstrates their use in visible light spectroscopy, reconstructing spectra with high accuracy for potential hyperspectral imaging applications.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Spectroscopy

Background:

  • Traditional Fabry-Perot optical filters present manufacturing complexities and high costs.
  • Plasmonic color filters offer a promising alternative for simplified and cost-effective optical filtering.
  • Resonant grating structures enable highly selective plasmonic color filters.

Purpose of the Study:

  • To demonstrate end-to-end visible light spectroscopy using a plasmonic color filter array.
  • To develop and apply a novel unmixing algorithm for spectral reconstruction.
  • To assess the feasibility of integrating plasmonic filters into hyperspectral imaging systems.

Main Methods:

  • Fabrication of a highly selective plasmonic color filter array based on resonant grating structure.
  • Measurement of spectra from six assorted samples using a 20-filter array.
  • Application of a new unmixing algorithm and least squares problem with smoothing regularization for spectral reconstruction.

Main Results:

  • Successful reconstruction of original spectra with a root mean squared error (RMSE) below 0.137.
  • Demonstration of high spectral selectivity using the plasmonic color filter array.
  • Validation of the unmixing algorithm for accurate spectral data recovery.

Conclusions:

  • Plasmonic color filter arrays show significant promise for advancing visible light spectroscopy.
  • The developed spectral reconstruction method achieves high accuracy.
  • This technology could lead to the integration of plasmonic filters in hyperspectral cameras, reducing complexity and cost.