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Related Concept Videos

UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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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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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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Van der Waals Interactions01:24

Van der Waals Interactions

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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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UV–Vis Spectroscopy of Conjugated Systems01:32

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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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Related Experiment Video

Updated: Aug 24, 2025

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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Miniaturized spectrometers with a tunable van der Waals junction.

Hoon Hahn Yoon1,2, Henry A Fernandez1,2, Fedor Nigmatulin1,2

  • 1Department of Electronics and Nanoengineering, Aalto University, Espoo 02150, Finland.

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|October 20, 2022
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Researchers developed a miniaturized computational spectrometer using a single van der Waals junction. This device achieves high accuracy, resolution, and broad bandwidth for spectral imaging applications.

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Area of Science:

  • Optoelectronics
  • Spectroscopy
  • Materials Science

Background:

  • Miniaturized spectrometers are crucial for on-chip and implantable devices.
  • Single-detector systems offer reduced footprint and high spectral resolution.
  • Existing technologies face limitations in accuracy, resolution, and bandwidth.

Purpose of the Study:

  • To develop a high-performance miniaturized computational spectrometer.
  • To achieve ultraminiaturization for on-chip and implantable applications.
  • To enhance spectral measurement accuracy, resolution, and operational bandwidth.

Main Methods:

  • Utilized a single van der Waals junction with an electrically tunable response.
  • Employed computational reconstruction algorithms with device spectral responses.
  • Demonstrated proof-of-concept spectral imaging capabilities.

Main Results:

  • Achieved high peak wavelength accuracy of ~0.36 nanometers.
  • Obtained high spectral resolution of ~3 nanometers.
  • Covered a broad operation bandwidth from ~405 to 845 nanometers.

Conclusions:

  • The developed van der Waals junction computational spectrometer offers unprecedented performance.
  • This approach enables ultraminiaturization for advanced spectral measurement.
  • The technology paves the way for next-generation on-chip and implantable spectrometers.