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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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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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Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels.  Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
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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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Characterization of Biological Absorption Spectra Spanning the Visible to the Short-Wave Infrared
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Absorption Engineering in an Ultrasubwavelength Quantum System.

Mathieu Jeannin1, Thomas Bonazzi1, Djamal Gacemi1

  • 1Laboratoire de Physique de l'Ecole Normale Supérieure, ENS, Paris Sciences et Lettres, CNRS, Université de Paris, 24 Rue Lhomond, 75005 Paris, France.

Nano Letters
|May 15, 2020
PubMed
Summary

Researchers developed a novel photonic structure using antenna-coupled meta-atoms to efficiently funnel light into nanoscale quantum wells. This breakthrough enhances light absorption for advanced quantum detectors and light-matter interaction studies.

Keywords:
Nanoscale absorbersmetamaterialsoptical antennasstrong light−matter coupling

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Area of Science:

  • Optics and Photonics
  • Metamaterials
  • Quantum Optics

Background:

  • Achieving ultrasubwavelength light confinement is crucial for various photonic and plasmonic applications.
  • Efficiently funneling external radiation into nanoscale volumes has remained a significant challenge.

Purpose of the Study:

  • To demonstrate a photonic concept for strong electromagnetic confinement and impedance matching to free space.
  • To develop an architecture for efficient light funneling into ultrasubwavelength absorbers.

Main Methods:

  • Designed antenna-coupled meta-atom resonators.
  • Integrated resonators with a semiconductor quantum well absorber of volume V = λ³10⁻⁶.
  • Investigated the funneling efficiency and light-matter interaction within the quantum well.

Main Results:

  • The proposed architecture funnels up to 90% of incident radiation into the ultrasubwavelength quantum well.
  • Achieved a photon absorption efficiency 550 times greater than the intrinsic electronic dipole value.
  • Demonstrated strong electromagnetic confinement and impedance matching to free space.

Conclusions:

  • The developed photonic concept successfully addresses the challenge of efficient light funneling into nanoscale volumes.
  • This system holds significant potential for developing ultralow dark current quantum detectors.
  • Opens new avenues for studying light-matter interactions in extreme regimes of electronic and photonic confinement.