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Related Concept Videos

Emission Spectra02:39

Emission Spectra

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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.
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A spontaneous process is one that occurs naturally under certain conditions. A nonspontaneous process, on the other hand, will not take place unless it is “driven” by the continual input of energy from an external source. Processes have a natural tendency to occur in one direction under a given set of conditions. Water will naturally flow downhill (spontaneous process), but uphill flow (nonspontaneous process) requires outside intervention such as the use of a pump. Iron exposed to...
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Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

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Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
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The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion.
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All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they...
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Related Experiment Video

Updated: Feb 3, 2026

Fabrication of White Light-emitting Electrochemical Cells with Stable Emission from Exciplexes
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Light-Emitting Metasurfaces: Simultaneous Control of Spontaneous Emission and Far-Field Radiation.

Sheng Liu1,2, Aleksandr Vaskin3, Sadhvikas Addamane4

  • 1Sandia National Laboratories , Albuquerque , New Mexico 87185 , United States.

Nano Letters
|October 20, 2018
PubMed
Summary

Researchers developed novel semiconductor metasurfaces for advanced lighting. These "smart lighting" devices offer enhanced brightness and controlled light directionality, paving the way for future optical technologies.

Keywords:
Fourier imagingMie-resonancesall-dielectric nanophotonicsdielectric nanoantennasspontaneous emission

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Area of Science:

  • Optoelectronics and Nanophotonics
  • Materials Science and Engineering

Background:

  • Light-emitting devices are integral to modern technology, including lighting, communications, and medicine.
  • Future advancements in "smart lighting" necessitate enhanced control over light emission spectra and directionality.
  • Novel light-matter interaction schemes and advanced light-emitting materials are crucial for next-generation lighting solutions.

Purpose of the Study:

  • To demonstrate the potential of all-dielectric metasurfaces with embedded emitters for revolutionary lighting concepts.
  • To explore the use of III-V semiconductor metasurfaces for advanced optical functionalities.
  • To investigate methods for enhancing brightness and controlling the directionality of light emission.

Main Methods:

  • Fabrication of Mie-resonant metasurfaces using semiconductor heterostructures.
  • Integration of epitaxial quantum dots as embedded light emitters within the metasurfaces.
  • Tuning of resonant mode symmetry and overlap with quantum dot emission spectra.
  • Optimization of structural parameters to control light emission properties.

Main Results:

  • Achieved a two-orders-of-magnitude enhancement in light source brightness.
  • Significantly reduced the far-field divergence of the emitted light.
  • Demonstrated the potential for multifunctional and highly directional lighting devices.

Conclusions:

  • All-dielectric metasurfaces incorporating III-V semiconductors and quantum dots offer a pathway to revolutionary lighting technologies.
  • The demonstrated control over emission properties surpasses the capabilities of existing lighting solutions.
  • This approach enables the development of smart lighting with unprecedented functionality and performance.