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Related Concept Videos

Photoelectric Effect02:26

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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The Photochemical Reaction Center

Reaction centers are pigment-protein complexes that initiate energy conversion from photons to chemical entities. Therefore, photochemical reaction center is a more appropriate term that describes these complexes. The Nobel laureates Robert Emerson and William Arnold provided the first experimental evidence of photochemical reaction centers by demonstrating the participation of nearly 2,500 chlorophyll molecules for the release of just one molecule of oxygen. Despite thousands of photosynthetic...
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Thomson's e/m Experiment

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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Related Experiment Video

Updated: Jun 24, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Happy centenary, photon.

Anton Zeilinger1, Gregor Weihs, Thomas Jennewein

  • 1Institute for Experimental Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria. zeilinger-office@quantum.at

Nature
|January 22, 2005
PubMed
Summary
This summary is machine-generated.

Albert Einstein

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Area of Science:

  • Quantum Optics
  • Quantum Information Processing

Background:

  • Albert Einstein introduced the photon concept 100 years ago.
  • Early evidence for light's quantum nature was limited.
  • Modern experiments confirm light's corpuscular character.

Purpose of the Study:

  • To review the historical evidence for the photon concept.
  • To highlight the role of quantum optics in quantum information processing.
  • To discuss the future technological applications of quantum optics.

Main Methods:

  • Review of historical experiments on the quantum nature of light.
  • Analysis of modern experiments utilizing photon pairs.
  • Discussion of the evolution of quantum optics research.

Main Results:

  • Modern experiments, particularly with photon pairs, have confirmed the photon's corpuscular nature.
  • Quantum optics research has driven advancements in quantum information processing.
  • Quantum information processing promises revolutionary technologies.

Conclusions:

  • The photon concept, initially debated, is now experimentally validated.
  • Quantum optics is a foundational field for emerging quantum technologies.
  • Quantum cryptography and quantum computers are key future applications.