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Related Concept Videos

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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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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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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Novel smart window using photonic crystal for energy saving.

Zaky A Zaky1, Arafa H Aly2

  • 1TH-PPM Group, Physics Department, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt. zaky.a.zaky@science.bsu.edu.eg.

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|June 17, 2022
PubMed
Summary

This study introduces a novel photonic crystal smart window that blocks near-infrared solar radiation without external energy. This innovation offers a passive solution for reducing building energy consumption.

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Area of Science:

  • Materials Science
  • Optics
  • Sustainable Building Technologies

Background:

  • Smart windows are crucial for reducing building energy consumption.
  • Current smart windows often require external energy sources to operate.
  • Further research is needed for energy-efficient, wide-operating range smart windows.

Purpose of the Study:

  • To propose a novel smart window design utilizing photonic crystals.
  • To regulate solar radiation intensity passively, reducing building heat gain.
  • To demonstrate a room-temperature operating photonic crystal for smart windows.

Main Methods:

  • Development of a novel smart window structure incorporating photonic crystals.
  • Characterization of the photonic crystal's ability to block solar radiation.
  • Evaluation of the smart window's performance at room temperature.

Main Results:

  • The proposed photonic crystal smart window effectively blocks approximately 400 nm of near-infrared solar radiation.
  • The smart window operates passively, requiring no additional heat or electrical input.
  • Demonstration of a functional photonic crystal smart window at room temperature.

Conclusions:

  • The novel photonic crystal smart window offers an energy-efficient solution for solar radiation management.
  • Passive operation eliminates the need for external power, enhancing sustainability.
  • This technology has the potential to significantly reduce cooling loads in buildings.