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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

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...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Imperfections in Crystal Structure: Point, Line and Plane Defects

A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Updated: May 21, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
11:08

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

Graded photonic quasicrystals.

Pavel N Dyachenko1, Vladimir S Pavelyev, Victor A Soifer

  • 1Image Processing Systems Institute of the Russian Academy of Sciences, 151 Molodogvardeiskaya Street, Samara 443001, Russia. dyachenko@ssau.ru

Optics Letters
|June 29, 2012
PubMed
Summary

We developed graded photonic quasicrystals for improved optical focusing. These new quasicrystal lenses offer superior performance compared to traditional photonic crystal lenses, enabling more compact optical systems.

Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Photonic crystals offer unique light manipulation properties.
  • Graded index materials are crucial for advanced optical components.

Purpose of the Study:

  • To introduce graded photonic quasicrystals.
  • To investigate their focusing properties using a Luneburg lens example.
  • To compare their performance against graded photonic crystal lenses.

Main Methods:

  • Design and simulation of a Luneburg lens based on a dodecagonal photonic quasicrystal.
  • Analysis of focusing properties of the proposed graded photonic quasicrystal lens.
  • Comparison with a graded photonic crystal lens.

Main Results:

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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials

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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

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  • The graded photonic quasicrystal lens demonstrates superior focusing capabilities.
  • Performance enhancement is observed within a frequency range suitable for experiments.
  • The proposed structures offer advantages over conventional graded photonic crystal lenses.
  • Conclusions:

    • Graded photonic quasicrystals represent a promising advancement in optical materials.
    • These quasicrystals enable the development of compact and high-performance focusing elements.
    • Potential applications include advanced optical systems requiring efficient focusing.