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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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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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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Photoelectric Effect02:26

Photoelectric Effect

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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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Experimental Determination of Chemical Formula02:37

Experimental Determination of Chemical Formula

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The elemental makeup of a compound defines its chemical identity, and chemical formulas are the most concise way of representing this elemental makeup. When a compound’s formula is unknown, measuring the mass of its constituent elements is often the first step in determining the formula experimentally.
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Related Experiment Video

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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

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Nanolayer-embedded pseudo-photonic crystals.

Byoung Jun Park1, Young-Ho Jin1, Nu-Ri Park1

  • 1KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 02841, Republic of Korea.

Nanotechnology
|August 22, 2019
PubMed
Summary

We introduce pseudo-photonic crystals (PPCs) for enhanced light-matter interaction with ultrathin nanolayers. These compact PPCs enable strong coupling for novel nanophotonic devices.

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Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation
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Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation

Published on: September 27, 2011

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Area of Science:

  • Nanophotonics
  • Materials Science
  • Condensed Matter Physics

Background:

  • Nanophotonic devices increasingly utilize ultrathin 2D nanolayer materials for high performance.
  • Standard 2D slab photonic crystals exhibit poor transverse-magnetic (TM) bandgaps, limiting TM waveguide mode operation.
  • Strong light-matter interaction is crucial for advanced nanophotonic applications.

Purpose of the Study:

  • To propose and analyze nanolayer-embedded compact pseudo-photonic crystals (PPCs).
  • To demonstrate enhanced interaction between ultrathin nanolayers and photonic crystal modes.
  • To overcome limitations of traditional photonic crystals for TM modes.

Main Methods:

  • Utilizing low-frequency TM PPC bands to achieve desired waveguide modes and bandgaps.
  • Embedding a low-refractive-index nanolayer within the PPC waveguide center.
  • Leveraging TM slow light near PPC band edges for enhanced field interaction.
  • Fabricating nanolayer-embedded PPC cavities with high quality factors (Q > 10^4).

Main Results:

  • Achieved readily available long propagation and slow TM waveguide modes.
  • Demonstrated strong electric field localization and interaction with embedded nanolayers.
  • Successfully created high-Q PPC cavities (> 10^4) using the TM PPC bandgap.
  • Confirmed significant enhancement of light-matter interaction through slow light effects.

Conclusions:

  • Proposed TM PPCs effectively enable strong interaction between ultrathin nanolayers and photonic crystal modes.
  • The developed PPCs offer a promising platform for novel nanophotonic devices.
  • This approach overcomes previous limitations in TM mode operation within photonic crystals.