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Related Concept Videos

Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
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Recall that a particle in equilibrium is one for which the external forces are balanced. Static equilibrium involves objects at rest, and dynamic equilibrium involves objects in motion without acceleration; but it is important to remember that these conditions are relative. For instance, an object may be at rest when viewed from one frame of reference, but that same object would appear to be in motion when viewed by someone moving at a constant velocity.
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Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
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It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
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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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Spatial correlations and optical properties in three-dimensional deterministic aperiodic structures.

Michael Renner1, Georg von Freymann2

  • 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödinger-Str. 56. D-67663 Kaiserslautern, Germany.

Scientific Reports
|August 14, 2015
PubMed
Summary
This summary is machine-generated.

Deterministic aperiodic structures with controlled spatial correlations exhibit unique optical properties. These findings advance the understanding of light transport in complex photonic systems.

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Area of Science:

  • Photonics
  • Materials Science
  • Condensed Matter Physics

Background:

  • Photonic systems' optical properties depend on spatial correlations.
  • Photonic crystals have periodic correlations (Bravais lattices), while amorphous media lack long-range order.

Purpose of the Study:

  • Investigate optical properties of deterministic aperiodic structures.
  • Bridge the gap between periodic and amorphous photonic systems.
  • Systematically vary spatial correlation spectra (pure-point, singular-continuous, absolute-continuous).

Main Methods:

  • Fabricate 3D polymer structures using direct-laser writing.
  • Encode specific spatial correlation spectra within the structures.
  • Perform infrared reflection and transmission measurements.
  • Utilize micro-optical mirrors for in-plane transmission experiments.
  • Conduct numerical calculations for validation.

Main Results:

  • Successfully fabricated large deterministic aperiodic structures with desired correlations.
  • Infrared reflection measurements confirmed characteristic responses for each spectral type.
  • Transmission experiments revealed a strong dependence of effective beam width on the encoded lattice type.
  • Numerical calculations reproduced experimental transport behavior.

Conclusions:

  • Deterministic aperiodic structures offer tunable optical properties based on spatial correlations.
  • The study successfully links encoded spectral properties to observed optical behavior.
  • Findings validate the role of spatial correlations in light transport within these novel structures.