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Related Concept Videos

Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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Two-Dimensional (2D) NMR: Overview01:12

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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
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Dielectric Polarization in a Capacitor01:31

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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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Curvilinear Motion: Polar Coordinates01:27

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In polar coordinates, the motion of a particle follows a curvilinear path. The radial coordinate symbolized as 'r,' extends outward from a fixed origin to the particle, while the angular coordinate, 'θ,' measured in radians, represents the counterclockwise angle between a fixed reference line and the radial line connecting the origin to the particle.
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Group Polarization01:01

Group Polarization

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Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition.
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Polar and Cylindrical Coordinates01:22

Polar and Cylindrical Coordinates

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The Cartesian coordinate system is a very convenient tool to use when describing the displacements and velocities of objects and the forces acting on them. However, it becomes cumbersome when we need to describe the rotation of objects. So, when describing rotation, the polar coordinate system is generally used.
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Updated: Aug 21, 2025

Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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Two-dimensional natural hyperbolic materials: from polaritons modulation to applications.

Guangyi Jia1, Jinxuan Luo1, Huaiwen Wang1,2

  • 1School of Science, Tianjin University of Commerce, Tianjin 300134, P. R. China. wanghw@tjcu.edu.cn.

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Two-dimensional (2D) natural hyperbolic materials exhibit high anisotropy, enabling hyperbolic polaritons for sub-wavelength light manipulation. These materials offer promising applications in quantum photonics and advanced optoelectronics.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanophotonics

Background:

  • Two-dimensional (2D) natural hyperbolic materials (HMs) possess unique anisotropic optical properties.
  • Their hyperbolic dispersion relation supports phenomena like hyperbolic polaritons.
  • These polaritons enable directional propagation and deep sub-wavelength light compression.

Purpose of the Study:

  • To review the anisotropic optical features of 2D natural HMs.
  • To discuss the generation mechanisms of four types of hyperbolic polaritons: phonon, plasmon, exciton, and shear polaritons.
  • To highlight the potential applications of 2D HMs in quantum photonics and optoelectronics.

Main Methods:

  • Review of existing literature on 2D natural hyperbolic materials.
  • Detailed discussion of hyperbolic polariton types and their generation.
  • Analysis of potential applications based on material properties.

Main Results:

  • 2D natural HMs exhibit extraordinary anisotropy and hyperbolic dispersion.
  • Four types of hyperbolic polaritons are identified and their generation mechanisms explained.
  • Demonstrated potential for applications in valley quantum interference, mid-infrared polarizers, spontaneous emission enhancement, and near-field thermal radiation.

Conclusions:

  • 2D natural HMs offer significant promise for advanced quantum photonic and optoelectronic applications.
  • Existing challenges and future research directions for 2D HMs are outlined.
  • Further interest in anisotropic 2D atomic crystals and natural HMs is anticipated.