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Related Concept Videos

Spherical Coordinates01:23

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Spherical coordinate systems are preferred over Cartesian, polar, or cylindrical coordinates for systems with spherical symmetry. For example, to describe the surface of a sphere, Cartesian coordinates require all three coordinates. On the other hand, the spherical coordinate system requires only one parameter: the sphere's radius. As a result, the complicated mathematical calculations become simple. Spherical coordinates are used in science and engineering applications like electric and...
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Potential Due to a Polarized Object01:29

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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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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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A charge distribution has spherical symmetry if the density of charge depends only on the distance from a point in space and not on the direction. In other words, if the system is rotated, it doesn't look different. For instance, if a sphere of radius R is uniformly charged with charge density ρ0, then the distribution has spherical symmetry. On the other hand, if a sphere of radius R is charged so that the top half of the sphere has a uniform charge density ρ1 and the bottom half...
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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 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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Metasurface-Based Solid Poincaré Sphere Polarizer.

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Area of Science:

  • Optics and Photonics
  • Metamaterials
  • Nanotechnology

Background:

  • Conventional optical elements primarily control light's state of polarization (SOP).
  • Manipulation of light's degree of polarization (DOP) remains less explored.
  • Metasurfaces offer advanced light manipulation capabilities.

Purpose of the Study:

  • To propose and demonstrate metasurface-based polarizers capable of controlling both SOP and DOP.
  • To enable filtering of unpolarized light to any arbitrary polarization state and degree of polarization.
  • To explore new possibilities in polarization optics and related applications.

Main Methods:

  • Utilizing inverse design via the adjoint method to determine metasurface Jones matrix elements.
  • Fabricating prototype metasurface polarizers for near-infrared frequencies.
  • Experimentally characterizing the polarization conversion efficiency and DOP control.

Main Results:

  • Demonstrated metasurface polarizers that convert unpolarized light to linear, elliptical, and circular polarizations.
  • Achieved precise control over the degree of polarization (DOP), with demonstrated values of 1, 0.7, and 0.4.
  • Validated the capability to target arbitrary points on the Poincaré sphere.

Conclusions:

  • Metasurface polarizers offer a new degree of freedom for manipulating light polarization.
  • This technology unlocks advanced control over both SOP and DOP.
  • Potential applications include polarization calibration, quantum state tomography, and advanced optical systems.