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Relating Angular And Linear Quantities - I01:09

Relating Angular And Linear Quantities - I

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If the rotational definitions are compared with the definitions of linear kinematic variables from motion along a straight line and motion in two and three dimensions, we can observe a mapping of the linear variables to the rotational ones.
When comparing the linear and rotational variables individually, the linear variable of position has physical units of meters, whereas the angular position variable has dimensionless units of radians, as it is the ratio of two lengths. The linear velocity...
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Relating Angular And Linear Quantities - II01:05

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In the case of circular motion, the linear tangential speed of a particle at a radius from the axis of rotation is related to the angular velocity by the relation:
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Rotation with Constant Angular Acceleration - I01:37

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If angular acceleration is constant, then we can simplify equations of rotational kinematics, similar to the equations of linear kinematics. This simplified set of equations can be used to describe many applications in physics and engineering where the angular acceleration of a system is constant.
Using our intuition, we can begin to see how rotational quantities such as angular displacement, angular velocity, angular acceleration, and time are related to one another. For example, if a flywheel...
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Rotation with Constant Angular Acceleration - II01:16

Rotation with Constant Angular Acceleration - II

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Kinematics is the description of motion. The kinematics of rotational motion discusses the relationships between rotation angle, angular velocity, angular acceleration, and time. One can describe many things with great precision using kinematics, but kinematics does not consider causes. For example, a large angular acceleration describes a very rapid change in angular velocity without any consideration of its cause. Thus, rotational kinematics does not represent the laws of nature.
The first...
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Molecular Shape and Polarity03:37

Molecular Shape and Polarity

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Dipole Moment of a Molecule
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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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Related Experiment Video

Updated: Feb 10, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

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Reflectionless Linear Polarization Rotators with Angular Robustness.

Hadi Ahmadi1, Sanchita Sarker1, Mohammad Parvinnezhad Hokmabadi1

  • 1Electrical and Computer Engineering Department, University of North Carolina at Charlotte, Charlotte, North Carolina 28223, United States.

ACS Omega
|February 9, 2026
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Summary

Researchers developed a compact terahertz metasurface for polarization optics. This novel chiral bilayer design achieves near-zero reflection and precise polarization rotation, enabling scalable fabrication for advanced optical systems.

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Last Updated: Feb 10, 2026

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Area of Science:

  • Optics and Photonics
  • Metamaterials
  • Nanotechnology

Background:

  • Integrated polarization optics requires compact, alignment-free rotators with low reflection and constant thickness for scalable fabrication.
  • Existing solutions like natural optical rotators or complex metasurfaces have limitations in size, alignment, or fabrication compatibility.

Purpose of the Study:

  • To numerically design a novel terahertz chiral bilayer metasurface.
  • To achieve prescribed linear-polarization rotations with near-zero reflection over a wide range of incident angles.
  • To ensure the design is compatible with wafer-level fabrication.

Main Methods:

  • Numerical design of a terahertz chiral bilayer metasurface utilizing 4-fold rotational (C4) symmetry.
  • Exploiting C4 symmetry to eliminate cross-polarized reflection.
  • Implementing destructive interference to minimize copolarized reflectivity at a target resonance.

Main Results:

  • The designed metasurface achieves prescribed linear-polarization rotations with near-zero reflection.
  • Reflectionless response is maintained across diverse rotation angles at a constant device thickness.
  • The structure exhibits strong angular robustness, remaining reflectionless for incidence angles up to ~20°.

Conclusions:

  • The developed terahertz metasurface offers a compact, alignment-free solution for polarization rotation with low reflection.
  • This design overcomes limitations of natural optical rotators and existing metasurfaces, enabling scalable wafer-level fabrication.
  • Potential applications include secure optical communications, parallel photonic processing, and advanced imaging.