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Related Concept Videos

Polar Coordinates: Problem Solving01:27

Polar Coordinates: Problem Solving

Directional radiation patterns are central to antenna analysis, as they illustrate how signal strength varies with direction. These patterns are often modeled using polar plots, where the radial distance from the origin represents signal intensity at a given angle. A commonly used idealized form is the four-lobed rose curve, which captures the concept of directional beams in a simplified mathematical form.The four-lobed rose curve, described by r = cos⁡(2θ), features four symmetric lobes, each...
Group Polarization01:01

Group Polarization

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.
Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

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,...
Polar Coordinate System01:30

Polar Coordinate System

The polar coordinate system provides a natural way to describe points in the plane when distances and directions are more meaningful than horizontal and vertical displacements. It is especially useful for modeling non-rectangular regions such as circles and spirals, where symmetry about a center point is easier to express than it is in a rectangular grid. A familiar example is a ship’s plan position indicator, which marks detected targets as dots positioned relative to the ship at the display’s...
Integration Applied to Polar Coordinates to Find Arc Lengths01:26

Integration Applied to Polar Coordinates to Find Arc Lengths

In polar coordinates, a plane curve is described by a radial distance r from a fixed point, called the pole, and an angle θ measured from a reference direction. This system is especially useful for paths that naturally involve rotation, such as an expanding spiral followed by a search drone. If the hiker’s last known position is treated as the pole, then the drone’s location at any instant can be represented by the polar equation r = f(θ), where the distance from the pole changes as the drone...
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

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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Related Experiment Video

Updated: Jun 22, 2026

Polarization-Sensitive Two-Photon Microscopy for a Label-Free Amyloid Structural Characterization
05:54

Polarization-Sensitive Two-Photon Microscopy for a Label-Free Amyloid Structural Characterization

Published on: September 8, 2023

Polarization coded aperture.

Wanli Chi, Kaiqin Chu, Nicholas George

    Optics Express
    |June 12, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Polarization coded apertures enhance optical system performance. These apertures increase lens depth of field and boost focal intensity for pixelated Fresnel zone plates, improving imaging quality for polarized or unpolarized light.

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    Polarization-Sensitive Two-Photon Microscopy for a Label-Free Amyloid Structural Characterization
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    Published on: September 8, 2023

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    07:56

    A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

    Published on: September 5, 2019

    Area of Science:

    • Optics and Photonics
    • Optical Engineering

    Background:

    • Traditional optical systems face limitations in depth of field and focal intensity.
    • Polarization manipulation offers a pathway to overcome these limitations.

    Purpose of the Study:

    • To demonstrate the advantages of polarization coded apertures in optical imaging.
    • To showcase enhanced performance in depth of field and focal intensity.

    Main Methods:

    • Utilizing polarization coded apertures where incoming light's polarization rotates at specific aperture portions.
    • Analyzing two distinct examples: a diffraction-limited lens and a pixelated Fresnel zone plate.

    Main Results:

    • Achieved increased depth of field for a diffraction-limited lens without compromising light throughput.
    • Demonstrated a 100% increase in axial focal intensity for a pixelated Fresnel zone plate.

    Conclusions:

    • Polarization coded apertures offer significant performance improvements in optical systems.
    • These apertures are effective for both linearly polarized and unpolarized illumination, broadening their applicability.