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Related Concept Videos

Forced Oscillations01:06

Forced Oscillations

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When an oscillator is forced with a periodic driving force, the motion may seem chaotic. The motions of such oscillators are known as transients. After the transients die out, the oscillator reaches a steady state, where the motion is periodic, and the displacement is determined.
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Standing Waves in a Cavity01:28

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Damped Oscillations01:07

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In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
Although friction and other non-conservative...
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Oscillations In An LC Circuit01:30

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An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
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Oscillations about an Equilibrium Position01:04

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Stability is an important concept in oscillation. If an equilibrium point is stable, a slight disturbance of an object that is initially at the stable equilibrium point will cause the object to oscillate around that point. For an unstable equilibrium point, if the object is disturbed slightly, it will not return to the equilibrium point. There are three conditions for equilibrium points—stable, unstable, and half-stable. A half-stable equilibrium point is also unstable, but is named so...
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The Wave Nature of Light02:12

The Wave Nature of Light

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The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion.
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Updated: Dec 15, 2025

Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
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Light beams with volume superoscillations.

Thomas Zacharias, Alon Bahabad

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    Summary
    This summary is machine-generated.

    Researchers created a novel optical beam with unprecedented simultaneous axial, angular, and radial focusing. This breakthrough surpasses the Fourier limit, offering new possibilities for optical particle manipulation and microscopy.

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    Area of Science:

    • Optics and Photonics
    • Quantum Optics

    Background:

    • The diffraction limit restricts the resolution of optical systems.
    • Achieving simultaneous sub-diffraction focusing in multiple dimensions is a significant challenge.

    Purpose of the Study:

    • To develop an optical beam capable of simultaneous axial, angular, and radial focusing beyond the classical Fourier limit.
    • To explore applications in optical particle manipulation and high-resolution microscopy.

    Main Methods:

    • Superposition of shifted Bessel beams with varying longitudinal wave vectors.
    • Superposition of shifted Bessel beams with varying orbital angular momenta.

    Main Results:

    • Demonstrated an optical beam with simultaneous axial, angular, and radial focusing.
    • Achieved focusing narrower than the conventional Fourier limit.

    Conclusions:

    • The developed optical beam offers enhanced focusing capabilities.
    • Potential applications include advanced optical particle manipulation and super-resolution microscopy.