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Related Concept Videos

Rectangular and Triangular Pulse Function01:19

Rectangular and Triangular Pulse Function

The unit rectangular pulse function is mathematically represented by a rectangular function centered at the origin with a height of one unit. This function is defined by two parameters: T, which specifies the center location of the pulse along the time axis, and τ, which determines the pulse duration.
For example, consider a rectangular pulse with a 5V amplitude, a 3-second duration, and centered at t=2 seconds. This pulse can be expressed using the rectangular function, written as,
Propagation of Waves01:07

Propagation of Waves

When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Wave Parameters01:10

Wave Parameters

The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be modeled using a combination of sine and cosine functions. Consider a simplified surface water wave that moves across the water's surface. Unlike complex ocean waves, in surface water waves, water moves vertically, oscillating up and down, whereas the disturbance of the wave moves horizontally through the medium. If a seagull is floating on the...
Reflection of Waves01:07

Reflection of Waves

When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
Shock Waves01:16

Shock Waves

While deriving the Doppler formula for the observed frequency of a sound wave, it is assumed that the speed of sound in the medium is greater than the source's speed through it. When this condition is breached, a shock wave occurs.
When the source's speed approaches the speed of sound, constructive interference between successive wavefronts emitted by the source occurs immediately behind it. Initially, scientists believed that this constructive interference would result in such high pressures...

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Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing
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Published on: February 13, 2018

Temporal pulse reshaping with surface waves.

R V Andaloro, H J Simon, R T Deck

    Applied Optics
    |October 14, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study explores how short optical pulses change shape when reflected from metal films, revealing conditions for observable pulse reshaping. Researchers analyzed surface-plasmon modes and identified diffraction as a key limiting factor for experimental observation.

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    Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations

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    Last Updated: Jun 8, 2026

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    08:54

    Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing

    Published on: February 13, 2018

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    Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
    06:51

    Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations

    Published on: August 21, 2018

    Area of Science:

    • Optics and Photonics
    • Condensed Matter Physics
    • Materials Science

    Background:

    • Surface-plasmon polaritons (SPPs) are electromagnetic waves confined to the interface between a conductor and a dielectric.
    • Excitation of SPPs on metal films can lead to unique optical phenomena, including pulse reshaping.
    • Understanding these phenomena is crucial for developing advanced optical devices and manipulating light at the nanoscale.

    Purpose of the Study:

    • To theoretically investigate the temporal reshaping of short optical pulses reflected from metal films.
    • To analyze the influence of single- and multiple-boundary surface-plasmon modes on pulse dynamics.
    • To determine the experimental parameter range for observing pulse reshaping effects.

    Main Methods:

    • Theoretical investigation of optical pulse reflection from metal films.
    • Analysis of surface-wave excitation and surface-plasmon modes.
    • Calculation of reflected pulse shapes using Fourier transform integrals.
    • Numerical integration and approximate pole expansion for integral evaluation.
    • Identification of diffraction as a limiting factor.

    Main Results:

    • Demonstrated temporal reshaping of short optical pulses upon reflection.
    • Identified simple exponential time decay for the trailing edge of reflected pulses.
    • Determined the parameter space for experimental observation of pulse reshaping.
    • Highlighted diffraction of the incident beam as a significant limitation.

    Conclusions:

    • The study provides a theoretical framework for understanding optical pulse reshaping via surface-plasmon excitation.
    • The findings offer insights into controlling and predicting pulse dynamics in plasmonic systems.
    • Experimental verification of pulse reshaping is feasible within specific parameter ranges, though diffraction effects must be considered.