group speed

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group speed

or

group velocity

n
(General Physics) physics the speed at which energy is propagated in a wave. This is the quantity determined when one measures the distance which the radiation travels in a given time. In a medium in which the speed increases with wavelength the group speed is less than the phase speed, and vice versa
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The resulting wave displays a wave packet (or beat) that varies along with the so-called group velocity (v = [v.
Perhaps by listening to the crashing of the water, he developed an idea for translating an oceanographic concept about the group velocity of waves into an atmospheric concept.
In this paper, optical fiber is designed with tapered core and a metamaterial cladding, which could be used reduce the group velocity of the fiber to the greater extend when compared to the fiber with no tapering fiber.
The Rayleigh-wave group velocity for the trace of each event registered has been measured by means of the combination of digital filtering techniques: Multiple Filter Technique (Dziewonski et al.
The results focused on waveforms, fast Fourier transforms (FFT), and frequency/time analysis (with superimposed group velocity curves) of the signals.
such a tool must have, in addition, a second pulsed laser beam at high average power and fixed wavelength greater than 1 000 nm and a module for the dispersion compensation of the group velocity.
Six topics of interest are chosen: narrow band gap semiconductors, including structural properties, crystal growth, optical and electrical properties, and applications; analysis of metamaterial systems and hyperinterfaces with a group velocity model, including the investigation of such phenomena as optical cloaking; light propagation at metal surfaces; photo-induced spin in materials with varying magnetic properties; the photoelectric effect in perovskite oxide heterostructures; and magnetic resonance effects in large metamolecules.
Washington, August 14 ( ANI ): Researchers from France and China have managed to throttle the group velocity of light back to less than one billionth of its top speed.
5] have shown that the group velocity of the asymmetric surface plasmons mode can be negative by engineering the dispersion curve.
ALL signs point to Mexico for pothole-fixing group Velocity after the firm sealed a five-year deal worth PS7.
In previous articles [1], [2] the method for measurement of the group velocity of guided waves based on the application of the spectrum decomposition technique was presented.