Results 1 to 10 of about 16,466,590 (349)
Imaging gigahertz zero-group-velocity Lamb waves [PDF]
Nature Communications, 2019 Zero-group-velocity Lamb waves, which are surface waves with reduced losses and high Q factor, have many potential applications. The authors image such waves in 2 dimensions, and in the GHz range, with a bilayer using a time-resolved imaging technique ...
Qingnan Xie +7 more
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Does group velocity always reflect elastic modulus in shear wave elastography? [PDF]
J Biomed Opt, 2019 . Dynamic elastography is an attractive method to evaluate tissue biomechanical properties. Recently, it was extended from US- and MR-based modalities to optical ones, such as optical coherence tomography for three-dimensional (3-D) imaging of ...
Pelivanov I +8 more
europepmc +2 more sources
Group-velocity-locked vector soliton molecules in fiber lasers. [PDF]
Sci Rep, 2017 Physics phenomena of multi-soliton complexes have enriched the life of dissipative solitons in fiber lasers. By developing a birefringence-enhanced fiber laser, we report the first experimental observation of group-velocity-locked vector soliton (GVLVS ...
Luo Y +8 more
europepmc +2 more sources
High-speed electro-optic modulator with group velocity matching on silicon substrate [PDF]
Frontiers in Bioengineering and BiotechnologyElectro-optic modulators with low driving voltage and wide bandwidth are critical for advanced analog and digital communication systems. To achieve high-speed thin-film lithium niobate (TFLN) electro-optic modulators on silicon substrates, this work ...
Yingbo Liu +9 more
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Investigating group-velocity-tunable propagation-invariant optical wave-packets [PDF]
Scientific Reports, 2022 The group-velocity of the propagation-invariant optical wave-packet generated by the conical superposition can be controlled by introducing well-designed arbitrarily-axisymmetric pulse-front deformation, which permits realizing superluminal, subluminal ...
Zhaoyang Li +3 more
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Negative group velocity in the absence of absorption resonance. [PDF]
Sci Rep, 2013 Scientific community has well recognized that a Lorentzian medium exhibits anomalous dispersion behavior in its resonance absorption region. To satisfy the Krammers-Kronig relation, such an anomalous region has to be accompanied with significant loss and
Ye D +6 more
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ON THE GROUP VELOCITY OF WHISTLING ATMOSPHERICS
Solar-Terrestrial Physics, 2021 The dynamic spectrum of a whistling atmospheric is a signal of falling tone, and the group delay time of the signal as a function of frequency is formed as a result of propagation of a broadband pulse in a medium (magnetospheric plasma) with a quadratic ...
A.V. Guglielmi, B.I. Klain, A.S. Potapov
doaj +4 more sources
Rogue events in the group velocity horizon. [PDF]
Sci Rep, 2012 The concept of rogue waves arises from a mysterious and potentially calamitous phenomenon of oceanic surfaces. There is mounting evidence that they are actually commonplace in a variety of different physical settings.
Demircan A +5 more
europepmc +2 more sources
Supercontinuum generation by multiple scatterings at a group velocity horizon. [PDF]
Optics Express, 2014 A new scheme for supercontinuum generation covering more than one octave and exhibiting extraordinary high coherence properties has recently been proposed [Phys. Rev. Lett. 110, 233901 (2013)].
A. Demircan +4 more
semanticscholar +2 more sources