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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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American Journal of Physics, 2000 The group velocity for pulses in an optical medium can be negative at frequencies between those of a pair of laser-pumped spectral lines. The gain medium then can amplify the leading edge of a pulse resulting in a time advance of the pulse when it exits ...
Hamilton W. R., Kirk T. McDonald
core +6 more sources
Slow group velocity and Cherenkov radiation [PDF]
Physical Review Letters, 2001 We theoretically study the effect of ultraslow group velocities on the emission of Vavilov-Cherenkov radiation in a coherently driven medium. We show that in this case the aperture of the group cone on which the intensity of the radiation peaks is much ...
C. Liu +24 more
core +8 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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Group velocity in noncommutative spacetime [PDF]
Journal of Cosmology and Astroparticle Physics, 2002 The realization that forthcoming experimental studies, such as the ones planned for the GLAST space telescope, will be sensitive to Planck-scale deviations from Lorentz symmetry has increased interest in noncommutative spacetimes in which this type of ...
Amelino-Camelia, Giovanni +2 more
core +4 more sources
Microscopic theory of polariton group velocity renormalization [PDF]
Nature CommunicationsCavity exciton-polaritons exhibit ballistic transport and can achieve 100 μm in one picosecond. This ballistic transport significantly enhances mobility compared to that of bare excitons, which often move diffusively and become the bottleneck for energy ...
Wenxiang Ying +3 more
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New Surface-Plasmon-Polariton-Like Acoustic Surface Waves at the Interface Between Two Semi-Infinite Media [PDF]
Archives of Acoustics, 2022 This paper presents theory of new shear horizontal (SH) acoustic surface waves that propagate along the interface of two semi-infinite elastic half-spaces, one of which is a conventional elastic medium and a second one an elastic metamaterial with a ...
Piotr Kiełczyński
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JGEET: Journal of Geoscience, Engineering, Environment and Technology, 2023 Hululais area lies in the pull-apart basins of the Ketaun Segment and Musi Segment fault as a part of the Sumatra Fault Zone (SFZ). The boundary normal faults of pull-apart basins play an important role as major discharge zones for geothermal fluid ...
Tavip Dwikorianto +3 more
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Advanced Electronic Materials, 2023 Improvement of transmission efficiency of spin waves in magnonic devices is crucial for high‐efficiency magnon‐based operations. However, existing techniques for enhancing spin‐wave detection signals, which either improve waveguide material quality or ...
Jiapeng Xu +9 more
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