Wave fronts of nonlinear waves in a vibrationally relaxing gas

1978 ◽  
Vol 21 (8) ◽  
pp. 1265 ◽  
Author(s):  
Ryuji Ishii
Keyword(s):  
Nonlinear Waves ◽  
Wave Fronts ◽  
Relaxing Gas

Propagation of modulated nonlinear waves in a relaxing gas-liquid mixture

1980 ◽  
Vol 15 (1) ◽  
pp. 108-116
Author(s):  
A. G. Bagdoev ◽  
G. G. Oganyan
Keyword(s):  
Nonlinear Waves ◽  
Liquid Mixture ◽  
Relaxing Gas

Nonlinear Breaking of Wave Fronts in a Vibrationally Relaxing Gas

1982 ◽  
Vol 49 (1) ◽  
pp. 10-12
Author(s):  
R. Shyam ◽  
V. D. Sharma ◽  
V. V. Menon
Keyword(s):  
Wave Front ◽  
Vibrational Relaxation ◽  
Method Of Characteristics ◽  
Spherically Symmetric ◽  
Wave Fronts ◽  
Compressive Wave ◽  
Initial Discontinuity ◽  
Explicit Criteria ◽  
Front Curvature ◽  
Relaxing Gas

Using the method of characteristics, some explicit criteria for the nonlinear breaking of wave fronts in a plane, cylindrically or spherically symmetric flows of a vibrationally relaxing gas are obtained. It is shown that except a spherically converging compressive wave, all compressive waves break only when the initial discontinuity at the wave-head exceeds a critical value, and the effects of vibrational relaxation and that of the wave front curvature are to increase the time of their breaking. It is found that the stabilizing influences of vibrational relaxation and that of the wave front curvature are not strong enough to overcome the breaking tendency of a spherically converging compressive wave; in fact, in contrast to a cylindrically converging wave, it always breaks down before the formation of a focus, no matter how small be the initial discontinuity at the wave-head.

Nonlinear Waves, Solitons and Chaos

2000 ◽  
Author(s):  
Eryk Infeld ◽  
George Rowlands
Keyword(s):  
Nonlinear Waves

scholarly journals Controlling wave fronts with tunable disordered non-Hermitian multilayers

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Denis V. Novitsky ◽  
Dmitry Lyakhov ◽  
Dominik Michels ◽  
Dmitrii Redka ◽  
Alexander A. Pavlov ◽  
...  
Keyword(s):  
Incident Light ◽  
Passage Time ◽  
Photonic Devices ◽  
Gain Saturation ◽  
Wave Fronts ◽  
Optical Effects ◽  
Front Shape ◽  
Optical Applications ◽  
Increasing Demand ◽  
First Time

AbstractUnique and flexible properties of non-Hermitian photonic systems attract ever-increasing attention via delivering a whole bunch of novel optical effects and allowing for efficient tuning light-matter interactions on nano- and microscales. Together with an increasing demand for the fast and spatially compact methods of light governing, this peculiar approach paves a broad avenue to novel optical applications. Here, unifying the approaches of disordered metamaterials and non-Hermitian photonics, we propose a conceptually new and simple architecture driven by disordered loss-gain multilayers and, therefore, providing a powerful tool to control both the passage time and the wave-front shape of incident light with different switching times. For the first time we show the possibility to switch on and off kink formation by changing the level of disorder in the case of adiabatically raising wave fronts. At the same time, we deliver flexible tuning of the output intensity by using the nonlinear effect of loss and gain saturation. Since the disorder strength in our system can be conveniently controlled with the power of the external pump, our approach can be considered as a basis for different active photonic devices.

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