scholarly journals Reflection and transmission of light in multilayers perturbed by picosecond strain pulse propagation

2002 ◽  
Vol 19 (12) ◽  
pp. 3028 ◽  
Author(s):  
O. Matsuda ◽  
O. B. Wright
Keyword(s):  
Pulse Propagation ◽  
Reflection And Transmission ◽  
Strain Pulse

Strain pulse propagation in composite elastic rods

Composites ◽  
1970 ◽  
Vol 1 (3) ◽  
pp. 190
Author(s):  
V.K Varatharajulu ◽  
I Kayek Sabih
Keyword(s):  
Pulse Propagation ◽  
Elastic Rods ◽  
Strain Pulse

Strain pulse propagation in composite elastic rods

1969 ◽  
Vol 2 (1) ◽  
pp. 9-28
Author(s):  
V.K. Varatharajulu ◽  
Sabih I. Hayek
Keyword(s):  
Pulse Propagation ◽  
Elastic Rods ◽  
Strain Pulse

Pulse Propagation in Fluid-Filled Elastic Curved Tubes

1981 ◽  
Vol 103 (1) ◽  
pp. 43-49 ◽  
Author(s):  
C. K. Hu ◽  
J. W. Phillips
Keyword(s):  
Method Of Characteristics ◽  
Pulse Propagation ◽  
Elastic Tube ◽  
Governing Equations ◽  
Reflection And Transmission ◽  
Transmission Coefficients ◽  
The Method Of Characteristics ◽  
Continuous Waves ◽  
Fluid Transients ◽  
Inviscid Compressible Fluid

The propagation of fluid transients through elbows is studied. A set of one-dimensional governing equations for the propagation of pressure pulses in an inviscid compressible fluid contained in a thin-walled naturally curved elastic tube is formulated and solved by two different techniques. For continuous waves, reflection and transmission coefficients for elbows are determined numerically by considering periodic waves in an assemblage of straight and curved tubes. For pulse propagation, the method of characteristics is employed to solve the assemblage problem. An experimental arrangement for pulse studies is described and experimental results are compared with numerical results from the method of characteristics.

Long wavelength superluminal pulse propagation in a defect slab doped with GaAs/AlGaAs multiple quantum well nanostructure

2015 ◽  
Vol 29 (33) ◽  
pp. 1550216 ◽  
Author(s):  
M. Panahi ◽  
G. Solookinejad ◽  
E. Ahmadi Sangachin ◽  
S. H. Asadpour
Keyword(s):  
Quantum Wells ◽  
Pulse Propagation ◽  
Light Transmission ◽  
Multiple Quantum Well ◽  
Multiple Quantum ◽  
Reflection And Transmission ◽  
Long Wavelength ◽  
Transmission Coefficients ◽  
Nonresonance Condition ◽  
Excitonic States

In this paper, long wavelength superluminal and subluminal properties of pulse propagation in a defect slab medium doped with four-level GaAs/AlGaAs multiple quantum wells (MQWs) with 15 periods of 17.5 nm GaAs wells and 15 nm [Formula: see text] barriers is theoretically discussed. It is shown that exciton spin relaxation (ESR) between excitonic states in MQWs can be used for controlling the superluminal and subluminal light transmissions and reflections at different wavelengths. We also show that reflection and transmission coefficients depend on the thickness of the slab for the resonance and nonresonance conditions. Moreover, we found that the ESR for nonresonance condition lead to superluminal light transmission and subluminal light reflection.

scholarly journals Longitudinal Strain Pulse Propagation in Wide Rectangular Bars: Part 1—Theoretical Considerations

1963 ◽  
Vol 30 (1) ◽  
pp. 51-60 ◽  
Author(s):  
O. E. Jones ◽  
A. T. Ellis
Keyword(s):  
Elastic Strain ◽  
Longitudinal Strain ◽  
Pulse Propagation ◽  
Equations Of Motion ◽  
Step Function ◽  
Infinite Strip ◽  
Asymptotic Expressions ◽  
Theoretical Considerations ◽  
Strain Pulse ◽  
Function Time

The propagation of a longitudinal elastic strain pulse in a wide rectangular bar is considered on the basis of approximate plane-stress equations of motion. Asymptotic expressions are obtained which, for large distances of travel, describe the pulse propagation in a semi-infinite strip with stress-free lateral edges, subject to the conditions that a uniform normal stress with a step-function time dependence is applied to the end and that the end is laterally constrained. Particular emphasis is given to describing the warping of plane sections during passage of the strain pulse.

scholarly journals Longitudinal Strain Pulse Propagation in Wide Rectangular Bars: Part 2—Experimental Observations and Comparisons With Theory

1963 ◽  
Vol 30 (1) ◽  
pp. 61-69 ◽  
Author(s):  
O. E. Jones ◽  
A. T. Ellis
Keyword(s):  
Plane Stress ◽  
Pulse Propagation ◽  
Step Function ◽  
Pressure Loading ◽  
Stress Theory ◽  
Second Mode ◽  
Fringe Patterns ◽  
Strain Pulse ◽  
Thickness Mode ◽  
Theory And Experiment

The plane-stress theory presented in Part 1 is shown to predict qualitatively the warping of plane sections observed in transient fringe patterns obtained using birefringent coatings and in dynamic photoelastic pictures obtained in other investigations. Measurements using conventional techniques are described in which wide rectangular bars were subjected to a longitudinal step-function pressure loading produced by a shock tube. Comparisons show that the gross features of the experimental records for the head of the pulse are qualitatively predicted by the theory. Both theory and experiment show that short-wavelength, second-mode disturbances arrive very early. Experimentally it is observed that these disturbances are accomplished by thickness-mode activity which cannot be accounted for by the plane-stress theory.

Parabolas from Reconstructed Surfaces Observed in Convergent-Beam RHEED Patterns

1990 ◽  
Vol 48 (2) ◽  
pp. 398-399
Author(s):  
M. Gajdardziska-Josifovska
Keyword(s):  
Electron Microscopy ◽  
High Energy ◽  
Two Dimensional ◽  
High Energy Electron ◽  
Reflection And Transmission ◽  
Experimental Diffraction Pattern ◽  
Surface Resonance ◽  
Reconstructed Surfaces ◽  
Reflection Electron Microscopy ◽  
Convergent Beam

Parabolas have been observed in the reflection high-energy electron diffraction (RHEED) patterns from surfaces of single crystals since the early thirties. In the last decade there has been a revival of attempts to elucidate the origin of these surface parabolas. The renewed interest stems from the need to understand the connection between the parabolas and the surface resonance (channeling) condition, the latter being routinely used to obtain higher intensity in reflection electron microscopy (REM) images of surfaces. Several rather diverging descriptions have been proposed to explain the parabolas in the reflection and transmission Kikuchi patterns. Recently we have developed an unifying general treatment in which the parabolas are shown to be K-lines of two-dimensional lattices. Here we want to review the main features of this description and present an experimental diffraction pattern from a 30° MgO (111) surface which displays parabolas that can be attributed to the surface reconstruction.

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