Theoretical analysis on shear horizontal polarized surface acoustic waves propagation in periodic metal grating using the variational method

2012 ◽  
Vol 131 (4) ◽  
pp. 3498-3498
Author(s):  
FangQian Xu
Keyword(s):  
Theoretical Analysis ◽  
Variational Method ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Metal Grating ◽  
Waves Propagation ◽  
Polarized Surface ◽  
Shear Horizontal

An Urinary Biosensor for Early Stage Ovarian Cancer Detection: Experimental Characterization

2012 ◽  
Author(s):  
Onursal Onen ◽  
Alper Sisman ◽  
Patricia Kruk ◽  
Rasim O. Guldiken
Keyword(s):  
Ovarian Cancer ◽  
Acoustic Waves ◽  
Early Stage ◽  
Point Of Care ◽  
Surface Acoustic Waves ◽  
Experimental Characterization ◽  
Apoptotic Protein ◽  
Polarized Surface ◽  
Shear Horizontal

In this study, an experimental characterization of a piezoelectric ultrasonic MEMS biosensor for detection of anti-apoptotic protein Bcl-2 in sub ng/ml scale is presented. Bcl-2 is demonstrated to be elevated at different stages of ovarian cancer in urine ranging from 0.5 to 12 ng/ml. Here, shear horizontal (SH) polarized surface acoustic waves (SAWs) were utilized by interdigital transducers (IDTs), which were micro fabricated on piezoelectric ST cut Quartz wafers. SH SAWs were generated and sensed by a pair of IDTs, separated by judiciously designed a delay path in-between with for most effective Bcl-2 capture. The Bcl-2 concentration is characterized with respect to the change in resonance frequency. The target sensitivity for diagnosis and quantifying the stage of ovarian cancer is achieved with successful detection of Bcl-2 levels as low as 0.5 ng/ml. The results are promising for the sensor system to be used in a lab-on-a-chip platform for point of care urinary ovarian cancer monitoring diagnosis.

Existence and spectral properties of shear horizontal surface acoustic waves in vertically periodic half-spaces

2009 ◽  
Vol 465 (2105) ◽  
pp. 1489-1511 ◽  
Author(s):  
A.L. Shuvalov ◽  
O. Poncelet ◽  
S.V. Golkin
Keyword(s):  
Material Properties ◽  
Acoustic Waves ◽  
Spectral Properties ◽  
Surface Acoustic Waves ◽  
Homogeneous Boundary Condition ◽  
Horizontal Surface ◽  
Infinite Strip ◽  
Discrete Variation ◽  
Time Space ◽  
Shear Horizontal

The paper is concerned with the propagation of shear horizontal surface waves (SHSW) in semi-infinite elastic media with vertically periodic continuous and/or discrete variation of material properties. The existence and spectral properties of the SHSW are shown to be intimately related to the shape of the properties variation profile. Generally, the SHSW dispersion branches represent randomly broken spectral intervals on the ( ω ,  k ) plane. They may, however, display a particular regularity in being confined to certain distinct ranges of slowness s = ω / k , which can be predicted and estimated directly from the profile shape. The SHSW spectral regularity is especially prominent when the material properties at the opposite edge points of a period are different. In particular, a unit cell can be arranged so that the SHSW exists within a single slowness window, narrow in the measure of material contrast between the edges, and does not exist elsewhere or vice versa. Explicit analysis in the ( ω ,  k ) domain is complemented and verified through the numerical simulation of the SH wave field in the time–space domain. The results also apply to a longitudinally periodic semi-infinite strip with a homogeneous boundary condition at the faces.

Shear horizontal surface acoustic waves in a magneto-electro-elastic system

2016 ◽  
Vol 25 (1-2) ◽  
pp. 1-13 ◽  
Author(s):  
Shahin Eskandari ◽  
Hossein M. Shodja
Keyword(s):  
Power Series ◽  
Shear Wave ◽  
Half Space ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Acoustic Waves ◽  
Series Solution ◽  
Surface Acoustic Waves ◽  
Power Series Solution ◽  
Shear Horizontal

AbstractPropagation of shear horizontal surface acoustic waves (SHSAWs) within a functionally graded magneto-electro-elastic (FGMEE) half-space was previously presented (Shodja HM, Eskandari S, Eskandari M. J. Eng. Math. 2015, 1–18) In contrast, the current paper considers propagation of SHSAWs in a medium consisting of an FGMEE layer perfectly bonded to a homogeneous MEE substrate. When the FGMEE layer is described by some special inhomogeneity functions – all the MEE properties have the same variation in depth which may or may not be identical to that of the density – we obtain the exact closed-form solution for the MEE fields. Additionally, certain special inhomogeneity functions with monotonically decreasing bulk shear wave velocity in depth are considered, and the associated boundary value problem is solved using power series solution. This problem in the limit as the layer thickness goes to infinity collapses to an FGMEE half-space with decreasing bulk shear wave velocity in depth. It is shown that in such a medium SHSAW does not propagate. Using power series solution we can afford to consider some FGMEE layers of practical importance, where the composition of the MEE obeys a prescribed volume fraction variation. The dispersive behavior of SHSAWs in the presence of such layers is also examined.

scholarly journals Analytical Investigation of Surface Wave Characteristics of Piezoelectromagnetics of Class 6 mm

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Aleksey A. Zakharenko
Keyword(s):  
Surface Wave ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Transversely Isotropic ◽  
Analytical Investigation ◽  
Wave Characteristics ◽  
Surface Wave Propagation ◽  
Theoretical Investigations ◽  
Derivatives Of ◽  
Shear Horizontal

This short work copes with theoretical investigations of some surface wave characteristics for transversely isotropic piezoelectromagnetic composites of class 6 mm. In the composite materials, the surface Bleustein-Gulyaev-Melkumyan wave and some new shear-horizontal surface acoustic waves (SH-SAWs) recently discovered by the author can propagate. The phase velocities of the SH-SAWs can have complicated dependencies on the coefficient of the magnetoelectromechanical coupling (CMEMC) which depends on the electromagnetic constant of the composites. Therefore, the analytical finding of the first and second partial derivatives of the represents the main purpose of this study. It is thought that the results of this short letter can help for theoreticians and experimentalists working in the research arena of opto-acoustoelectronics to completely understand some problems of surface wave propagation in piezoelectromagnetics.

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