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Journal ArticleDOI

Microsound Waveguides and Waveguide Components

01 Oct 1971-IEEE Transactions on Sonics and Ultrasonics (IEEE)-Vol. 18, Iss: 4, pp 219-230

About: This article is published in IEEE Transactions on Sonics and Ultrasonics.The article was published on 1971-10-01. It has received 13 citation(s) till now. The article focuses on the topic(s): Waveguide & Microsound.
Topics: Waveguide (57%), Microsound (51%)
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Journal ArticleDOI
Debopam Datta1, Arash Darbandi1, Shreya Ghosh1, Michael A. Stroscio1  +1 moreInstitutions (1)
Abstract: Acoustic phonon modes in a rectangular nanoscale waveguide deposited on a substrate (Siedel-White type waveguide) are analyzed analytically in terms of the elastic continuum model and the modes are quantized under the dimensional confinement assumption. The rectangular isotropic overlay structure is assumed to be deposited on a substrate with larger area compared to the overlay, and perfectly rigid. The displacement field inside the rectangular overlay structure is described for structures with nanometer dimensions. The frequency dependence of the modes has been studied along with the modal profiles for different overlay dimensions. The phonon occupation number has been evaluated for a range of dimensions and temperatures and the frequency-quality factor (f.Q) product has been theoretically discussed and evaluated using the parameters for silicon.

2 citations

01 Jan 2013

Additional excerpts

  • ...A rectangular overlay waveguide over a rigid substrate has been analyzed in [20][21]....


Journal ArticleDOI
Abstract: A semi-analytical method for finding the elastic modes propagating along the edge of an anisotropic semi-infinite plate is presented. Solutions are constructed as linear combinations of a finite number of the corresponding infinite plate modes with the constraint that they decay in the direction perpendicular to the edge and collectively satisfy the free boundary condition over the edge surface. Such modes that are confined to the edge can be used to approximate solutions of acoustic ridge waveguides whose supporting structures are sufficiently far away from the free edge. The semi-infinite plate or ridge is allowed to be oriented arbitrarily in the anisotropic crystal. Modifications to the theory to find symmetric and antisymmetric solutions for special crystal orientations are also presented. Accuracy of the solutions can be improved by including more plate modes in the series. Numerical techniques to find modal dispersion relations and orientation dependent modal behavior, are discussed. Results for ridges etched in single crystal Silicon are found to be in good agreement with Finite Element simulations. It is found that variations in modal phase velocity with respect to crystal orientation are not significant, suggesting that anisotropy may not be a critical issue while designing ridge waveguides in Silicon.

Additional excerpts

  • ...A rectangular overlay waveguide over a rigid substrate has been analyzed in [3, 4]....


Journal ArticleDOI
Abstract: Ahfruct-The microwave network approach to the solution of guided acoustic wave problems was applied in Paper I to two examples of the class of flat overlay guides: the strip and the slot guides. In this paper, the methods are applied to two different rectangular ridge StNChIeS, the well-known topographic ridge guide and the newer overlay ridge guide. In contrast to the flat overlay guides, for which good analytical results were previously available, no other analytical results have been published for the ridge guides which furnish good accuracy (although excellent numerical methods have been described). In addition, little information is available elsewhere on the pseudo-Rayleigh mode of the ridge guides, which is treated here in detail, and the overlay ridge structure itself is a new one whose properties are not yet appreciated. N THE COMPANION paper [l81 , a microwave network approach was presented for the analysis of waveguides for acoustic surface waves. The philosophy underlying this new approach was discussed, the basic features of the method were presented, and the method was applied to two examples of flat overlay waveguides, the strip and the slot guides. In the present paper, this method is applied to a different class of waveguides: rectangular ridge guides. The rectangular ridge waveguides themselves are of two types: the topographic ridge guide, for which the ridge and the substrate are composed of the same material, and the overlay ridge guide, in which the ridge is comprised of a material different from that of the substrate. The two structures are shown in Figs. l(a) and l(b). Both of these ridge guides are fundamentally different from the strip and slot guides, which appear respectively in Figs. l(a) and l(b) of Paper I. In the latter two guides, thin platings are employed to perturb the Rayleigh mode of the substrate, with the result that almost all of the energy in the waveguide mode resides in the sub

11 citations

Journal ArticleDOI
Abstract: An overview is presented first of the various types of waveguides for acoustic surface waves which have been studied theoretically and experimentally. Many of these waveguides resemble certain waveguiding structures proposed recently for use in integrated and fiber optics. The similarities and differences between corresponding waveguiding structures in the two different fields are then discussed from the standpoints of their properties and their mechanisms of operation.

4 citations

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Journal ArticleDOI
L.R. Adkins1, A.J. Hughes1Institutions (1)
Abstract: To study some of the properties of acoustic waves guided by thin films, experiments on dispersion and transverse tightness of binding were performed in the frequency range 5 MHz to 14 MHz. The movable wedge technique of launching and receiving surface wave signals was utilized. The guidance structure consisted of thin gold films deposited on fused quartz. High resolution experimental results were obtained by modifying the wedges to have a very narrow active region. The data were compared to results predicted by a simplified theoretical model which we have developed. This model is complementary to that of Tiersten in that we match both components of the vector potential while in Tiersten's model one matches a single vector potential component and its normal derivative. Curves calculated by our approach appear to be virtually identical with those of Tiersten for the (width/thickness) ratios treated experimentally, but are much easier to obtain numerically for any particular value of the ratio. For smaller values of the (width/thickness) ratio, our model and that of Tiersten differ slightly. Data for dispersion and mode tightness of binding were found to be in substantial agreement with our theoretical predictions. In addition, the theoretical model predicts features such as location of low-frequency cutoffs and tightness of binding of the antisymmetric modes which have not been completely investigated experimentally.

47 citations

Journal ArticleDOI
Abstract: Surface acoustic wave components have been realized which perform the functions of transduction, amplification, and coupling. Applications are suggested which make use of these components. Exploratory work in connection with surface acoustic waveguides suggests the feasibility of acoustic analogs of conventional microwave transmission line (microsound) components on the surface of crystal and substrates. These microsound transmission lines, hybrids, and directional couplers interconnect microsound transducers, amplifiers, isolators, and phase shifters to form microsound circuits capable of autocorrelation, Fourier transformation, and cross correlation functions. Compatible component configurations are proposed and evaluated which perform these basic functions. The anticipated difficulties with their realization are discussed and the current status of critical problems including the epitaxial growth of thin films and submicron etching procedures will be given. Several circuits capable of performing correlation functions are given.

52 citations

Journal ArticleDOI
E.A. Ash1, R.M. De La Rue1, R.F. Humphryes1Institutions (1)
Abstract: An important requirement for the development of surface wave microsound systems is the ability to guide the energy. The theoretical and experimental progress towards this aim is reviewed. Some preliminary results on topographic guides are presented. Measurement techniques make use of phase-sensitive laser probes to detect the CW surface waves. The technique permits very accurate determination of dispersion characteristics.

69 citations

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