Acoustic Surface Waveguides and Comparisons with Optical Waveguides
01 Dec 1976-IEEE Transactions on Microwave Theory and Techniques (IEEE)-Vol. 24, Iss: 12, pp 914-920
TL;DR: An overview of the various types of waveguides for acoustic surface waves which have been studied theoretically and experimentally can be found in this article, where the similarities and differences between corresponding waveguiding structures in the two different fields are discussed from the standpoints of their properties and their mechanisms of operation.
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.
Citations
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Patent•
21 Feb 2007TL;DR: In this paper, the authors proposed a method for designing a waveguide profile based upon predicted performance measurements of the waveguide, such as the change in acoustic reactance along the transition of waveguide.
Abstract: This invention provides a method for designing a waveguide profile based upon predicted performance measurements of the waveguide. The method involves establishing a design metric, such as the change in acoustic reactance along the transition of the waveguide. Initial values may then assigned for the radius or diameter of the throat of the waveguide as well as values for the initial slope of the waveguide along the major and minor (or x and y) axis and the depth of the waveguide. The waveguide may then be divided into two or more sections. The values of the slopes for each section are then altered based upon the design metric. When using the change of acoustic reactance as the design metric, the slope of each section of the waveguide is adjusted to minimize the change in acoustic reactance between the sections, which is the desired performance standard. Once the slopes of each section are adjusted to achieve minimal change in acoustic reactance, the sections are concatenated together and the curve is smoothed using a polynomial function order curve fit to create a waveguide profile. This profile correlates with the design measurements, which allows for the prediction of the performance standards and/or dispersion characteristics of the waveguide. This allows for design iterations to be made to the waveguide to adjust for performance measurements without building a prototype.
12 citations
01 Oct 1976
TL;DR: Theoretical analyses and performance results are presented for two waveguides for integrated optics which are formed by metal platings, employing structures similar to those in some modulators or switches as mentioned in this paper.
Abstract: Theoretical analyses and performance results are presented for two waveguides for integrated optics which are formed by metal platings, employing structures similar to those in some modulators or switches. One structure is a slot waveguide, formed by a slot or gap of unplated film on a substrate between two plated regions, for which previous analyses are incorrect for one polarization. The correct analysis shows that for that polarization the modes are leaky and that propagation occurs over a wider frequency range than expected. The other structure is a new one consisting simply of a strip of metal plated on a film on a substrate. Waveguiding with low loss is possible under appropriate conditions because metals at optical frequencies behave as overdense plasmas.
5 citations
TL;DR: In this article, the modal characteristic equations of a curvilinear triangular cored optical waveguide are obtained in three cases using Goell's point matching method under weak guidance condition.
Abstract: Using Goell's point matching method under weak guidance condition, the modal characteristic equations of a curvilinear triangular cored optical waveguide are obtained in three cases. In one case the proposed waveguide has on its one side a conducting material and other two sides are bounded by dielectric material. We describe it as dielectric-dielectric-metal (DDM) waveguide. In other case we consider both the boundaries conducting. We call this as metal-metal-dielectric (MMD) waveguide. Finally, we consider all the boundaries conducting. We call this as a metal-metal-metal (MMM) waveguide. Results obtained in all three cases are compared. It is found that for a given V-value the DDM waveguide will support more modes than MMD and MMM waveguides. Therefore, the MMD or MMM waveguides may be used as a mode filter. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2709–2713, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22854
4 citations
TL;DR: In this article, a light guide with a curvilinear triangular core cross-section is proposed and the modal characteristics equations for the lowest order mode have been derived using Goell's point matching method under weak guidance approximation.
4 citations
References
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TL;DR: In this article, some new dielectric waveguide structures suitable for millimeter-wave and optical integrated circuits are presented and a method of analyzing wave propagation in these guides is developed by assuming simple field distribution and approximating the various regions of the guides in terms of effective dielectrics constants.
Abstract: Some new dielectric waveguide structures suitable for millimeter-wave and optical integrated circuits are presented. A method of analyzing wave propagation in these guides is developed by assuming simple field distribution and approximating the various regions of the guides in terms of effective dielectric constants. The mathematical formulation utilized results in simple eigenvalue equations from which the dispersion characteristics of the waveguides are readily obtained. Experimental results are described and the agreement between theory and experiment is shown to be quite good.
191 citations
TL;DR: The slab-coupled waveguide is a multidielectric waveguide that includes such special cases as the single-material fiber, the rib waveguide, and the strip-loaded film guide as mentioned in this paper.
Abstract: The slab-coupled waveguide, consisting of a dielectric rod lying on a slab that in turn covers a substrate, is a multidielectric waveguide that includes such special cases as the single-material fiber, the rib waveguide, and the strip-loaded film guide. These guides have recently become known as potentially useful either for long-distance optical transmission or for integrated optics. Simple, closed-form, approximate solutions have been found to describe the following properties of the guide: number of modes, their field configurations and propagation constants, numerical aperture, requirements for single-mode operation, field penetration in the slab, tolerance to curvature of the guide axis, dispersion, and impulse response.
184 citations
TL;DR: In this paper, a low-loss strip-loaded guides, consisting of 7059 glass film on fused quartz substrate with sputtered SiO 2 as the loading strip, have been investigated.
Abstract: Low-loss strip-loaded guides, consisting of 7059 glass film on fused quartz substrate with sputtered SiO 2 as the loading strip, have been investigated. The number of modes supported by the strip-loaded structures were determined experimentally and compared with the values predicted by the application of an equivalent index analysis. Agreement between theory and experiment is good in the case of the smaller number of modes which result from small loading, with the 7059 film thickness far away from cutoff.
151 citations
TL;DR: In this article, the authors report the fabrication and testing of a GaAs electro-optic directional-coupler (EDC) switch in which the fraction of light coupled from one waveguide channel to the other can be controlled by an applied electric field.
Abstract: We report the fabrication and testing of a GaAs electro‐optic directional‐coupler (EDC) switch in which the fraction of light coupled from one waveguide channel to the other can be controlled by an applied electric field Ninety‐five percent amplitude switching and a maximum extinction ratio of 13 dB have been observed in an EDC switch, having a minimum 3‐dB bandwidth of ≳100 MHz and a drive power per unit bandwidth of <180 μW/MHz
149 citations
TL;DR: A novel dielectric optical waveguide was made consisting of a guide pattern on a thin dielectrics film where almost all the power propagates in the thin film along the guide pattern.
Abstract: A novel dielectric optical waveguide was made consisting of a guide pattern on a thin dielectric film. Almost all the power propagates in the thin film along the guide pattern. The existence of propagation modes of this waveguide was verified both theoretically and experimentally.
138 citations