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  • 1
    Electronic Resource
    Electronic Resource
    Beam propagation algorithms for frequency response of surface acoustic wave directional couplers (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 6614-6618 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Surface acoustic wave directional couplers have long been known in both microwave and integrated acoustic applications. Such couplers are ideal for integration in acoustical signal processing devices, such as modulators or switches. There are, however, very few publications concerning the frequency response of these devices. This article represents both experimental and theoretical studies on the frequency response of directional couplers, with and without a thin strip deposited in the gap between the main channels. The beam propagation method, used in integrated optics, was adapted for acoustical directional couplers. It enabled the analysis and prediction of the frequency response of these types of couplers. Calculations were performed for the channels and interdigital transducers in the frequency range of 50–90 MHz. By using proper dimensions of the couplers' parameters, coupling efficiency for the higher part of the frequencies, in the receiver channel, was increased. This increase enables the selection of receiver frequencies and, therefore, a frequency channelizer could be developed. A thin strip between the main channels increases the coupling efficiency between the two channels and thereby reduces by about 30% the length of the coupler required for different frequency selections or conventional switches. This reduction makes it possible to obtain more compact devices with reduced losses. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363784
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  • 2
    Electronic Resource
    Electronic Resource
    Distributed feedback guided surface acoustic wave microresonator (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 1428-1434 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Surface acoustic wave resonators have been used in a number of applications: high-Q frequency filtering, very accurate frequency sources, etc. A major disadvantage of conventional resonators is their large dimensions, which makes them inadequate for integrated acoustics applications. In order to overcome these size limitations a new type of microresonator was designed, developed, and tested. In this paper, theoretical calculations and measurements on two kinds of such devices (a corrugated waveguide filter and a microresonator structure) are presented and their possible applications are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344447
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  • 3
    Electronic Resource
    Electronic Resource
    Physical properties of SnOx films (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 102-104 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: SnOx films with different values of x were deposited by rf sputtering. Secondary emission yield δ, physical density γ, and electrical resistivity ρ of the films were investigated. Higher values of δ than those of bulk SnO and SnO2 were found. From the experiment it results that δ, γ, and ρ increase with the increase of x. The crossover energy Ec, the primary electron energy for δ=1, decreases with x. Analysis of the experimental data and theory leads to the conclusion that the main factor which determines the maximum secondary electron emission yield δm is the ratio between the escape probability and the work function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335503
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  • 4
    Electronic Resource
    Electronic Resource
    Novel types of surface acoustic wave microreflectors: Performance analysis and simulations (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 6675-6681 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Surface acoustic waves for micrograting reflectors have been characterized. Based on the perturbation theory, eight different types of structures on an acoustic waveguide were analyzed. Results of simulations of all eight types of corrugation structures were evaluated in order to find the least leaky waveguide, the most efficient reflector (with minimum necessary perturbations), and the optimal mode shape for improved performances. General design curves are presented in order to illustrate the behavior of the incident and reflected waves under a variety of structural conditions. Analytic expressions for the calculations of the mode amplitude and mode shape, and for general acoustic corrugations are derived and then the simulations results are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345103
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  • 5
    Electronic Resource
    Electronic Resource
    High transfer-efficiency microsurface acoustic wave directional couplers (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 5561-5564 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Surface acoustic waves (SAWS) directional couplers have long been known in both microwave and integrated acoustic applications. Such couplers, when both channels are of different widths and different dispersion characteristics, may also be used as electronic filters. SAW directional couplers are ideal for inclusion in acoustical signal processing devices, as modulators or switches. This article represents formulation and physical properties of advanced high transfer efficiency SAW directional couplers, using the coupled mode theory. One kind of directional coupler is especially considered and discussed in detail. The obtained coupling parameters are applicable to any guided modes in parallel waveguides of the same cross section, similar to 1/v index of refractive and identical shapes. Coupling constants and physical parameters for the coupled acoustic modes, computed according to this theory, are shown and seem to agree very well with experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351954
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of radiation induced defects on the capacitance of silicon detectors (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 1517-1521 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of neutron induced defects on Si detectors was studied both experimentally and theoretically. These defects form deep energy levels within the band gap. Four such levels were detected: 0.17, 0.24, 0.4, and 0.46 eV, using DLTS (deep level transient spectroscopy). The corresponding defects were identified and characterized. The capacitance was measured at different frequencies and temperature. It was shown that the capacitance of the irradiated detectors strongly depends upon temperature. A relation for this dependence (C-T) was found. Comparisons of DLTS with C-T results showed good agreement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351221
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Grating-assisted surface acoustic wave directional couplers (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 46-52 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Physical properties of novel grating-assisted Y directional couplers are examined using the coupled-mode theory. A general formalism for the analysis of the lateral perturbed directional coupler properties is presented. Explicit expressions for waveguide key parameters such as coupling length, grating period, and other structural characterizations, are obtained. The influence of other physical properties such as time and frequency response or cutoff conditions are also analyzed. A plane grating-assisted directional coupler is presented and examined as a basic component in the integrated acoustic technology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350251
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  • 8
    Electronic Resource
    Electronic Resource
    The effect of radiation on ion-implanted silicon detectors
    Amsterdam : Elsevier
    Nuclear Instruments and Methods in Physics Research Section A: 243 (1986), S. 93-97 
    Details
    ISSN: 0168-9002
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0168-9002(86)90826-0
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  • 9
    Electronic Resource
    Electronic Resource
    Silicon detectors in calorimetry
    Amsterdam : Elsevier
    Nuclear Instruments and Methods in Physics Research Section A: 226 (1984), S. 369-372 
    Details
    ISSN: 0168-9002
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0168-9002(84)90051-2
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  • 10
    Electronic Resource
    Electronic Resource
    Silicon sampling calorimetry
    Amsterdam : Elsevier
    Nuclear Instruments and Methods in Physics Research Section A: 265 (1988), S. 266-272 
    Details
    ISSN: 0168-9002
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0168-9002(88)91080-7
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