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  • 1
    Electronic Resource
    Electronic Resource
    Quasioptics of second-order Bragg interaction in a thin film optical waveguide (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6741-6749 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: For the transverse magnetic mode, the second-order Bragg interaction of the guided and the radiated waves is considered for a thin film dielectric waveguide with a corrugated film–cover interface. A set of four canonical equations for the deexcitation and the excitation of the guided waves are derived by employing a quasioptical technique. The governing equations are applied for the treatment of a surface-emitting distributed feedback laser. Some design criteria are obtained for optimizing the performance of the laser. When these design criteria are used, the laser characteristics are insensitive to small changes in the physical parameters about their designed values. Numerical results are presented to illustrate the performance of the laser. The shape of the surface relief grating is found to play a vital role in determining the gain threshold and the gain margin of the laser. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361495
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  • 2
    Electronic Resource
    Electronic Resource
    Thin dielectric waveguide with a phased array of two gratings on its surfaces (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 4851-4872 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The deexcitation and the excitation of the transverse electric (perpendicular polarization) and the transverse magnetic (parallel polarization) guided modes in a thin-film planar dielectric waveguide sandwiched between a cover and a substrate (two different dielectrics) are considered. There are two gratings, one on each surface of the film, with the same grating wave number but with different relative amplitudes and phases. The three governing equations are derived by a quasioptical technique, and the reciprocal property and the power conservation requirements are examined. An output coupler with no radiative leakage in the substrate and a practical input coupler with the incident beam in the cover only and with a high input coupling efficiency are designed with a suitable choice of the grating depth ratio and the lateral phase shift. An output coupler can be achieved with no radiative leakage either in the substrate or in the cover by an appropriate choice of film thickness and the grating parameters. This configuration of the output coupler is used in the development of a grating polarizer with the output either in the perpendicular or in the parallel polarization. Selected numerical results are presented to illustrate the important characteristics of the output and the input couplers and the polarizers as well as the sensitivities of the performance of these devices to small changes of the physical parameters about their designed values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355771
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of phase shifter on the characteristics of the distributed feedback laser (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 5244-5252 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: For both transverse magnetic and transverse electric modes, the governing equations for the guided-guided wave interaction in a dielectric thin film waveguide which is etched with a cosinusoidal surface corrugation have been developed by using a quasioptical technique. These governing equations are used to investigate the effect of the phase shifter on the characteristics of the distributed feedback laser. Phase shifters either at the center or at the ends of the laser eliminate the gain degeneracy and make the power distribution inside the laser more uniform. When the amount of phase shift is appropriately chosen, the gain margin increases and reaches a maximum value. The roles of the other parameters in achieving a single-mode operation for the laser have been investigated by means of numerical examples. It has been found that the characteristics of the distributed feedback laser with phase shifters are quite similar for both transverse magnetic and transverse electric modes. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359700
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  • 4
    Electronic Resource
    Electronic Resource
    Applications of the second-order Bragg interaction in a thin-film optical waveguide for the transverse electric mode (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 4859-4866 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The operation of output coupler, input coupler, surface emitting amplifier, and surface emitting distributed feedback laser formed on a thin-film dielectric waveguide depends on guided–guided and guided–radiated wave couplings. The characteristics of these devices are treated for the transverse electric mode for wave interactions caused by a suitable relief grating formed on the film–cover interface. Design criteria are deduced and optimization procedures are indicated with illustrative numerical examples. The device characteristics are insensitive to small changes in the physical parameters. Surface emitting amplifier with a uniform near-field pattern and surface emitting distributed feedback laser operating in a single mode are investigated. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363528
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  • 5
    Electronic Resource
    Electronic Resource
    Guided-mode interactions in thin films with surface corrugation (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 7583-7600 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The guided modes in a thin-film planar dielectric waveguide sandwiched between a cover and a substrate (two different dielectrics) are considered. The interface between the cover and the film has a smooth corrugation in the longitudinal direction. For weak corrugations, the guided-mode interactions are investigated using the expansion in terms of ideal normal modes. A corresponding treatment is given for the not-so-weak corrugations using the expansion in terms of local normal modes. The coupling coefficients are evaluated and reduced to simple forms. The theories are specialized for the treatment of contradirectional coupling between two guided modes taking place selectively in the neighborhood of the Bragg frequency. The coupled-mode equations governing the contradirectional interaction obtained from the local normal mode expansion procedure, in the limit of weak periodic corrugations, are identical to those deduced directly using the ideal normal mode expansion technique. The treatments for both the transverse electric and the transverse magnetic modes are included. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357951
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  • 6
    Electronic Resource
    Electronic Resource
    Excitation of long-range surface polaritons in silver films by a finite-width light beam (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 555-557 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The evanescent wave excitation of a long-range surface polariton in a silver film is treated including the effects of the finite width of the incident laser beam and the slow spatial variation of the amplitude of the surface polariton. The theoretical results of the antiresonance characteristics in the angular response of the reflectivity are compared with the available experimental observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345246
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  • 7
    Electronic Resource
    Electronic Resource
    Diffraction and bremsstrahlung radiation from a loop charge in a cylindrical pipe with a step change in wall radius (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 23-36 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A theory is developed to model diffraction and bremsstrahlung radiation in the transverse magnetic mode from a loop of charge in a cylindrical pipe with a discontinuous change in wall radius. The beam kinetics is assumed a priori. A consistent definition of the longitudinal coupling resistance is developed. Scattering effects peak at the cutoff frequencies of the modes of the larger pipe. When kinetic losses are sufficiently large, a change in loop charge radius may alter the propagation of the dominant mode when the charge moves from a larger to smaller diameter pipe. This effect is not present if the charge motion is in the reverse direction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343863
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  • 8
    Electronic Resource
    Electronic Resource
    Coupling of guided modes in thin films with surface corrugation (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 115 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Two guided modes in a grounded, thin, dielectric film waveguide having a periodic corrugation of the interface between the film and the cover can interact selectively in the neighborhood of a particular frequency. Five different theories exist for the investigation of this interaction. The first three are small amplitude theories which assume that the amplitude of the corrugation relative to the thickness of the film is small and the third and the fourth theories are large amplitude theories which do not make such an assumption. In the small amplitude theories, solutions are sought as a perturbation of ideal normal modes and boundary conditions are applied on the average flat surface. The first small amplitude theory makes use of quasioptical considerations and the other two small amplitude theories employ wave-theoretical techniques. All three theories lead to identical coupled mode equations governing the interaction. The first large amplitude theory is based on an expansion in terms of local normal modes and is applicable for a grating with a smooth profile. The second large amplitude theory is applicable for a lamellar grating and it makes use of a model of a repetitively mismatched transmission line. The various intrinsic dephasing mechanisms are explained. The large amplitude theories are able to account for the dephasing effects due to the finite (nonvanishing) depth and the finite (noninfinite) length of the corrugations. Some aspects of passive devices and some theoretical considerations of active devices using corrugated waveguides are reviewed. The transmission line model is able to take into account the end effects. For the mode of operation considered, there are no end effects and the overall contribution of the vertical discontinuities vanish for the lamellar grating.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340381
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  • 9
    Electronic Resource
    Electronic Resource
    Leaky surface polariton (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 1187-1195 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The characteristics of a leaky surface polariton existing on the surface of a free electron metal having the profile of an ordinary diffraction grating are investigated including the effects of the finite length of the grating and the slow spatial variation of the amplitude of the surface polariton. The radiative decay characteristics of the surface polariton and the characteristics of the antiresonance in the angular response of the reflectivity of light incident on the grating are discussed, and the effect of a small dissipation in the metal on these characteristics is also included.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336556
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  • 10
    Electronic Resource
    Electronic Resource
    Spatial coherence of azimuthally symmetric Gaussian electromagnetic beams (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 6973-6980 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The spatial coherence properties of azimuthally symmetric electromagnetic beams launched by planar Gaussian sources are investigated. The intensity distribution and the coherence properties of the source do not vary in the azimuthal direction. A procedure is postulated for obtaining the root mean squared coherence length as a function of position in a plane transverse to the propagation direction. The variation of the root mean squared coherence length with the position in a transverse plane as well as along the propagation direction is treated. The dependence of these variations on the source coherence parameter relative to the beam waist at the source plane is discussed. On propagation, the root mean squared coherence length at any point in a transverse plane other than on the beam axis is found to vary in the azimuthal direction although cylindrical symmetry is preserved with respect to the variation of the location of the point in the azimuthal direction. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1326472
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