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Yan Zhang - One of the best experts on this subject based on the ideXlab platform.

  • a unique lateral displacement of a Gaussian beam transmitted through a slab with negative permittivity and permeability
    Microwave and Optical Technology Letters, 2002
    Co-Authors: Jin Au Kong, Baeian Wu, Yan Zhang
    Abstract:

    This Letter demonstrates a unique negative lateral shift of a Gaussian beam transmitted through a slab with both negative permittivity and permeability, which is distinctly different from a shift caused by a regular dielectric slab. The incident beam is modeled as a tapered wave with a Gaussian Spectrum. The waves inside and outside the slab are solved analytically from Maxwell's equations by matching the boundary conditions at the interfaces. It is shown that the field values in all regions can be unambiguously determined. Numerical simulations are presented and the field values as well as the power densities are computed for all regions. A dramatic negative lateral shift is observed when both e and μ are negative. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 33: 136–139, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10255

  • lateral displacement of a Gaussian beam reflected from a grounded slab with negative permittivity and permeability
    Applied Physics Letters, 2002
    Co-Authors: Jin Au Kong, Baeian Wu, Yan Zhang
    Abstract:

    A unique negative lateral shift is demonstrated in this letter for a Gaussian beam reflected from a grounded slab with both negative permittivity and permeability, which is distinctly different from a shift caused by a regular grounded slab. The incident beam is modeled as a tapered wave with a Gaussian Spectrum. The waves inside and outside the slab are solved analytically from Maxwell’s equations by matching the boundary conditions at the interfaces. It is shown that the field values in all regions can be unambiguously determined. Numerical simulations are presented and the field values as well as the power densities are computed for all regions, and a dramatic negative lateral shift is observed when both e and μ are negative.

Jin Au Kong - One of the best experts on this subject based on the ideXlab platform.

  • a unique lateral displacement of a Gaussian beam transmitted through a slab with negative permittivity and permeability
    Microwave and Optical Technology Letters, 2002
    Co-Authors: Jin Au Kong, Baeian Wu, Yan Zhang
    Abstract:

    This Letter demonstrates a unique negative lateral shift of a Gaussian beam transmitted through a slab with both negative permittivity and permeability, which is distinctly different from a shift caused by a regular dielectric slab. The incident beam is modeled as a tapered wave with a Gaussian Spectrum. The waves inside and outside the slab are solved analytically from Maxwell's equations by matching the boundary conditions at the interfaces. It is shown that the field values in all regions can be unambiguously determined. Numerical simulations are presented and the field values as well as the power densities are computed for all regions. A dramatic negative lateral shift is observed when both e and μ are negative. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 33: 136–139, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10255

  • lateral displacement of a Gaussian beam reflected from a grounded slab with negative permittivity and permeability
    Applied Physics Letters, 2002
    Co-Authors: Jin Au Kong, Baeian Wu, Yan Zhang
    Abstract:

    A unique negative lateral shift is demonstrated in this letter for a Gaussian beam reflected from a grounded slab with both negative permittivity and permeability, which is distinctly different from a shift caused by a regular grounded slab. The incident beam is modeled as a tapered wave with a Gaussian Spectrum. The waves inside and outside the slab are solved analytically from Maxwell’s equations by matching the boundary conditions at the interfaces. It is shown that the field values in all regions can be unambiguously determined. Numerical simulations are presented and the field values as well as the power densities are computed for all regions, and a dramatic negative lateral shift is observed when both e and μ are negative.

Anna Sergeeva - One of the best experts on this subject based on the ideXlab platform.

  • an experimental study of spatial evolution of statistical parameters in a unidirectional narrow banded random wavefield
    Journal of Geophysical Research, 2009
    Co-Authors: L[ev] Shemer, Anna Sergeeva
    Abstract:

    [1] Unidirectional random waves generated by a wavemaker in a 300-m-long wave tank are investigated experimentally. Spatial evolution of numerous statistical wavefield parameters is studied. Three series of experiments are carried out for different values of the nonlinear parameter e. It is found that the frequency Spectrum of the wavefield undergoes significant variation in the course of the wavefield evolution along the tank. The initially narrow Gaussian Spectrum becomes wider at the early stages of the evolution and then narrower again, although it still remains wider than the initial Spectrum at the most distant measuring location. It is found that the values of all the statistical wave parameters are strongly related to the local spectral width. The deviations of various statistical parameters from the Gaussian statistics increase with the width of the Spectrum so that the probability of extremely large (the so-called freak) waves is highest when the local spectral width attains maximum. The deviations from the Rayleigh distribution also become more pronounced when the nonlinearity parameter e is higher. It is found that the Tayfun and Fedele 3rd order random wavefield model provides an appropriate description of the observed phenomena. An attempt is made to relate the spatial variations of the wavefield statistics reported here to the wavefield recurrence, as suggested recently.

  • numerical modeling of the kdv random wave field
    European Journal of Mechanics B-fluids, 2006
    Co-Authors: Efim Pelinovsky, Anna Sergeeva
    Abstract:

    Abstract The evolution of the initially random wave field with a Gaussian Spectrum shape is studied numerically within the Korteweg–de Vries (KdV) equation. The properties of the KdV random wave field are analyzed: transition to a steady state, equilibrium spectra, statistical moments of a random wave field, and the distribution functions of the wave amplitudes. Numerical simulations are performed for different Ursell parameters and Spectrum width. It is shown that the wave field relaxes to the stationary state (in statistical sense) with the almost uniform energy distribution in low frequency range (Rayleigh–Jeans Spectrum). The wave field statistics differs from the Gaussian one. The growing of the positive skewness and non-monotonic behavior of the kurtosis with increase of the Ursell parameter are obtained. The probability of a large amplitude wave formation differs from the Rayleigh distribution.

Baeian Wu - One of the best experts on this subject based on the ideXlab platform.

  • a unique lateral displacement of a Gaussian beam transmitted through a slab with negative permittivity and permeability
    Microwave and Optical Technology Letters, 2002
    Co-Authors: Jin Au Kong, Baeian Wu, Yan Zhang
    Abstract:

    This Letter demonstrates a unique negative lateral shift of a Gaussian beam transmitted through a slab with both negative permittivity and permeability, which is distinctly different from a shift caused by a regular dielectric slab. The incident beam is modeled as a tapered wave with a Gaussian Spectrum. The waves inside and outside the slab are solved analytically from Maxwell's equations by matching the boundary conditions at the interfaces. It is shown that the field values in all regions can be unambiguously determined. Numerical simulations are presented and the field values as well as the power densities are computed for all regions. A dramatic negative lateral shift is observed when both e and μ are negative. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 33: 136–139, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10255

  • lateral displacement of a Gaussian beam reflected from a grounded slab with negative permittivity and permeability
    Applied Physics Letters, 2002
    Co-Authors: Jin Au Kong, Baeian Wu, Yan Zhang
    Abstract:

    A unique negative lateral shift is demonstrated in this letter for a Gaussian beam reflected from a grounded slab with both negative permittivity and permeability, which is distinctly different from a shift caused by a regular grounded slab. The incident beam is modeled as a tapered wave with a Gaussian Spectrum. The waves inside and outside the slab are solved analytically from Maxwell’s equations by matching the boundary conditions at the interfaces. It is shown that the field values in all regions can be unambiguously determined. Numerical simulations are presented and the field values as well as the power densities are computed for all regions, and a dramatic negative lateral shift is observed when both e and μ are negative.

Tadao Nagatsuma - One of the best experts on this subject based on the ideXlab platform.

  • generation of an optical frequency comb with a Gaussian Spectrum using a linear time to space mapping system
    Optics Express, 2010
    Co-Authors: Shintaro Hisatake, Keiji Tada, Tadao Nagatsuma
    Abstract:

    We demonstrate the generation of an optical frequency comb (OFC) with a Gaussian Spectrum using a continuous-wave (CW) laser, based on spatial convolution of a slit and a periodically moving optical beam spot in a linear time-to-space mapping system. A CW optical beam is linearly mapped to a spatial signal using two sinusoidal electro-optic (EO) deflections and an OFC is extracted by inserting a narrow spatial slit in the Fourier-transform plane of a second EO deflector (EOD). The spectral shape of the OFC corresponds to the spatial beam profile in the near-field region of the second EOD, which can be manipulated by a spatial filter without spectral dispersers. In a proof-of-concept experiment, a 16.25-GHz-spaced, 240-GHz-wide Gaussian-envelope OFC (corresponding to 1.8 ps Gaussian pulse generation) was demonstrated.