The Experts below are selected from a list of 285 Experts worldwide ranked by ideXlab platform
Mark L. Brongersma - One of the best experts on this subject based on the ideXlab platform.
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Probing complex reflection coefficients in one-dimensional surface plasmon polariton waveguides and cavities using STEM EELS.
Nano letters, 2014Co-Authors: David T. Schoen, Ashwin C. Atre, Aitzol García-etxarri, Jennifer A. Dionne, Mark L. BrongersmaAbstract:The resonant properties of a plasmonic cavity are determined by the size of the cavity, the surface plasmon polariton (SPP) Dispersion Relationship, and the complex reflection coefficients of the c...
Caroline Derec - One of the best experts on this subject based on the ideXlab platform.
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Soap film vibration: origin of the dissipation.
Soft Matter, 2014Co-Authors: Sébastien Kosgodagan Acharige, Florence Elias, Caroline DerecAbstract:We investigate the complex Dispersion Relationship of a transverse antisymmetric wave on a horizontal soap film. Experimentally, the complex wave number k at a fixed forcing frequency is determined by measuring the vibrating amplitude of the soap film: the wavelength (linked to the real part of k) is determined by the spatial variation of the amplitude; the decay length (linked to the imaginary part of k) is determined by analyzing the resonance curves of the vibrating wave as a function of frequency. Theoretically, we compute the complex Dispersion Relationship taking into account the physical properties of the bulk liquid and gas phase, and of the gas–liquid interfaces. The comparison between the computation (developed to the leading order under our experimental conditions) and the experimental results confirms that the phase velocity is fixed by the interplay between surface tension, and liquid and air inertia, as reported in previous studies. Moreover, we show that the attenuation of the transverse antisymmetric wave originates from the viscous dissipation in the gas phase surrounding the liquid film. This result is an important step in understanding the propagation of an acoustic wave in liquid foam, using a bottom-up approach.
Arun Majumdar - One of the best experts on this subject based on the ideXlab platform.
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diffuse mismatch model of thermal boundary conductance using exact phonon Dispersion
Applied Physics Letters, 2005Co-Authors: Pramod Reddy, Kenneth Castelino, Arun MajumdarAbstract:The acoustic mismatch model (AMM) and the diffuse mismatch model (DMM) have been traditionally used to calculate the thermal boundary conductance of interfaces. In these calculations, the phonon Dispersion Relationship is usually approximated by a linear Relationship (Debye approximation). This is accurate for wave vectors close to the zone center, but deviates significantly for wave vectors near the zone edges. Here, we present DMM calculations of the thermal conductance of Al–Si, Al–Ge, Cu–Si, and Cu–Ge interfaces by taking into account the full phonon Dispersion Relationship over the entire Brillouin zone obtained using the Born-von Karman model (BKM). The thermal boundary conductance thus calculated deviates significantly from DMM predictions obtained using the Debye model in all cases.
Kevin F. Brennan - One of the best experts on this subject based on the ideXlab platform.
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Comparison of Non-Parabolic Hydrodynamic Models Based On Different Band Structure Models
VLSI Design, 1998Co-Authors: Arlynn W. Smith, Kevin F. BrennanAbstract:This paper presents two non-parabolic hydrodynamic model formulations suitable for the simulation of inhomogeneous semiconductor devices. The first formulation uses the Kane Dispersion Relationship, (ℏk)2/2m = W(1
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Comparison of different formulations of the electron‐plasmon scattering rate and the Dispersion relation on bulk semiconductor transport
Journal of Applied Physics, 1991Co-Authors: Nabil S. Mansour, Karim Diff, Kevin F. BrennanAbstract:We compare the effect of two different formulations of the electron‐plasmon scattering rate, the electron‐field and electron‐electron models, as well as different formulations of the Dispersion Relationship on the calculated bulk transport properties of degenerate GaAs. The calculations are performed using an ensemble Monte Carlo simulation which includes an analytical nonparabolic model of the principle valleys in the conduction band, and all of the dominant scattering mechanisms. It was previously found that the functional form of the Dispersion Relationship significantly alters the magnitude of the electron‐plasmon scattering rate. As a consequence, the steady‐state velocity‐field characteristics are also significantly altered by as much as ∼40% by the choice of the Dispersion relation. It is further found that the choice of either the electron‐electron or electron‐field model does not by itself significantly alter the calculated results. Therefore, either model can be used to describe the effects of e...
Joshua Bostwick - One of the best experts on this subject based on the ideXlab platform.
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Extracting the surface tension of soft gels from elastocapillary wave behavior
Soft matter, 2018Co-Authors: Xingchen Shao, John R. Saylor, Joshua BostwickAbstract:Mechanically-excited waves appear as surface patterns on soft agarose gels. We experimentally quantify the Dispersion Relationship for these waves over a range of shear modulus in the transition zone where the surface energy (capillarity) is comparable to the elastic energy of the solid. Rayleigh waves and capillary-gravity waves are recovered as limiting cases. Gravitational forces appear as a pre-stress through the self-weight of the gel and are important. We show the experimental data fits well to a proposed Dispersion Relationship which differs from that typically used in studies of capillary to elastic wave crossover. We use this combined theoretical and experimental analysis to develop a new technique for measuring the surface tension of soft materials, which has been historically difficult to measure directly.
