Open Access. Powered by Scholars. Published by Universities.®
- Keyword
Articles 1 - 6 of 6
Full-Text Articles in Physics
Semiclassical Scattering Of An Electric Dipole Source Inside A Spherical Particle, James A. Lock
Semiclassical Scattering Of An Electric Dipole Source Inside A Spherical Particle, James A. Lock
Physics Faculty Publications
Semiclassical scattering phenomena appearing in the far-zone scattered intensity of a point source of electromagnetic radiation inside a spherical particle are examined in the context of both ray theory and wave theory, and the evolution of the phenomena is studied as a function of source position. A number of semiclassical effects that do not occur for plane-wave scattering by the sphere appear prominently for scattering by an interior source. These include a series of scattering resonances and a new family of rainbows in regions of otherwise total internal reflection. Diffractive effects accompanying the semiclassical phenomena are also examined. (C) 2001 …
Design And Construction Of A Space-Borne Optical Tweezer Apparatus, Andrew Resnick
Design And Construction Of A Space-Borne Optical Tweezer Apparatus, Andrew Resnick
Physics Faculty Publications
A compact optical tweezer package has been developed for use on a microscope to be flown on the International Space Station as part of a series of experiments in colloid crystallization. A brief introduction to the principles of single-beam optical tweezer operation will be presented, after which a detailed system layout will be shown. Special design requirements due to the spaceflight nature of the hardware will also be discussed. The tweezer apparatus is capable of trapping many particles through use of a two-axis acousto-optical deflector. The trap strength is sufficient to perform the required science (50 pN at Δn=0.2). The …
Electric Field Autocorrelation Functions For Beginning Multiple Rayleigh Scattering, James A. Lock
Electric Field Autocorrelation Functions For Beginning Multiple Rayleigh Scattering, James A. Lock
Physics Faculty Publications
The polarization-resolved electric field autocorrelation function for p-order scattering was derived from the order-of-scattering solution of the exact equations for electromagnetic multiple Rayleigh scattering and was calculated for 2 less than or equal to p less than or equal to 6 for particles undergoing diffusive motion in an idealized sample cell. It was found that the polarization-channel and the scattering-angle dependence of the p-order autocorrelation function approximately decoupled from the delay-time dependence for p greater than or similar to 3. The polarization-channel and the scattering-angle dependence were analytically calculated, and the delay-time dependence was analytically approximated. The resulting analytical model …
X-Ray Photoelectron Spectroscopy (Xps) And Magnetization Studies Of Iron–Vanadium Phosphate Glasses, M. A. Salim, G. D. Khattak, Petru S. Fodor, Lowell E. Wenger
X-Ray Photoelectron Spectroscopy (Xps) And Magnetization Studies Of Iron–Vanadium Phosphate Glasses, M. A. Salim, G. D. Khattak, Petru S. Fodor, Lowell E. Wenger
Physics Faculty Publications
Vanadium phosphate glasses containing Fe2O3 with the chemical composition [(Fe2O3)x(V2O5)0.6−x(P2O5)0.4], where x=0.00, 0.10, 0.20, 0.25 and 0.30, have been prepared and investigated by X-ray photoelectron spectroscopy (XPS) and magnetic susceptibility measurements. The core level binding energies of V 2p, Fe 2p, P 2p and P 2s in the Fe2O3–vanadium phosphate glasses have been measured and shifts from the corresponding binding energies measured for V2O5, Fe2O3 and P2O5 powders are accounted for by changes in the next-nearest neighbor environment of these atoms in the P4O10 local structure. The O 1s spectra for the glasses are single, symmetric peaks arising from nearly …
Supernumerary Spacing Of Rainbows Produced By An Elliptical-Cross-Section Cylinder. Ii. Experiment, Charles L. Adler, David Phipps, Kirk W. Saunders, Justin K. Nash, James A. Lock
Supernumerary Spacing Of Rainbows Produced By An Elliptical-Cross-Section Cylinder. Ii. Experiment, Charles L. Adler, David Phipps, Kirk W. Saunders, Justin K. Nash, James A. Lock
Physics Faculty Publications
We measured the supernumerary spacing parameter of the first- and second-order rainbows of two glass rods, each having an approximately elliptical cross section, as a function of the rod's rotation angle. We attribute large fluctuations in the supernumerary spacing parameter to small local inhomogeneities in the rod's refractive index. The low-pass filtered first-order rainbow experimental data agree with the prediction of ray-tracing-wave-front modeling to within a few percent, and the second-order rainbow data exhibit additional effects that are due to rod nonellipticity. (C) 2001 Optical Society of America.
Experimental Observation Of Rainbow Scattering By A Coated Cylinder: Twin Primary Rainbows And Thin-Film Interference, Charles L. Adler, James A. Lock, Justin K. Nash, Kirk W. Saunders
Experimental Observation Of Rainbow Scattering By A Coated Cylinder: Twin Primary Rainbows And Thin-Film Interference, Charles L. Adler, James A. Lock, Justin K. Nash, Kirk W. Saunders
Physics Faculty Publications
We experimentally examine the primary rainbow created by the illumination of a coated cylinder. We present a simple technique for varying the coating thickness over a wide range of values, and we see evidence for two different scattering regimes. In one, where the coating thickness is large, twin rainbows are produced. In the second, where the coating is thin enough to act as a thin film, a single rainbow is produced whose intensity varies periodically as the coating thickness varies. We find good agreement with previous theoretical predictions. (C) 2001 Optical Society of America.