We demonstrate two-dimensional control of coherent modes of surface plasmons (SP) in a metallic array of subwavelength apertures. SP mode intensity and propagation direction is manipulated by varying the wavelength, incidence angle, and polarization of the excitation photons. We also demonstrate directional beaming of light from this device. Finite-difference-time-domain simulations of the SP m...

We present an on-chip optical mode exchange between two multiplexed modes by using tapered directional couplers on silicon-on-insulator platform. The device consisting of mode multiplexing and mode exchange is compact with relatively large fabrication error tolerance. The simulation results show efficient higher order mode excitation and mode exchange. A low excess loss less than 0.5 dB and hig...

Ultracold Rb atoms were used to demonstrate nondegenerate four-wave mixing through a Rydberg state. Continuous 5S-5P-nD two-photon excitation to the Rydberg state was combined with an nD-6P tuned laser in a phase-matched geometry. The angular dependence, spatial profile, and dependence on detuning were investigated, showing good agreement with theory. Under optimum conditions 50% of the radiati...

in the present paper axial distributions of plasma and floating potentials, electron and iondensities and eedf have been measured in the dl region of a hg discharge constriction. an attempt hasbeen made for the resolution of opposing charged layer structures in dl. excitation processes in theconstriction region are studied. using the linearization method for the nonstationary balance equationss...

This paper considers source excitation strategies in finite difference time domain room acoustics simulations for auralization purposes. We demonstrate that FDTD simulations can be conducted to obtain impulse responses based on unit impulse excitation, this being the shortest, simplest and most efficiently implemented signal that might be applied. Single, rather than double, precision accuracy ...

Dynamic control of the direction of radiation of the light emanating from a subwavelength slit carved out of a thin metal film is experimentally demonstrated. This is achieved by selective excitation of the individual guided modes in the slit by setting the phase of three coherent laser beams. By changing the voltage across a piezoelement, we obtain unprecedented directional steering, without r...

In [2], Duhamel obtained the optimal endfire array excitation by extending the Riblet’s broadside array design method. So, similar to the Riblet’s distribution, the obtained endfire distribution is limited to odd numbered arrays. In this section, authors present a broadened formulation which can be used for both even as well as odd numbered arrays. The basic idea behind this formulation comes f...