221 research outputs found

    Optimal design of nanoplasmonic materials using genetic algorithms as a multi-parameter optimization tool

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    An optimal control approach based on multiple parameter genetic algorithms is applied to the design of plasmonic nanoconstructs with pre-determined optical properties and functionalities. We first develop nanoscale metallic lenses that focus an incident plane wave onto a pre-specified, spatially confined spot. Our results illustrate the role of symmetry breaking and unravel the principles that favor dimeric constructs for optimal light localization. Next we design a periodic array of silver particles to modify the polarization of an incident, linearly-polarized plane wave in a desired fashion while localizing the light in space. The results provide insight into the structural features that determine the birefringence properties of metal nanoparticles and their arrays. Of the variety of potential applications that may be envisioned, we note the design of nanoscale light sources with controllable coherence and polarization properties that could serve for coherent control of molecular or electronic dynamics in the nanoscale.Comment: 13 pages, 6 figures. submitted to J. Chem. Phy

    Managing Information Overload: Is Technology the Answer?

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    A Modified Differential Pickup Reflection Probe

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    In the eddy current inspection of multi-layered structures in aircrafts, the detection of flaws in the subsurface layers is a significant challenge and requires very sensitive probes. These flaws are often present in the vicinity of edges of the structures and hence the inspection probe should also be capable of discriminating the defect signal from the edge signal. Edges in samples under inspection give rise to very large eddy current signals thereby masking any signals that the probe may detect from a flaw close to the edge. This is referred to as the edge effect, differential flux signal on inside and outside of the driver coil. A thin ferromagnetic shield around the probe coil is included to enhance the sensitivity of this probe

    Photoionization Cross Section of the 6s Electron of Atomic Cesium

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