| 研究実績の概要 |
(1) We investigated whispering gallery mode resonances for dielectrics of different shapes – such as cylindrical, elliptical, square, and triangular. We found but found that cylindrical resonators are the easiest to tune, and they give radiation patterns that are useful for fabricating practical devices - such as wavelength separators - for optical communication and information processing. (2) We computed the optical properties different arrays of silver nanorods (10 - 20 nm in diameter, spacing 20-50 nm) in the visible wavelengths (400-700) nm, where the real part of the electrical permittivity is negative and the rods are thus effectively a metamaterial. We found that by adjusting the spacing and diameter linear arrays oriented perpendicular to the incident light beam (assumed to be Gaussian) the transmitted wavelength can be finely controlled with very los losses. (3) Some of these programs were implemented on a supercomputer. (4)We devised an optimization method to better represent curved boundaries on a rectangular grid (5)We improved the calculation accuracy by using a new source model.(6) We have tested a discrete Green’s function computational methodology for use with the recursive convolution method to compute propagation in dispersive materials. (7)In a side-project we developed a new method to reconstruct shapes using time reversed FDTD.
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