Quasi-Homogeneous Backward-Wave Plasmonic Structures: Theory and Accurate Simulation

Details Quasi-Homogeneous Backward-Wave Plasmonic Structures: Theory and Accurate Simulation Quasi-Homogeneous Backward-Wave Plasmonic Structures: Theory and Accurate Simulation

2008-07-10

arxiv.org/abs/0807.1707v1

Physics

Optics

4 pages, 3 figures

Scientific paper

Backward waves and negative refraction are shown to exist in plasmonic crystals whose lattice cell size is a very small fraction of the vacuum wavelength (less than 1/40th in an illustrative example). Such ``quasi-homogeneity'' is important, in particular, for high-resolution imaging. Real and complex Bloch bands are computed using the recently developed finite-difference calculus of ``Flexible Local Approximation MEthods'' (FLAME) that produces linear eigenproblems, as opposed to quadratic or nonlinear ones typical for other techniques. FLAME dramatically improves the accuracy by incorporating local analytical approximations of the solution into the numerical scheme.

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