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Adriaan Tip's Abstract
Photonic crystals made up from dispersive and absorptive dielectrics.
Small metallic objects can have a strongly dispersive electric
susceptibility, which makes them interesting candidates for the
construction of photonic crystals with a band gap. Indeed it is possible to
obtain a large dielectric contrast in certain frequency ranges, a desirable
feature for the existence of photonic band gaps.
On the other hand, dispersive behavior goes hand in hand with absorption
and this raises the question how to deal with such systems. Important
issues are band structure, the local density of states, energy
conservation, quantization and perturbation expansions for small absorption.
We discuss a few aspects of the progress made in this field, including some
numerical results.
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