Photonic crystals of coated metallic spheres

Details Photonic crystals of coated metallic spheres Photonic crystals of coated metallic spheres

2000-03-31

arxiv.org/abs/cond-mat/0003518v1

Europhys. Lett. 50, 466-472 (2000)

Physics

Condensed Matter

14 pages, plain latex, 3 ps figures, to appear in Europhys. Lett. For more info on this subject see http://www.amolf.nl/rese

Scientific paper

10.1209/epl/i2000-00292-4

It is shown that simple face-centered-cubic (fcc) structures of both metallic and coated metallic spheres are ideal candidates to achieve a tunable complete photonic bandgap (CPBG) for optical wavelengths using currently available experimental techniques. For coated microspheres with the coating width to plasma wavelength ratio $l_c/\lambda_p \leq 10%$ and the coating and host refractive indices $n_c$ and $n_h$, respectively, between 1 and 1.47, one can always find a sphere radius $r_s$ such that the relative gap width $g_w$ (gap width to the midgap frequency ratio) is larger than 5% and, in some cases, $g_w$ can exceed 9%. Using different coatings and supporting liquids, the width and midgap frequency of a CPBG can be tuned considerably.

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