Photonic band gaps from metallo-dielectric spheres

Joint theoretical and experimental e!orts are launched to study the optical properties of photonic band-gap systems constructed with spheres containing a metal core or metallic coating. Using a multiple scattering method, we show that there can be photonic band gaps in di!erent types of periodic structures as long as the sphere "lling ratio exceeds a certain minimum. We have experimentally realized photonic crystals in the microwave regime, with the measured results in excellent agreement with the theoretical predictions. ( 2000 Elsevier Science B.V. All rights reserved.

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