Fano Resonance Between Mie and Bragg Scattering in Photonic Crystals

Details Fano Resonance Between Mie and Bragg Scattering in Photonic Crystals Fano Resonance Between Mie and Bragg Scattering in Photonic Crystals

2009-02-24

arxiv.org/abs/0902.4053v1

Physics

Optics

Scientific paper

We report the observation of a Fano resonance between continuum Mie scattering and a narrow Bragg band in synthetic opal photonic crystals. The resonance leads to a transmission spectrum exhibiting a Bragg dip with an asymmetric profile, which can be tunably reversed to a Bragg rise. The Fano asymmetry parameter is linked with the dielectric contrast between the permittivity of the filler and the specific value determined by the opal matrix. The existence of the Fano resonance is directly related to disorder due to non-uniformity of a-SiO2 opal spheres. Proposed theoretical "quasi-3D" model produces results in excellent agreement with the experimental data.

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