Anomalous scattering from dielectric bispheres in the specular direction

Abstract

Resonant scattering from dielectric bispheres in the specular direction (the so-called specular resonance), previously known only in the microwave range, has been observed at the optical wavelength. Systematic experiments with micrometer-sized dielectric bispheres assembled by micromanipulation, together with rigorous numerical calculations, reveal that this scattering is a precursor of the classical rainbow and is a general phenomenon observed in the wide range of size parameters ($>5$ for $n=1.59$) for various refractive indices.

© 2002 Optical Society of America

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