Focusing of electromagnetic waves by periodic arrays of dielectric cylinders

摘要

By numerical simulations, we show that properly arranged two dimensionalperiodic arrays, formed by dielectric cylinders embedded in parallel in auniform medium, can indeed act as an optical lens to focus electromagneticwaves, in accordance with the recent conjecture in the literature. Thenumerical simulations are based on an exact multiple scattering technique. Theresults suggest that the E-polarized waves are easier to be focused than theH-polarized waves. The robustness of the focusing against disorders is alsostudied. Comparison with the corresponding cases for acoustic waves is alsodiscussed.