Abstract
Two periodic structures with different effective impedances, both comprising alternate layers of a positive and a negative permittivity material, are considered in the infrared. We find that the Fabry–Perot resonance effect periodically influences the sharpness of subwavelength focusing as the total thicknesses of the two structures increase, especially for the impedance-matched structure. On the basis of the improved multilayered structures, we design an optimized structure (i.e., the effective impedance is chosen between 0 and 1) for which a higher resolution less than (λ is the wavelength in the air) can be obtained through weighing the advantages and disadvantages of the two different multilayered structures and choosing appropriate surface terminations.
© 2009 Optical Society of America
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