Abstract

Pure noble metals are usually considered to be negative-permittivity materials for multilayered structures. Such structures can produce flat equal-frequency contours and achieve subwavelength resolution by enabling all propagating and partial evanescent components of the source radiation to be transformed into propagating harmonics. We show that using a composite metal–dielectric layer with an appropriate metal filling factor instead of a negative-permittivity layer can facilitate operation at practically any desired wavelength and achieve good resolution $\left(0.057\lambda \right)$ and that appropriate surface termination can improve the quality of imaging effectively.

© 2009 Optical Society of America

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