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2 February 2012Design of multiple nanoring-based metallic nanophotonic superlens
In this study, we investigate metallic nanophotonic lenses that consist of multiple nano-ring apertures. Emphasis was
placed on a nanophotonic lens of simple two nano-ring apertures modeled on a BK7 substrate with capping and adhesion
layers. Electromagnetic fields were numerically calculated in response to metal, substrate, and ambient changes when the
distance of two nano-ring apertures varies at an aperture depth and width fixed at 50 and 350 nm. The results indicate
that control over fairly broad ranges of focal lengths and intensities can be achieved, which is expected to be useful to
implement an optical element for various nanoscale imaging applications.