Journal
OPTICS LETTERS
Volume 37, Issue 9, Pages 1592-1594Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.37.001592
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- Alexander von Humboldt Foundation, Germany
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We utilize three diffraction theories to investigate the focal-shift phenomena of plasmonic lenses. By taking the Fresnel number into account, a better accuracy in predicting the relative focal shift can be achieved for low-Fresnel-number systems. On the basis of this focal-shift effect, we present a method to realize an active plasmonic lens. Two-dimensional finite-difference time-domain simulation is performed to verify the method proposed. (C) 2012 Optical Society of America
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