Journal
OPTICS LETTERS
Volume 33, Issue 8, Pages 848-850Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.33.000848
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We investigate the local optical response of split-ring resonator-(SRR)-based metamaterials with an apertureless scanning near-field optical microscope. By mapping the near fields of suitably resonant micrometersized SRRs in the near-infrared spectral region with an uncoated silicon tip, we obtain a spatial resolution of better than lambda/50. The experimental results confirm numerical predictions of the near-field excitations of SRRs. Combining experimental near-field optical studies with near- and far-field optical simulations provides a detailed understanding of resonance mechanisms in subwavelength structures and will facilitate an efficient approach to improved designs. (C) 2008 Optical Society ofAmerica.
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