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Electron beam lithography was used to fabricate gold crescent shaped split-ring resonators with 30nm minimum feature size. By varying the crescent’s arc length over a range of nanometer-scale dimensions the authors demonstrate the tuneability of visible resonances within such structures. Results, which correlate closely with those predicted using finite-difference time-domain modeling, open the way for these devices to be used in near-field biological sensing.
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Clark et al. (2007) studied this question.
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