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. 2016 Feb 22;7:10685. doi: 10.1038/ncomms10685

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(a) Phase noise spectra at a 1.2-GHz RF carrier at on- and off-resonance wavelengths. (b) Time trace of the beat frequency with and without the plasmonic sample over 3,000 s. (c) Allan deviations of frequency stability with varying average time at the positions of on-resonance and off-resonance wavelengths.