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(a) Scanning electron micrograph of a typical SRR array. Scale bar is . Inset shows a schematic of a SAM of ODT molecules in the gap of a single SRR for absorption spectroscopy. (b) Simulated near-field amplitude distribution around a SRR on resonance for polarization along the gap. Near-field is confined mostly in the gap.
(a) Calculated near-field spectrum in the SRR gap with a uniform 2.4 nm layer of a Lorentzian absorber on SRRs to emulate the experiments. (b) Calculated far-field transmission spectrum for the same configuration. Inset is a closer view of the molecular absorption peak superimposed on the SRR spectrum.
Measured transmittance for five SRR arrays with different diameters for polarization along the gap. Vertical lines represent the position of ODT absorption peaks relative to different SRR spectra.
(a) Measured transmittance spectra for three different SRR arrays with radii 170 nm (blue), 180 nm (red), and 210 nm (green) with the SAM. Two peaks corresponding to ODT absorption are clearly visible. (b) Closeup view of the resonance region in (a).
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