Journal
NANOSCALE
Volume 12, Issue 6, Pages 3827-3833Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr07394a
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Funding
- NSF [CBET 1264550, DMR1921034, DMR 1151783, NSF HDR 1547830]
- PSC CUNY Award [68871-00 46]
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There is significant interest in the utility of asymmetric nanoaperture arrays as substrates for the surface-enhanced detection, fluorescence, and imaging of individual molecules. This work introduces obliquely-cut, out-of-plane, coaxial layered structures on an aperture edge. We refer to these structures as nanofingernails, which emphasizes their curved, oblique, and out-of-plane features. Broadband coupling into chiral hybrid plasmon modes and helicity-dependent near-field scattering without circular dichroism are demonstrated. The unusually-broadband, multipolar modes of nanofingernail micropore structures exhibit phase retardation effects that may be useful for achieving spatial overlap at different frequencies. The nanofingernail geometry shows new potential for simultaneous polarization-enhanced hyperspectral imaging on apertured, plasmonic surfaces.
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