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. 2015 Nov 10;5:16436. doi: 10.1038/srep16436

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Copyright © 2015, Macmillan Publishers Limited

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(a–d) FTIR spectroscopy characterization of ordered arrays of vertical hollow nanotubes, for different heights (h = 1.2–3.4–5.0–7.5 μm) and different interantenna distances (p). Among the most evident traits of 3D arrays of nanoantennas is the extraordinarily high number of resonance modes – up to 12 in the studied IR range, for 7.5 μm tall structures (Fig. 3d) – and an almost complete energy absorption (50% of unpolarized light) even for relatively small active areas (5 × 5 structures, see text for details); (e,f) numeric calculations and experimental data for angle-resolved specular reflectance (R0) spectra, nanoantenna array height h = 1.2 μm, pitch p = 4.1 μm (simulations: impinging angles between 0°–80°, experimental: 10°–70°).