Abstract

Conventional plasmonic nanoantennas enable scattering and absorption bands at the same wavelength region, which makes their utilization to full potential impossible for both features simultaneously [1-2]. Here, we take advantage of spectrally separated scattering and absorption resonance bands in hyperbolic meta-antennas (HMA) to enhance the hot electron generation and prolong the relaxation dynamics of hot carriers. In this regard, for the realization of HMA, multilayered metal-dielectric structures based on gold/silica stacking layers are designed and fabricated to separate well-defined scattering and absorption bands. In contrast, conventional plasmonic (gold) nanodisk antennas (NDA) of thickness equivalent to that of total metal layers of an HMA are also realized as reference samples to distinguish the effect of multilayer HMA.

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