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11 June 2024 Plasmon-induced long-lived hot electron dynamics in hyperbolic meta-antennas
Rakesh Dhama, Humeyra Caglayan
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Proceedings Volume PC12991, Nanophotonics X; PC1299104 (2024) https://doi.org/10.1117/12.3016418
Event: SPIE Photonics Europe, 2024, Strasbourg, France
Abstract
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. First, we demonstrate the extended plasmon-modulated photoluminescence spectrum in HMA towards longer wavelengths due to its scattering spectrum in comparison to the corresponding NDA. Then, we demonstrate that the tunable absorption band of HMA controls and modifies the lifetime of the plasmon-induced hot electrons with enhanced excitation efficiency in the near-infrared region and broadens the utilization of the visible/NIR spectrum in comparison to NDA.
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Rakesh Dhama and Humeyra Caglayan "Plasmon-induced long-lived hot electron dynamics in hyperbolic meta-antennas", Proc. SPIE PC12991, Nanophotonics X, PC1299104 (11 June 2024); https://doi.org/10.1117/12.3016418
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KEYWORDS
Plasmonics
Absorption
Scattering
Hot carriers
Nanostructures
Optoelectronics
Photocatalysis
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