Orientational Selectivity of Hot Electrons Generated by a Dimer of Plasmonic Nanoparticles

Plasmonic nanoparticles are increasingly employed in several fields, thanks to their unique, promising properties. In particular, these particles exhibit a surface plasmon resonance combined with outstanding absorption and scattering properties. They are also easy to synthesize and functionalize, making them ideal for nanotechnology applications. However, the physicochemical properties of these nanoparticles can make them potentially toxic, even if their bulk metallic forms are almost inert. In this review, we aim to provide a more comprehensive understanding of the potential adverse effects of plasmonic nanoparticles in zebrafish (Danio rerio) during both development and adulthood, focusing our attention on the most common materials used, i.e., gold and silver.

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Plasmonic hot-electron photodetection with quasi-bound states in the continuum and guided resonances

Nanophotonics ◽

10.1515/nanoph-2021-0069 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Wenhao Wang ◽

Lucas V. Besteiro ◽

Peng Yu ◽

Feng Lin ◽

Alexander O. Govorov ◽

...

Keyword(s):

Bound States ◽

Structural Parameters ◽

Hybrid Structure ◽

Fine Tuning ◽

Hot Electrons ◽

Hot Electron ◽

Perfect Absorption ◽

High Loss ◽

Guided Mode ◽

The Continuum

Abstract Hot electrons generated in metallic nanostructures have shown promising perspectives for photodetection. This has prompted efforts to enhance the absorption of photons by metals. However, most strategies require fine-tuning of the geometric parameters to achieve perfect absorption, accompanied by the demanding fabrications. Here, we theoretically propose a Ag grating/TiO2 cladding hybrid structure for hot electron photodetection (HEPD) by combining quasi-bound states in the continuum (BIC) and plasmonic hot electrons. Enabled by quasi-BIC, perfect absorption can be readily achieved and it is robust against the change of several structural parameters due to the topological nature of BIC. Also, we show that the guided mode can be folded into the light cone by introducing a disturbance to become a guided resonance, which then gives rise to a narrow-band HEPD that is difficult to be achieved in the high loss gold plasmonics. Combining the quasi-BIC and the guided resonance, we also realize a multiband HEPD with near-perfect absorption. Our work suggests new routes to enhance the light-harvesting in plasmonic nanosystems.

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Amplification of Sound by Hot Electrons

IBM Journal of Research and Development ◽

10.1147/rd.91.0069 ◽

1965 ◽

Vol 9 (1) ◽

pp. 69-70 ◽

Cited By ~ 2

Author(s):

P. J. Price

Keyword(s):

Hot Electrons

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