Surface-Assisted Carrier Excitation in Plasmonic Nanostructures

We present a quantum-mechanical model for surface-assisted carrier excitation by optical fields in plasmonic nanostructures of arbitrary shape. We derive an explicit expression, in terms of local fields inside the metal structure, for surface absorbed power and surface scattering rate that determine...

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Bibliographic Details
Published in:	Plasmonics (Norwell, Mass.) Mass.), 2018-06, Vol.13 (3), p.757-761
Main Author:	Shahbazyan, Tigran V.
Format:	Article
Language:	eng
Subjects:	Biochemistry Biological and Medical Physics Biophysics Biotechnology Carriers Chemistry Chemistry and Materials Science Decay rate Excitation Landau damping Nanostructure Nanotechnology Photochemistry Photovoltaic cells Scattering Solar cells
Online Access:	Get full text
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Summary:	We present a quantum-mechanical model for surface-assisted carrier excitation by optical fields in plasmonic nanostructures of arbitrary shape. We derive an explicit expression, in terms of local fields inside the metal structure, for surface absorbed power and surface scattering rate that determine the enhancement of carrier excitation efficiency near the metal-dielectric interface. We show that surface scattering is highly sensitive to the local field polarization and can be incorporated into metal-dielectric function along with phonon and impurity scattering. We also show that the obtained surface scattering rate describes surface-assisted plasmon decay (Landau damping) in nanostructures larger than the nonlocality scale. Our model can be used for calculations of plasmon-assisted hot carrier generation rates in photovoltaics and photochemistry applications.
ISSN:	1557-1955 1557-1963