Volume 119, Number 1, July 2017
|Number of page(s)||7|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||11 September 2017|
Size-dependent nonlocal effects in plasmonic semiconductor particles
1 Department of Photonics Engineering, Technical University of Denmark - Ørsteds Plads 343, DK-2800 Kongens Lyngby, Denmark
2 Center for Nano Optics & Danish Institute for Advanced Study, University of Southern Denmark - Campusvej 55, DK-5230 Odense M, Denmark
3 Center for Nanostructured Graphene, Technical University of Denmark - Ørsteds Plads 343, DK-2800 Kongens Lyngby, Denmark
Received: 12 June 2017
Accepted: 16 August 2017
Localized surface plasmons (LSP) in semiconductor particles are expected to exhibit spatial nonlocal response effects as the geometry enters the nanometer scale. To investigate these nonlocal effects, we apply the hydrodynamic model to nanospheres of two different semiconductor materials: intrinsic InSb and n-doped GaAs. Our results show that the semiconductors indeed display nonlocal effects, and that these effects are even more pronounced than in metals. In a 150 nm InSb particle at 300 K, the LSP frequency is blueshifted 35%, which is orders of magnitude larger than the blueshift in a metal particle of the same size. This property, together with their tunability, makes semiconductors a promising platform for experiments in nonlocal effects.
PACS: 78.20.Bh – Theory, models, and numerical simulation / 73.20.Mf – Collective excitations (including excitons, polarons, plasmons and other charge-density excitations) / 78.30.Fs – III-V and II-VI semiconductors
© EPLA, 2017
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