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Scattering of a plasmonic nanoantenna embedded in a silicon waveguide

Scattering of a plasmonic nanoantenna embedded in a silicon waveguide
Scattering of a plasmonic nanoantenna embedded in a silicon waveguide
Plasmonic antennas integrated on silicon devices have large and yet unexplored potential for controlling and routing light signals. Here, we present theoretical calculations of a hybrid silicon-metallic system in which a single gold nanoantenna embedded in a single-mode silicon waveguide acts as a resonance-driven filter. As a consequence of scattering and interference, when the resonance condition of the antenna is met, the transmission drops by 85% in the resonant frequency band. Firstly, we study analytically the interaction between the propagating mode and the antenna by including radiative corrections to the scattering process and the polarization of the waveguide walls. Secondly, we find the configuration of maximum interaction and numerically simulate a realistic nanoantenna in a silicon waveguide. The numerical calculations show a large suppression of transmission and three times more scattering than absorption, consequent with the analytical model. The system we propose can be easily fabricated by standard silicon and plasmonic lithographic methods, making it promising as real component in future optoelectronic circuits.
1094-4087
28108-28118
Castro-Lopez, M.
af48cf53-b65a-4bf7-91ec-dbbd96d6c6ae
de Sousa, N.
681998d3-5727-45b6-ac7e-ba32c1122814
Garcia-Martin, A.
ba0b3537-09a2-4272-a977-ce97d9c6ebb7
Gardes, F.Y.
7a49fc6d-dade-4099-b016-c60737cb5bb2
Sapienza, R.
8e976a38-1312-4dff-a02b-143d7d947c95
Castro-Lopez, M.
af48cf53-b65a-4bf7-91ec-dbbd96d6c6ae
de Sousa, N.
681998d3-5727-45b6-ac7e-ba32c1122814
Garcia-Martin, A.
ba0b3537-09a2-4272-a977-ce97d9c6ebb7
Gardes, F.Y.
7a49fc6d-dade-4099-b016-c60737cb5bb2
Sapienza, R.
8e976a38-1312-4dff-a02b-143d7d947c95

Castro-Lopez, M., de Sousa, N., Garcia-Martin, A., Gardes, F.Y. and Sapienza, R. (2015) Scattering of a plasmonic nanoantenna embedded in a silicon waveguide. Optics Express, 23 (22), 28108-28118. (doi:10.1364/OE.23.028108).

Record type: Article

Abstract

Plasmonic antennas integrated on silicon devices have large and yet unexplored potential for controlling and routing light signals. Here, we present theoretical calculations of a hybrid silicon-metallic system in which a single gold nanoantenna embedded in a single-mode silicon waveguide acts as a resonance-driven filter. As a consequence of scattering and interference, when the resonance condition of the antenna is met, the transmission drops by 85% in the resonant frequency band. Firstly, we study analytically the interaction between the propagating mode and the antenna by including radiative corrections to the scattering process and the polarization of the waveguide walls. Secondly, we find the configuration of maximum interaction and numerically simulate a realistic nanoantenna in a silicon waveguide. The numerical calculations show a large suppression of transmission and three times more scattering than absorption, consequent with the analytical model. The system we propose can be easily fabricated by standard silicon and plasmonic lithographic methods, making it promising as real component in future optoelectronic circuits.

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Published date: 19 October 2015

Identifiers

Local EPrints ID: 442841
URI: http://eprints.soton.ac.uk/id/eprint/442841
ISSN: 1094-4087
PURE UUID: 60680fa1-6644-4862-b809-1df723ccb764

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Date deposited: 28 Jul 2020 16:43
Last modified: 12 Oct 2020 16:34

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