Benchmarking the use of heavily-doped Ge for plasmonics and sensing in the mid-infrared

Pellegrini, G., Baldassarre, L., Giliberti, V., Frigerio, J., Gallacher, K., Paul, D. J. , Isella, G., Ortolani, M. and Biagioni, P. (2018) Benchmarking the use of heavily-doped Ge for plasmonics and sensing in the mid-infrared. ACS Photonics, 5(9), pp. 3601-3607. (doi:10.1021/acsphotonics.8b00438)

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Abstract

Despite the recent introduction of heavily-doped semiconductors for mid-infrared plasmonics, it still remains an open issue whether such materials can compete with noble metals. A whole set of figures of merit is employed to thoroughly assess the use of heavily-doped Ge on Si as a mid-infrared plasmonic material and benchmark it against standard noble metals such as Au. A full-wave electrodynamics framework is used to model and design high-performance, silicon foundry compatible mid-infrared plasmonic sensors based on experimental material data reaching plasma wavelengths down to λp ~ 3.1 μm. It is finally shown that Ge sensors can provide signal enhancements for vibrational spectroscopy above the 3 orders of magnitude, thus representing a promising alternative to noble metals, leveraging the full compatibility with the silicon foundry microfabrication processes.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Gallacher, Dr Kevin and Paul, Professor Douglas
Authors: Pellegrini, G., Baldassarre, L., Giliberti, V., Frigerio, J., Gallacher, K., Paul, D. J., Isella, G., Ortolani, M., and Biagioni, P.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:ACS Photonics
Publisher:American Chemical Society
ISSN:2330-4022
ISSN (Online):2330-4022
Published Online:25 July 2018
Copyright Holders:Copyright © 2018 American Chemical Society
First Published:First published in ACS Photonics 5(9):3601-3607
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
634451GEMINIDouglas PaulEuropean Commission (EC)613055ENG - ENGINEERING ELECTRONICS & NANO ENG