Midinfrared plasmon-enhanced spectroscopy with germanium antennas on silicon substrates

Baldassarre, L., Sakat, E., Frigerio, J., Samarelli, A., Gallacher, K., Calandrini, E., Isella, G., Paul, D. J. , Ortolani, M. and Biagioni, P. (2015) Midinfrared plasmon-enhanced spectroscopy with germanium antennas on silicon substrates. Nano Letters, 15(11), pp. 7225-7231. (doi:10.1021/acs.nanolett.5b03247) (PMID:26457387)

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Abstract

Midinfrared plasmonic sensing allows the direct targeting of unique vibrational fingerprints of molecules. While gold has been used almost exclusively so far, recent research has focused on semiconductors with the potential to revolutionize plasmonic devices. We fabricate antennas out of heavily doped Ge films epitaxially grown on Si wafers and demonstrate up to 2 orders of magnitude signal enhancement for the molecules located in the antenna hot spots compared to those located on a bare silicon substrate. Our results set a new path toward integration of plasmonic sensors with the ubiquitous CMOS platform.

Item Type:Articles (Letter)
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Paul, Professor Douglas and Gallacher, Dr Kevin
Authors: Baldassarre, L., Sakat, E., Frigerio, J., Samarelli, A., Gallacher, K., Calandrini, E., Isella, G., Paul, D. J., Ortolani, M., and Biagioni, P.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Research Group:Semiconductor Devices
Journal Name:Nano Letters
Publisher:American Chemical Society
ISSN:1530-6984
ISSN (Online):1530-6992
Published Online:12 October 2015
Copyright Holders:Copyright © 2015 American Chemical Society
First Published:First published in Nano Letters 15(11):7225-7231
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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