Low loss Ge-on-Si waveguides operating in the 8–14 µm atmospheric transmission window

Gallacher, K., Millar, R.W., Griškevičiūte, U., Baldassarre, L., Sorel, M., Ortolani, M. and Paul, D.J. (2018) Low loss Ge-on-Si waveguides operating in the 8–14 µm atmospheric transmission window. Optics Express, 26(20), pp. 25667-25675. (doi:10.1364/OE.26.025667)

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Abstract

Germanium-on-silicon waveguides were modeled, fabricated and characterized at wavelengths ranging from 7.5 to 11 µm. Measured waveguide losses are below 5 dB/cm for both TE and TM polarization and reach values of ∼ 1 dB/cm for ≥ 10 µm wavelengths for the TE polarization. This work demonstrates experimentally for the first time that Ge-on-Si is a viable waveguide platform for sensing in the molecular fingerprint spectral region. Detailed modeling and analysis is presented to identify the various loss contributions, showing that with practical techniques losses below 1 dB/cm could be achieved across the full measurement range.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Griskeviciute, Ms Ugne and Gallacher, Dr Kevin and Paul, Professor Douglas and Millar, Mr Ross and Sorel, Professor Marc
Authors: Gallacher, K., Millar, R.W., Griškevičiūte, U., Baldassarre, L., Sorel, M., Ortolani, M., and Paul, D.J.
College/School:College of Science and Engineering > School of Engineering
College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Optics Express
Publisher:Optical Society of America
ISSN:1094-4087
ISSN (Online):1094-4087
Published Online:18 September 2018
Copyright Holders:Copyright © 2018 The Optical Society
First Published:First published in Optics Express 26(20): 25667-25675
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
694301Engineering Quantum Technology Systems on a Silicon PlatformDouglas PaulEngineering and Physical Sciences Research Council (EPSRC)EP/N003225/1ENG - ENGINEERING ELECTRONICS & NANO ENG