Ultra-broadband mid-infrared Ge-on-Si waveguide polarization rotator

Gallacher, K. , Millar, R. W. , Griskeviciute, U., Sinclair, M. , Sorel, M. , Baldassarre, L., Ortolani, M., Soref, R. and Paul, D. J. (2020) Ultra-broadband mid-infrared Ge-on-Si waveguide polarization rotator. APL Photonics, 5(2), 026102. (doi: 10.1063/1.5134973)

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The design, modeling, micro-fabrication, and characterization of an ultra-broadband Ge-on-Si waveguide polarization rotator are presented. The polarization rotator is based on the mode evolution approach where adiabatic symmetric and anti-symmetric tapers are utilized to convert from the fundamental transverse magnetic to electric mode. The device is shown to be extremely fabrication tolerant and simple to fabricate. The fabricated devices demonstrate a polarization extinction ratio of ≥15 dB over a 2 μm bandwidth (9–11 μm wavelength) with an average insertion loss of <1 dB, which is an order of magnitude improvement compared to previously demonstrated devices. This device will provide polarization flexibility when integrating quantum cascade lasers on-chip for mid-infrared waveguide molecular spectroscopy.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Millar, Dr Ross and Sinclair, Mr Martin and Sorel, Professor Marc and Hawley, Mrs Ugne and Paul, Professor Douglas and Gallacher, Dr Kevin
Authors: Gallacher, K., Millar, R. W., Griskeviciute, U., Sinclair, M., Sorel, M., Baldassarre, L., Ortolani, M., Soref, R., and Paul, D. J.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:APL Photonics
Publisher:AIP Publishing
ISSN (Online):2378-0967
Published Online:18 February 2020
Copyright Holders:Copyright © 2020 The Authors
First Published:First published in APL Photonics 5(2):026102
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
171911Engineering Quantum Technology Systems on a Silicon PlatformDouglas PaulEngineering and Physical Sciences Research Council (EPSRC)EP/N003225/1ENG - Electronics & Nanoscale Engineering
305161Germanium Tin Quantum DetectorsRoss MillarRoyal Academy of Engineering (RAE)RF/201819/18/187ENG - Electronics & Nanoscale Engineering