Hollow metallic waveguides integrated with terahertz quantum cascade lasers

Degl’Innocenti, R., Shah, Y.D. , Jessop, D.S., Ren, Y., Mitrofanov, O., Beere, H.E. and Ritchie, D.A. (2014) Hollow metallic waveguides integrated with terahertz quantum cascade lasers. Optics Express, 22(20), pp. 24439-24449. (doi:10.1364/OE.22.024439) (PMID:25322020)

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We present the realization of a compact, monolithically integrated arrangement of terahertz quantum cascade lasers with hollow metallic cylindrical waveguides. By directly mounting a copper pipe to the end facet of a double metal waveguide, it was possible to significantly improve the far field emission from such a sub-wavelength plasmonic mode, while preserving the characteristic performance of the laser. Careful alignment of the quantum cascade laser and the hollow waveguide is required in order to prevent the excitation of higher order/mixed modes as predicted with a high degree of accuracy by a theoretical model. Finally, this approach proved to be a superior method of beam shaping when compared to other in situ arrangements, such as a silicon hyper-hemispherical lens glued to the facet, which are presented.

Item Type:Articles
Additional Information:The authors acknowledge financial support from the Engineering and Physical Sciences Research Council (grant number EP/J017671/1, COherent Terahertz Systems).
Glasgow Author(s) Enlighten ID:Shah, Dr Yash Diptesh
Authors: Degl’Innocenti, R., Shah, Y.D., Jessop, D.S., Ren, Y., Mitrofanov, O., Beere, H.E., and Ritchie, D.A.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Optics Express
Publisher:Optical Society of America
ISSN (Online):1094-4087
Copyright Holders:Copyright © 2015 Optical Society of America
First Published:First published in Optics Express 22(20):24439-24449
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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