Electronically tunable aperiodic distributed feedback terahertz lasers

O. P. Marshall; S. Chakraborty; Md Khairuzzaman; T. Folland; A. Gholinia; H. E. Beere; D. A. Ritchie

doi:10.1063/1.4807636

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Electronically tunable aperiodic distributed feedback terahertz lasers

O. P. Marshall, S. Chakraborty, Md Khairuzzaman, T. Folland, A. Gholinia, H. E. Beere and D. A. Ritchie

Journal of applied physics, Vol.113(20), p.203103

05/28/2013

DOI: 10.1063/1.4807636

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Abstract

Focussed ion beam milling can be used to introduce aperiodic distributed feedback (ADFB) gratings into fully packaged, operational terahertz (THZ) quantum cascade lasers to achieve electronically controlled, discretely tunable laser emission. These aperiodic gratings-designed using computer-generated hologram techniques-consist of multiple slits in the surface plasmon waveguide, distributed along the length of the laser cavity. Tuning behaviour and output power in ADFB lasers operating around 2.9 THz are investigated with a variety of slit dimensions and grating scales. Mode selectivity and grating losses are found to be strongly dependent on milling depth into the upper waveguide layers, dramatically increasing as the metallic layers are penetrated, then rising more slowly with deeper milling into the laser active region. Grating scale and placement along the laser cavity length are also shown to influence mode selection. (C) 2013 AIP Publishing LLC.

Physical Sciences

Physics

Physics, Applied

Science & Technology

Details

Title: Subtitle: Electronically tunable aperiodic distributed feedback terahertz lasers
Creators: O. P. Marshall - University of Manchester
S. Chakraborty - University of Manchester
Md Khairuzzaman - University of Manchester
T. Folland - University of Manchester
A. Gholinia - University of Manchester
H. E. Beere - University of Cambridge
D. A. Ritchie - University of Cambridge
Resource Type: Journal article
Publication Details: Journal of applied physics, Vol.113(20), p.203103
DOI: 10.1063/1.4807636
ISSN: 0021-8979
eISSN: 1089-7550
Publisher: Amer Inst Physics
Number of pages: 8
Grant note: EP/J017671/1 / EPSRC; UK Research & Innovation (UKRI); Engineering & Physical Sciences Research Council (EPSRC) EP/G064504/1 / EPSRC; UK Research & Innovation (UKRI); Engineering & Physical Sciences Research Council (EPSRC) HMGCC EP/G064504/1 / Engineering and Physical Sciences Research Council; UK Research & Innovation (UKRI); Engineering & Physical Sciences Research Council (EPSRC)
Language: English
Date published: 05/28/2013
Academic Unit: Physics and Astronomy
Record Identifier: 9984429034802771

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