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Field-enhancing tapered planarized waveguides for THz quantum cascade laser frequency combs

Authors :
Senica Urban
Forrer Andres
Olariu Tudor
Micheletti Paolo
Cibella Sara
Torrioli Guido
Beck Mattias
Faist Jérôme
Scalari Giacomo
Source :
EPJ Web of Conferences, Vol 266, p 09007 (2022)
Publication Year :
2022
Publisher :
EDP Sciences, 2022.

Abstract

We present a new planarized waveguide geometry for THz quantum cascade laser frequency combs with improved waveguide losses, RF and thermal dissipation properties. Ridge devices display broadband free-running comb states, and the THz emission can be further broadened by RF injection. Tapered waveguide devices feature a strong field-enhancement effect, which results in an improved comb performance. This includes free-running comb states with strong single beatnotes up to nearly -30 dBm at 90 K, almost three orders of magnitude stronger than for ridge devices. Improved comb operation is maintained also for high operating temperatures, up to 115 K.

Subjects

Subjects :
Physics
QC1-999

Details

Language :
English
ISSN :
2100014X
Volume :
266
Database :
Directory of Open Access Journals
Journal :
EPJ Web of Conferences
Publication Type :
Academic Journal
Accession number :
edsdoj.80482e746bf844cc86c239cb693faee6
Document Type :
article
Full Text :
https://doi.org/10.1051/epjconf/202226609007