A flexible terahertz waveguide for delivery and filtering of quantum-cascade laser radiation

We demonstrate that a specially designed microstructured polymer waveguide can improve the quality of quantum cascade laser radiation. It can filter out undesired side frequencies and transform the delivered radiation to a sub-millimeter size beam with a Gaussian-like cross-section. The spatial dist...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Applied physics letters 2018-09, Vol.113 (13)
Hauptverfasser: Nazarov, Maxim, Shilov, Artur, Margushev, Zaur, Bzheumikhov, Kazbek, Ozheredov, Ilya, Angeluts, Andrew, Sotsky, Alexander, Shkurinov, Alexander
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:We demonstrate that a specially designed microstructured polymer waveguide can improve the quality of quantum cascade laser radiation. It can filter out undesired side frequencies and transform the delivered radiation to a sub-millimeter size beam with a Gaussian-like cross-section. The spatial distribution of the bended waveguide mode is measured, and low bending losses of the fundamental mode are confirmed. Detailed optimization of a capillary structure for 3 THz frequency allows delivering single frequency radiation up to a 1 meter distance. The results of the experimental study are confirmed by calculations with an accurate mode solver that explains the achieved losses of ∼10 dB/m. A further improvement strategy is suggested.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.5040306