Distributed feedback terahertz frequency quantum cascade lasers with dual periodicity gratings

Journal Article · Mon Jan 05 00:00:00 EST 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4905338· OSTI ID:22395633

Castellano, F.; Zanotto, S.; Pitanti, A.; Li, L. H.; Linfield, E. H.; Davies, A. G. ^[1]; Tredicucci, A. ^[2]

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1. School of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT (United Kingdom)
2. Dipartimento di Fisica, Università di Pisa, Largo Pontecorvo 3 and NEST, CNR - Istituto Nanoscienze, 56127 Pisa (Italy)

We have developed terahertz frequency quantum cascade lasers that exploit a double-periodicity distributed feedback grating to control the emission frequency and the output beam direction independently. The spatial refractive index modulation of the gratings necessary to provide optical feedback at a fixed frequency, and simultaneously, a far-field emission pattern centered at controlled angles, was designed through use of an appropriate wavevector scattering model. Single mode terahertz (THz) emission at angles tuned by design between 0° and 50° was realized, leading to an original phase-matching approach for highly collimated THz quantum cascade lasers.

• OSTI ID: 22395633
• Journal Information: Applied Physics Letters, Vol. 106, Issue 1; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DESIGN
FEEDBACK
FIELD EMISSION
GRATINGS
LASERS
MODULATION
PERIODICITY
REFRACTIVE INDEX
SCATTERING
THZ RANGE