Universität zu Köln

Justen, Matthias, Bonzon, Christopher, Ohtani, Keita, Beck, Mathias, Graf, Urs and Faist, Jerome ORCID: 0000-0003-4429-7988 (2016). 2D patch antenna array on a double metal quantum cascade laser with >90% coupling to a Gaussian beam and selectable facet transparency at 1.9 THz. Opt. Lett., 41 (19). S. 4590 - 4593. WASHINGTON: OPTICAL SOC AMER. ISSN 1539-4794

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Abstract

2 x 2 parallel fed and 3 x 3 serial fed patch antenna arrays on a benzocyclobutene (BCB) polymer layer are integrated with a 70 mu m wide, dry etched, double metal waveguide quantum cascade laser, operating at about 1.9 THz. The BCB surrounds the quantum cascade laser ridge and is planarized to fit precisely its height. The patch antenna arrays emit a linearly polarized, highly symmetric beam perpendicular to the antenna plane. The beams have a FWHM angle of 49 degrees (2 x 2) and 35 degrees (3 x 3). Both measurements and simulations indicate coupling factors to a Gaussian beam of over 90%. The antenna design is strongly governed by the high thickness (h = 13.6 mu m) and the low dielectric constant (epsilon(r) = 2.45) of the BCB substrate. Because the patch array has a very low input reflectivity of -13 to -20 dB over the 1.7-2.1 THz operation band, the laser needs a partially transmitting reflector to maintain the Q-factor of the active medium resonator to assure lasing in the antennas operation band. By changing the dimensions of the reflector, the facet transparency can be designed in a wide range from fully transmissive to highly reflective. (C) 2016 Optical Society of America

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Justen, Matthias UNSPECIFIED UNSPECIFIED UNSPECIFIED Bonzon, Christopher UNSPECIFIED UNSPECIFIED UNSPECIFIED Ohtani, Keita UNSPECIFIED UNSPECIFIED UNSPECIFIED Beck, Mathias UNSPECIFIED UNSPECIFIED UNSPECIFIED Graf, Urs UNSPECIFIED UNSPECIFIED UNSPECIFIED Faist, Jerome UNSPECIFIED orcid.org/0000-0003-4429-7988 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-260974
DOI:	10.1364/OL.41.004590
Journal or Publication Title:	Opt. Lett.
Volume:	41
Number:	19
Page Range:	S. 4590 - 4593
Date:	2016
Publisher:	OPTICAL SOC AMER
Place of Publication:	WASHINGTON
ISSN:	1539-4794
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language Optics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/26097