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Authors = Gottfried Strasser ORCID = 0000-0003-0147-0883

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9 pages, 4556 KiB  
Article
Enhanced Crystal Quality of AlxIn1-xAsySb1-y for Terahertz Quantum Cascade Lasers
by Tobias Zederbauer, Aaron Maxwell Andrews, Donald MacFarland, Hermann Detz, Werner Schrenk and Gottfried Strasser
Photonics 2016, 3(2), 20; https://doi.org/10.3390/photonics3020020 - 20 Apr 2016
Cited by 9 | Viewed by 5027
Abstract
This work provides a detailed study on the growth of AlxIn1-xAsySb1-y lattice-matched to InAs by Molecular Beam Epitaxy. In order to find the conditions which lead to high crystal quality deep within the miscibility gap, Al [...] Read more.
This work provides a detailed study on the growth of AlxIn1-xAsySb1-y lattice-matched to InAs by Molecular Beam Epitaxy. In order to find the conditions which lead to high crystal quality deep within the miscibility gap, AlxIn1-xAsySb1-y with x = 0.462 was grown at different growth temperatures as well as As2 and Sb2 beam equivalent pressures. The crystal quality of the grown layers was examined by high-resolution X-ray diffraction and atomic force microscopy. It was found that the incorporation of Sb into Al0.462In0.538AsySb1-y is strongly temperature-dependent and reduced growth temperatures are necessary in order to achieve significant Sb mole fractions in the grown layers. At 480 ∘ C lattice matching to InAs could not be achieved. At 410 ∘ C lattice matching was possible and high quality films of Al0.462In0.538AsySb1-y were obtained. Full article
(This article belongs to the Special Issue Quantum Cascade Lasers - Advances and New Applications)
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10 pages, 356 KiB  
Article
Monolithically Integrated Mid-Infrared Quantum Cascade Laser and Detector
by Benedikt Schwarz, Peter Reininger, Hermann Detz, Tobias Zederbauer, Aaron Maxwell Andrews, Werner Schrenk and Gottfried Strasser
Sensors 2013, 13(2), 2196-2205; https://doi.org/10.3390/s130202196 - 6 Feb 2013
Cited by 38 | Viewed by 11031
Abstract
We demonstrate the monolithic integration of a mid-infrared laser and detector utilizing a bi-functional quantum cascade active region. When biased, this active region provides optical gain, while it can be used as a detector at zero bias. With our novel approach we can [...] Read more.
We demonstrate the monolithic integration of a mid-infrared laser and detector utilizing a bi-functional quantum cascade active region. When biased, this active region provides optical gain, while it can be used as a detector at zero bias. With our novel approach we can measure the light intensity of the laser on the same chip without the need of external lenses or detectors. Based on a bound-to-continuum design, the bi-functional active region has an inherent broad electro-luminescence spectrum of 200 cm-1, which indicates its use for single mode laser arrays. We have measured a peak signal of 191.5 mV at the on-chip detector, without any amplification. The room-temperature pulsed emission with an averaged power consumption of 4 mW and the high-speed detection makes these devices ideal for low-power sensors. The combination of the on-chip detection functionality, the broad emission spectrum and the low average power consumption indicates the potential of our bi-functional quantum cascade structures to build a mid-infrared lab-on-a-chip based on quantum cascade laser technology. Full article
(This article belongs to the Special Issue Laser Sensing and Imaging)
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12 pages, 2974 KiB  
Article
Terahertz Active Photonic Crystals for Condensed Gas Sensing
by Alexander Benz, Christoph Deutsch, Martin Brandstetter, Aaron M. Andrews, Pavel Klang, Hermann Detz, Werner Schrenk, Gottfried Strasser and Karl Unterrainer
Sensors 2011, 11(6), 6003-6014; https://doi.org/10.3390/s110606003 - 3 Jun 2011
Cited by 38 | Viewed by 10295
Abstract
The terahertz (THz) spectral region, covering frequencies from 1 to 10 THz, is highly interesting for chemical sensing. The energy of rotational and vibrational transitions of molecules lies within this frequency range. Therefore, chemical fingerprints can be derived, allowing for a simple detection [...] Read more.
The terahertz (THz) spectral region, covering frequencies from 1 to 10 THz, is highly interesting for chemical sensing. The energy of rotational and vibrational transitions of molecules lies within this frequency range. Therefore, chemical fingerprints can be derived, allowing for a simple detection scheme. Here, we present an optical sensor based on active photonic crystals (PhCs), i.e., the pillars are fabricated directly from an active THz quantum-cascade laser medium. The individual pillars are pumped electrically leading to laser emission at cryogenic temperatures. There is no need to couple light into the resonant structure because the PhC itself is used as the light source. An injected gas changes the resonance condition of the PhC and thereby the laser emission frequency. We achieve an experimental frequency shift of 10−3 times the center lasing frequency. The minimum detectable refractive index change is 1.6 × 10−5 RIU. Full article
(This article belongs to the Section Physical Sensors)
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