Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7691121 | Vibrational Spectroscopy | 2016 | 5 Pages |
Abstract
Brighter and more efficient light sources are desired to further increase the sensitivity of spectroscopic measurements. Simultaneously, a strong trend towards miniaturization and compactness is ubiquitous. In the last years quantum cascade lasers have become powerful and reliable tools for infrared spectroscopy. We report on ring quantum cascade lasers with two distinct features which increase the efficiency of these devices and provide enhanced performance for spectroscopic applications. First, the distributed feedback grating exhibits two Ϭ-phase shifts. This provides far fields with a central intensity maximum. Second, a gradient index metamaterial is fabricated into the substrate. This collimates the emitted light and can replace external optics.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Rolf Szedlak, Martin Holzbauer, Peter Reininger, Donald MacFarland, Tobias Zederbauer, Hermann Detz, Aaron Maxwell Andrews, Werner Schrenk, Gottfried Strasser,