Quantum cascade laser integration on silicon-based waveguide circuits
Integrated lasers and LEDs ,
Mid IR silicon photonics ,
Heterogeneous integration technology for silicon photonics ,
Silicon photonics for lab-on-chip spectroscopy
Main Researcher: Gunther Roelkens
Quantum cascade lasers (QCLs) have enabled the generation of mid-ir light (3 – 12 µm) using epitaxially grown semiconductors. These lasers emit light because of transitions between energy levels inside the conduction band itself unlike traditional semiconductor lasers which emit light due to transitions between the conduction band and valence band. Integration of QCLs with silicon-based waveguide circuits allow the realization of compact hand held systems which can be used for sensing applications. However this integration varies significantly from the heterogeneous integration scheme using BCB bonding used in the telecom wavelength range as BCB absorbs heavily in mid-ir. Therefore, butt coupling of the QCL and the photonic chip has to be carried out using flip chip integration. Also since QCLs are power hungry devices, this integration scheme will provide efficient heat sinking and will thus ensure CW room temperature operation.
A schematic below shows a QCL integrated with a wavelength selective feedback circuit present on a photonic chip. This could be useful in realization of an integrated tunable QCL, which could replace the presently available EC-QCLs which use a moving grating for feedback.
Other people involved:
PublicationsBack to overview
S. Radosavljevic, N. Teigell Beneitez, A. Katumba, M. Muneeb, M. Vanslembrouck, B. Kuyken, G. Roelkens,
A mid-infrared Vernier racetrack resonator tunable filter implemented on a Germanium on SOI waveguide platform, Optical Materials Express (invited), 8(4), p.824-835 doi:10.1364/ome.8.000824 (2018) .
S. Radosavljevic, B. Kuyken, G. Roelkens,
Efficient 5.2 um wavelength fiber-to-chip grating couplers for the Ge-on-Si and Ge-on-SOI mid-infrared waveguide platform, Optics Express, 25(16), p.19034 - 19043 doi:10.1364/oe.25.019034 (2017) .
A. Malik, S. Dwivedi, L. Van Landschoot, M. Muneeb, Y. Shimura, G. Lepage, J. Van Campenhout, W. Vanherle, T. Van Opstal, R. Loo, G. Roelkens,
Ge-on-Si and Ge-on-SOI thermo-optic phase shifters for the mid-infrared, Optics Express, 22(23), p.28479-28488 doi:10.1364/OE.22.028479 (2014) .
J.S.Penades, Y.Hu, M.Nedeljkovic, C. G. Littlejohns, A. Z. Khokhar, A. Malik, G. Roelkens, F. Y. Gardes, G. Z. Mashanovich,
Angled MMI CWDM structure on Germanium on Silicon, 2015 Conference on Lasers and Electro-optics Europe & European Quantum Electronics Conference (CLEO Europe), Germany, p.paper CK-7.2 TUE (2015) .