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Resonant Amplification Enhanced Terahertz Quantum Cascade Detection
(2021)2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)The photon-driven nature of the transport in terahertz quantum cascade laser can be exploited to detect light. Fast tunable detectors are demonstrated with responsivities higher than 17 V/W. Preliminary measurements shows that, thanks to the sub-ps intersubband lifetime, electrical bandwidths larger than 5 GHz can be obtained.Conference Paper -
Y-coupled planarized waveguide THz quantum cascade laser frequency comb
(2021)2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)We present a Y-coupled planarized double metal waveguide THz quantum cascade laser, featuring a low threshold current, broadband THz emission and operation as a frequency comb. Far-field measurements produce characteristic interference patterns, a signature of broadband phase locking and equal power splitting between the two Y-split waveguide arms.Conference Paper -
THz Quantum Cascade Laser Frequency Comb based on a Y-coupled Planarized Waveguide
(2021)2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)Terahertz (THz) quantum cascade lasers (QCLs) can operate as frequency combs [1] and dual combs [2] , making them very appealing for spectroscopy and metrology applications. Recently, Y-split THz QCLs were investigated in the context of tunable single mode operation [3] . Here, we present a Y-coupled double metal planarized waveguide geometry to study broadband phase locking and frequency comb formation.Other Conference Item -
Planarized waveguides for high-performance THz quantum cascade laser frequency
(2022)Proceedings of SPIE ~ Quantum Sensing and Nano Electronics and Photonics XVIIIWe present a planarized double metal waveguide THz quantum cascade laser, where the top contact metallization extends beyond the active region, above the surrounding low-loss BCB polymer. Placing wire bonds over the BCB-covered area enables the fabrication of extremely narrow waveguide dimensions with reduced power dissipation. Compared to a standard double metal waveguide, improvements in waveguide losses, dispersion, RF and thermal ...Other Conference Item -
Field-enhancing tapered planarized waveguides for THz quantum cascade laser frequency combs
(2022)EPJ Web of Conferences ~ EOS Annual Meeting (EOSAM 2022)We present a new planarized waveguide geometry for THz quantum cascade laser frequency combs with improved waveguide losses, RF and thermal dissipation properties. Ridge devices display broadband free-running comb states, and the THz emission can be further broadened by RF injection. Tapered waveguide devices feature a strong field-enhancement effect, which results in an improved comb performance. This includes free-running comb states ...Other Conference Item -
Post-processing GHz-level frequency tuning of THz Quantum Cascade Lasers
(2020)2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)Frequency red tuning down to GHz-level is shown in THz Quantum Cascade Lasers, by post-processing alteration of the device. Changing the height difference between the active region and surrounding material (and reapplying a material of known refractive index with appropriate thickness), the mode effective refractive index is increased, causing the device to lase at a lower frequency.Conference Paper -
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1.65 THz Spanning Homogeneous THz Quantum Cascade Laser: Comb Operation and Injection Locking
(2019)2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)Conference Paper -
A broadband polarization-rotating antipodal Vivaldi antenna for improved far-field properties of terahertz quantum cascade lasers
(2019)2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)Conference Paper