Search
Results
-
Ultrastrong Light-Matter Coupling with a single THz Split Ring Resonator and monolayer graphene
(2023)Bulletin of the American Physical SocietyGetting a better understanding of ultrastrong light matter interaction is not only interesting regarding fundamental research, but also relevant to gain insights on new properties of matter, possible new different phase transitions, and for applications in Quantum Information Processing. For all these purposes, it is most beneficial to study the interaction at a single electron level. Moving towards the single electron regime, we ...Other Conference Item -
Surface-emitting planarized THz quanum cascade laser frequency combs with inverse-designed waveguide facets
(2023)Proceedings of SPIE ~ Quantum Sensing and Nano Electronics and Photonics XIXWe present a high-performance planarized waveguide THz quantum cascade laser frequency comb, where an inverse-designed active waveguide front facet with a reduced reflectivity is coupled to a patch array antenna, and all the components are optimized for an octave-spanning emission spectrum (2-4 THz). Broadband frequency comb states spanning over 800 GHz with a single narrow RF beatnote up to -50 dBm are measured at 20 K. The slope efficiency ...Other Conference Item -
Frequency comb operation of antenna coupled terahertz quantum cascade ring lasers
(2023)Proceedings of SPIE ~ Quantum Sensing and Nano Electronics and Photonics XIXOther Conference Item -
THz optical beatnote detection with a fast hot electron bolometer operating up to 31 GHz
(2023)Proceedings of SPIE ~ Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XVIWe studied the performance of hot-electron bolometers (HEBs) operating at THz optical frequencies based on superconducting niobium nitride films. We report on large optical bandwidth measurement of the voltage response of the detector carried out with different THz sources. We show that the impulse response of the fully packaged HEB at 7.5 K has a 3 dB cut-off around 2 GHz, but a considerable detection capability is also observed above ...Other Conference Item -
Modifying the integer quantum Hall effect with cavity vacuum fields
(2023)Bulletin of the American Physical SocietyOther Conference Item -
Rotational Fourier-Transform Mid-IR spectroscopy with a Quantum Cas- cade Laser frequency comb
(2023)2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)Real-time spectroscopy with simultaneous high speed, high spectral resolution, and broad bandwidth is of vital importance for studying non-repetitive reactions and process monitoring [1]. The general purpose instrument for infrared spectroscopy has been Fourier-Transform infrared (FTIR) spectroscopy, due to its flexibility brought by extremely broad-band globar sources. While state-of-the-art rapid-scan FTIR can reach time resolutions of ...Other Conference Item -
THz optical solitons in planarized quantum cascade double ring lasers
(2023)2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)Quantum Cascade Lasers (QCL) based on cicular cavities are rapidly progressing as possible sources pf optical solitons [1], [2]. We report soliton formation in dispersion compensated THz ring QCLs [1]. The laser cavity consists of two concentric double metal ring waveguides, designed to support a symmetric and anti-symmetric super-mode where the global GVD is respectively enhanced or decreased [3](Fig. 1 a-b). The two super-modes feature ...Other Conference Item -
Comb formation in ring Quantum Cascade Lasers under radio-frequency injection
(2023)2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)On-chip frequency combs have drawn increasing attention due to their wide possible range of applications in spectroscopy and the intriguing mechanisms that govern their formation [1]. In the molecular fingerprint region of the mid-infrared, Quantum Cascade Lasers (QCLs) provide a flexible platform for developing such combs with high output powers, small device footprints and extensive spectral coverage [2]. However, in the established ...Other Conference Item -
Surface-Emitting Broadband THz Quantum Cascade Laser Frequency Combs with Inverse-Designed Waveguide Facets
(2023)2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)THz Quantum Cascade Lasers are unipolar electrically driven semiconductor lasers that can also operate as frequency combs for broadband metrology and sensing [1], [2]. THz quantum cascade lasers are usually processed in double metal waveguide ridges exhibiting low slope efficiencies and a patterned far field [3]. Surrounding the ridge structure with the low-loss polymer Benzocyclobuten (BCB) allows for an extended top contact improving ...Other Conference Item -
Two frequency-modulated comb regimes in quantum cascade laser rings
(2023)2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)The unique nature of the gain mechanisms in quantum cascade lasers (QCL) facilitates frequency comb generation without external nonlinear cavities, enabling simple on-chip spectroscopy devices in the mid-IR and THz frequencies [1]. QCLs are extremely important in the molecular fingerprint region of the mid-infrared, where they allow a flexible platform for developing frequency-combs with small device footprints with sufficient output power ...Other Conference Item