Mr. Paolo Micheletti Profile

Paolo Micheletti

at ETH Zurich

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Author

Publications (10)

Proceedings Article | 13 March 2024 Presentation

A broadband planarized platform for high performance THz quantum cascade photonics

Giacomo Scalari, Urban Senica, Paolo Micheletti, Sebastian Gloor, Sara Cibella, Guido Torrioli, Mattias Beck, Jerome Faist

Proceedings Volume PC12905, PC129050I (2024) https://doi.org/10.1117/12.3000338

KEYWORDS: Terahertz radiation, Quantum photonics, Waveguides, Quantum cascade lasers, Design and modelling, Solitons, Quantum confinement, Quantum coherence, Quantum chips, Picosecond phenomena

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Proceedings Article | 12 March 2024 Presentation

Optical beatnote detection of a portable THz QCL comb by direct microwave mixing onto an Hot-electron bolometer

Sara Cibella, Guido Torrioli, Paolo Micheletti, Urban Senica, Maria Gambelli, Pasquale Carelli, Ennio Giovine, Mattias Beck, Jerome Faist, Giacomo Scalari

Proceedings Volume PC12885, PC1288508 (2024) https://doi.org/10.1117/12.3002664

KEYWORDS: Terahertz radiation, Quantum cascade lasers, Quantum beats, Portability, Microwave radiation, Frequency combs, Bolometers, Signal detection, Quantum detection, Nanophotonics

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Proceedings Article | 17 March 2023 Presentation

Temporal properties od THz frequency combs quantum cascade lasers in ridge and ring resonators

Giacomo Scalari, Paolo Micheletti, Urban Senica, Andres Forrer, Sara Cibella, Guido Torrioli, Mattias Beck, Jerome Faist

Proceedings Volume PC12406, PC1240607 (2023) https://doi.org/10.1117/12.2659147

KEYWORDS: Terahertz radiation, Resonators, Quantum cascade lasers, Frequency combs, Frequency modulation, Fermium, Dispersion, Waveguides, Spectroscopes, Solitons

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Proceedings Article | 17 March 2023 Presentation

Surface-emitting planarized THz quantum cascade laser frequency combs with inverse-designed waveguide facets

Urban Senica, Sebastian Gloor, Paolo Micheletti, Mattias Beck, Jérôme Faist, Giacomo Scalari

Proceedings Volume PC12430, PC1243008 (2023) https://doi.org/10.1117/12.2650565

KEYWORDS: Waveguides, Terahertz radiation, Quantum cascade lasers, Frequency combs, Reflectivity, Polymers, Polymer multimode waveguides, Planar waveguides, Numerical simulations, Metals

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Proceedings Article | 17 March 2023 Presentation

Frequency comb operation of antenna coupled terahertz quantum cascade ring lasers

Paolo Micheletti, Urban Senica, Andres Forrer, Sara Cibella, Guido Torrioli, Mattias Beck, Jérôme Faist, Giacomo Scalari

Proceedings Volume PC12430, PC1243009 (2023) https://doi.org/10.1117/12.2649928

KEYWORDS: Quantum cascade lasers, Antennas, Frequency combs, Phase measurement, Waveguides, Solitons, Dispersion

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Proceedings Article | 17 March 2023 Presentation

Planarized THz quantum cascade lasers for broadband coherent photonics

Giacomo Scalari, Urban Senica, Paolo Micheletti, Andres Forrer, Sara Cibella, Guido Torrioli, Martin Franckié, Mattias Beck, Jérôme Faist

Proceedings Volume PC12440, PC124400P (2023) https://doi.org/10.1117/12.2648793

KEYWORDS: Terahertz radiation, Quantum cascade lasers, Photonics, Waveguides, Dispersion, Polymers, Polymer multimode waveguides, Planar waveguides, Picosecond phenomena, Passive elements

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Proceedings Article | 3 June 2022 Presentation

Planarized tapered waveguides for THz quantum cascade laser frequency combs

Urban Senica, Tudor Olariu, Andres Forrer, Paolo Micheletti, Mattias Beck, Jérôme Faist, Giacomo Scalari

Proceedings Volume PC12134, PC1213406 (2022) https://doi.org/10.1117/12.2626797

KEYWORDS: Waveguides, Terahertz radiation, Frequency combs, Quantum cascade lasers, Temperature metrology, Wave propagation, Standards development, Signal attenuation, Scattering, Polymers

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Terahertz (THz) quantum cascade lasers (QCLs) based on double metal waveguides are compact sources of broadband THz radiation, which can also operate as frequency combs. We present a planarized double metal waveguide THz QCL platform, where the active region is embedded in a low-loss BCB polymer and covered by an extended top metallization. The latter enables placing bonding wires on the sides above the BCB-covered area, hindering the formation of any defects on the active region and enables the fabrication of waveguides with narrow widths below the bonding wire size. This can then be employed as a fundamental mode selection mechanism for comb operation without any side absorbers, and also features improved heat dissipation properties in continuous wave operation. The extended top metallization also enhances the RF properties of the device, as it encompasses a metallic cavity with the global ground plane. Experimentally, we present results on two different device geometries. First is a simple ridge waveguide with a width of 40 μm, narrow enough to act as a mode selection filter. Free-running frequency comb states with bandwidths above 600 GHz and single beatnotes up to -60 dBm are measured. With a strong external RF signal, close to the natural repetition frequency, we can broaden the emission to over 1.4 THz. The second type of device is a tapered waveguide, where the narrow sections act as a transversal mode filter, while the wider ones have lower waveguide losses and provide more gain. Due to a field-enhancement effect in the narrow sections, there is a significant enhancement in the four wave mixing, a third order nonlinear process responsible for comb formation. Free-running devices produce beatnotes close to -30 dBm, three orders of magnitude higher than for ridge devices. Improved comb performance is maintained also for high operating temperatures. A comb bandwidth above 200 GHz and a single beatnote above -60 dBm are measured at 115 K, very close to the maximum lasing temperature of 118 K. Beyond the improved laser and comb performance, the planarized waveguide platform also enables a relatively straightforward co-integration of active and passive elements.

Proceedings Article | 1 April 2022 Presentation

Terahertz frequency combs from dispersion compensated and RF injection locked quantum cascade ring lasers

Paolo Micheletti, Urban Senica, Andres Forrer, Mattias Beck, Jérôme Faist, Giacomo Scalari

Proceedings Volume PC11987, PC1198701 (2022) https://doi.org/10.1117/12.2609479

KEYWORDS: Quantum cascade lasers, Frequency combs, Dispersion, Waveguides, Waveguide lasers, Wave propagation, Terahertz radiation, Solitons, RF coupling, Metals

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Proceedings Article | 9 March 2022 Presentation

THz QCL combs under strong RF injection: temporal dynamics and harmonic states

Giacomo Scalari, Andres Forrer, Urban Senica, Sara Cibella, Guido Torrioli, Paolo Micheletti, Mattias Beck, Jerome Faist

Proceedings Volume PC12021, PC120210B (2022) https://doi.org/10.1117/12.2606770

KEYWORDS: Terahertz radiation, Quantum cascade lasers, Waveguides, Modulation, RF coupling, Polymers, Picosecond phenomena, Mid-IR, Laser resonators, Frequency modulation

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Proceedings Article | 5 March 2021 Presentation

Coupled waveguide arrays for terahertz quantum cascade laser frequency combs

Urban Senica, Paolo Micheletti, Mattias Beck, Jérôme Faist, Giacomo Scalari

Proceedings Volume 11685, 116850O (2021) https://doi.org/10.1117/12.2578260

KEYWORDS: Terahertz radiation, Waveguides, Quantum cascade lasers, Frequency combs, RF coupling, Metals, Fabrication, Dry etching, Dispersion

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Showing 5 of 10 publications

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