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

doi:10.1117/12.3000338

13 March 2024 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

Author Affiliations +

Proceedings Volume PC12905, Novel In-Plane Semiconductor Lasers XXIII; PC129050I (2024) https://doi.org/10.1117/12.3000338
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

We will present new developments in THz coherent photonics enabled by a recently demonstrated broadband planarized platform based on quantum cascade gain medium. The possibility to integrate onto the same chip active (lasers, detectors, amplifiers) and passive (waveguides, splitters, antennas, chirped mirrors,) photonic elements results extremely attractive, naturally bridging microwaves to THz waves. Such approach allows the adoption of advanced photonics design techniques (inverse design) to tailor facet reflectivities in double metal, subwavelength waveguides. We will present frequency combs exceeding 1 THz bandwidth, operating above liquid nitrogen temperature, with regular far fields and vertical emission. We will as well discuss laser dynamics engineering exploiting extreme field confinement in narrow waveguides, clearly demonstrating FM comb operation in THz QCLs. By exploiting dispersion compensation in planarized double ring cavities we will finally present the achievement of dissipative Kerr solitons with pulses of 10 ps. The application of such waveguides to high-temperature active regions allows the operation of 4 THz QCLs on Peltier cooler with currents below 2.5 A

Conference Presentation

Citation Download Citation

Giacomo Scalari, Urban Senica, Paolo Micheletti, Sebastian Gloor, Sara Cibella, Guido Torrioli, Mattias Beck, and Jerome Faist "A broadband planarized platform for high performance THz quantum cascade photonics", Proc. SPIE PC12905, Novel In-Plane Semiconductor Lasers XXIII, PC129050I (13 March 2024); https://doi.org/10.1117/12.3000338

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