Harmonic quantum cascade laser terahertz frequency combs enabled by multilayer graphene top-cavity scatters

Optical frequency comb synthesizers, operating in the harmonic regime, are metrological sources in which the emitted optical power is concentrated in a few modes, spaced by several multiples of the cavity free spectral range (FSR). This behavior reflects in a large correlation degree and, in princip...

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Bibliographic Details
Published inNanophotonics (Berlin, Germany) Vol. 13; no. 10; pp. 1835 - 1841
Main Authors Justo Guerrero, Manuel Alejandro, Arif, Omer, Sorba, Lucia, Vitiello, Miriam Serena
Format Journal Article
LanguageEnglish
Published Berlin De Gruyter 29.04.2024
Walter de Gruyter GmbH
Subjects
Electric fields
Graphene
harmonic frequency combs
Hydrofluorocarbons
Lasers
Multilayers
Optical frequency
Quantum cascade lasers
quantum optics
Simulation
Synthesizers
terahertz
Terahertz frequencies
Waveguides
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Summary:Optical frequency comb synthesizers, operating in the harmonic regime, are metrological sources in which the emitted optical power is concentrated in a few modes, spaced by several multiples of the cavity free spectral range (FSR). This behavior reflects in a large correlation degree and, in principle, in an increased optical power per mode. In miniaturized quantum cascade lasers (QCLs), harmonic frequency combs (HFCs) are hence particularly attracting to explore quantum correlation effects between adjacent harmonic modes, enabled by the inherently large gain media third-order Kerr nonlinearity, even if controlled generation of stable HFCs of predefined order, is typically demanding in such electrically pumped sources. Here, we demonstrate stable 2 order and 3 order HFC emission in terahertz frequency QCLs by respectively patterning an individual or a couple of equally spaced distributed multilayer graphene absorbers on the top metallic waveguides.
ISSN:2192-8614
2192-8606
2192-8614
DOI:10.1515/nanoph-2023-0912