Theoretical Analysis of Spectral Broadening Through Saturable Photoexcited-Carrier Refraction in Graphene-Covered Nanowires

We perform a thorough study of the spectral broadening of short and intense pulses propagating in graphene- covered nanowires departing from a saturable photoexcited-carrier refraction (SPCR) model. In particular, we put forth an analytical expression for the instantaneous frequency of the traversin...

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Bibliographic Details
Published in:IEEE journal of quantum electronics 2022-12, Vol.58 (6), p.1-5
Main Authors: Fierens, Pablo I., Hernandez, Santiago M., Linale, Nicolas, Grosz, Diego F.
Format: Article
Language:English
Subjects:
Analytical models
Chirp
Frequency shift
Graphene
Graphene-covered nanowires
Mathematical models
Nanowires
nonlinear optical pulse propagation
Optical pulses
Pulse propagation
Refraction
Silicon
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Summary:We perform a thorough study of the spectral broadening of short and intense pulses propagating in graphene- covered nanowires departing from a saturable photoexcited-carrier refraction (SPCR) model. In particular, we put forth an analytical expression for the instantaneous frequency of the traversing pulse, in a relevant limiting case, which allows to calculate the spectral broadening and frequency shift experienced by the pulse and elucidate the role of its initial chirp. Most interestingly, both the spectral broadening and frequency shift are found to be maximized for an optimal input power. In all cases, results from analytical expressions are found to be in excellent agreement with numerical solutions of the propagation equations.
ISSN:0018-9197
1558-1713
DOI:10.1109/JQE.2022.3205937