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Article

Second-Harmonic Generation in Suspended AlGaAs Waveguides: A Comparative Study

1
MPQ, Université de Paris & CNRS, 10 rue A. Domon et L. Duquet, 75013 Paris, France
2
C2N, CNRS, Université Paris-Saclay, 10 boulevard T. Gobert, 91120 Palaiseau, France
*
Author to whom correspondence should be addressed.
Micromachines 2020, 11(2), 229; https://doi.org/10.3390/mi11020229
Received: 30 December 2019 / Revised: 15 February 2020 / Accepted: 18 February 2020 / Published: 23 February 2020
(This article belongs to the Special Issue Nonlinear Photonics Devices)
Due to adjustable modal birefringence, suspended AlGaAs optical waveguides with submicron transverse sections can support phase-matched frequency mixing in the whole material transparency range, even close to the material bandgap, by tuning the width-to-height ratio. Furthermore, their single-pass conversion efficiency is potentially huge, thanks to the extreme confinement of the interacting modes in the highly nonlinear and high-refractive-index core, with scattering losses lower than in selectively oxidized or quasi-phase-matched AlGaAs waveguides. Here we compare the performances of two types of suspended waveguides made of this material, designed for second-harmonic generation (SHG) in the telecom range: (a) a nanowire suspended in air by lateral tethers and (b) an ultrathin nanorib, made of a strip lying on a suspended membrane of the same material. Both devices have been fabricated from a 123 nm thick AlGaAs epitaxial layer and tested in terms of SHG efficiency, injection and propagation losses. Our results point out that the nanorib waveguide, which benefits from a far better mechanical robustness, performs comparably to the fully suspended nanowire and is well-suited for liquid sensing applications. View Full-Text
Keywords: second-harmonic generation; waveguide; AlGaAs second-harmonic generation; waveguide; AlGaAs
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MDPI and ACS Style

Roland, I.; Ravaro, M.; Suffit, S.; Filloux, P.; Lemaître, A.; Favero, I.; Leo, G. Second-Harmonic Generation in Suspended AlGaAs Waveguides: A Comparative Study. Micromachines 2020, 11, 229. https://doi.org/10.3390/mi11020229

AMA Style

Roland I, Ravaro M, Suffit S, Filloux P, Lemaître A, Favero I, Leo G. Second-Harmonic Generation in Suspended AlGaAs Waveguides: A Comparative Study. Micromachines. 2020; 11(2):229. https://doi.org/10.3390/mi11020229

Chicago/Turabian Style

Roland, Iännis, Marco Ravaro, Stéphan Suffit, Pascal Filloux, Aristide Lemaître, Ivan Favero, and Giuseppe Leo. 2020. "Second-Harmonic Generation in Suspended AlGaAs Waveguides: A Comparative Study" Micromachines 11, no. 2: 229. https://doi.org/10.3390/mi11020229

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