| Title: |
Second-Harmonic Generation in Suspended AlGaAs Waveguides: A Comparative Study |
| Authors: |
Ravaro, Marco; Suffit, Stéphan; Filloux, Pascal; Lemaitre, Aristide; Favero, Ivan; Leo, Giuseppe |
| Contributors: |
Laboratoire Matériaux et Phénomènes Quantiques (MPQ (UMR_7162)); Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité); Centre de Nanosciences et de Nanotechnologies (C2N); Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS); ANR-18-ASTR-0007,SPAIN,Source paramétrique accordable injectée électriquement(2018) |
| Source: |
ISSN: 2072-666X ; Micromachines ; https://hal.science/hal-03052442 ; Micromachines, 2020, 11 (2), pp.229. ⟨10.3390/mi11020229⟩. |
| Publisher Information: |
CCSD; MDPI |
| Publication Year: |
2020 |
| Subject Terms: |
AlGaAs; waveguide; second-harmonic generation; [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics]; [NLIN]Nonlinear Sciences [physics] |
| Description: |
International audience ; 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. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| DOI: |
10.3390/mi11020229 |
| Availability: |
https://hal.science/hal-03052442; https://hal.science/hal-03052442v1/document; https://hal.science/hal-03052442v1/file/MDPI%202020.pdf; https://doi.org/10.3390/mi11020229 |
| Rights: |
info:eu-repo/semantics/OpenAccess |
| Accession Number: |
edsbas.DAEE4DDF |
| Database: |
BASE |