Directionally induced quasi-phase matching in homogeneous AlGaAs waveguides

Year: 2017

Authors: Morais N., Roland I., Ravaro M., Hease W., Lemaître A., Gomez C., Wabnitz S., De Rosa M., Favero I., Leo G.

Autors Affiliation: Matériaux et Phénomènes Quantiques, Université Paris Diderot, CNRS, 10 rue Domon et Duquet,75013 Paris, France; Centre de Nanosciences et de Nanotechnologies, CNRS, Univ. Paris-Sud, Université Paris-Saclay 91460, Marcoussis, France; Department of Information Engineering, University of Brescia, Via Branze 38, 25123 Brescia, Italy; CNR-INO, Istituto Nazionale di Ottica, Via Campi Flegrei 34, 80078 Pozzuoli, Italy

Abstract: We report on the experimental observation of quasi-phase matching in a homogeneous waveguide. By fabricating a monolithic snake-shaped suspended AlGaAs nanowire on a (001) GaAs wafer, we demonstrate the unraveled version of a chi((2)) whispering-gallery-mode microdisk, obtaining second-harmonic generation in the optical telecom wavelength range. With a radius of curvature of 50 mu m and four spatial oscillations along the (110) average direction, a splitting of the second-harmonic spectrum occurs around the phase-matching wavelength of the corresponding straight waveguide. This splitting, which increases as the radius of curvature decreases, provides a useful degree of freedom for the design of small-footprint nonlinear photonic devices on-chip. (C) 2017 Optical Society of America

Journal/Review: OPTICS LETTERS

Volume: 42 (21)      Pages from: 4287  to: 4290

More Information: Consiglio Nazionale delle Ricerche (CNR) (Short Term Mobility Program 2016); SATT IdF-Innov; Ministero dell´Universita e della Ricerca (PRIN-2015KEZNYM).
KeyWords: Aluminum alloys; Aluminum gallium arsenide; Degrees of freedom (mechanics); Gallium alloys; Gallium arsenide; Nonlinear optics; Photonic devices; Waveguides; Whispering gallery modes, AlGaAs waveguides; Nonlinear photonic devices; Quasi phase matching; Radius of curvature; Second harmonic spectrum; Spatial oscillations; Straight waveguides; Telecom wavelengths, Phase matching
DOI: 10.1364/OL.42.004287

Citations: 20
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