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: Univ Paris Diderot, Mat & Phenomenes Quant, CNRS, 10 Rue Domon & Duquet, F-75013 Paris, France; Univ Paris Saclay, Ctr Nanosci & Nanotechnol, CNRS, Univ Paris Sud, F-91460 Marcoussis, France; Univ Brescia, Dept Informat Engn, Via Branze 38, I-25123 Brescia, Italy; Ist Nazl Ottica, CNR INO, Via Campi Flegrei 34, I-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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