Dispersion Engineered AlGaAs-on-Insulator Nanophotonics by Distributed Feedback

Year: 2026

Authors: Talenti F.R., Lovisolo L., Xiao Z.J., Saleh Z., Gerini A., Alonso-Ramos C., Morassi M., Lemaitre A., Harouri A., Wabnitz S., De Rossi A., Leo G., Vivien L.

Autors Affiliation: Univ Paris Saclay, Ctr Nanosci & Nanotechnol, CNRS, F-91120 Palaiseau, France; Univ Paris Cite, Lab Mat & Phenomenes Quant, F-75013 Paris, France; Sapienza Univ Rome, Dipartimento Ingn Elettron & Telecomunicaz, I-00184 Rome, Italy; CNR, INO, I-80078 Pozzuoli, Italy; Thales Res & Technol, F-91120 Palaiseau, France; Inst Univ France, F-75231 Paris, France.

Abstract: Technological advances in the fabrication of nanophotonic circuits have driven the scientific community to increasingly focus on the precise tailoring of their key optical properties, over a broadband spectral domain. In this context, modulation of the local refractive index can be exploited to customize an effective reflectivity by the use of distributed Bragg mirrors, enabling the on-chip integration of Fabry-Perot resonators. The resulting cavity length is strongly wavelength-dependent, offering practical solutions to the growing demand for dispersion engineering. Owing to their typically high core-to-cladding refractive index contrast, III-V semiconductor platforms enable the fabrication of strong Bragg reflectors. In addition, their intrinsically high nonlinear optical coefficients make these materials particularly attractive for nonlinear optics applications. In this work, we discuss the first experimental demonstration of a systematic, shape-constrained inverse design technique that tailors a prescribed dispersion profile, showing a strong agreement between simulations and measurements. In perspective, the proposed approach offers an efficient and general response to the challenge of dispersion engineering in integrated optical circuits.

Journal/Review: ACS PHOTONICS

Volume: 13 (3)      Pages from: 774  to: 781

More Information: The work is partly supported by the French RENATECH network. Other funding : ANR-22-CE92-0065 (Quadcomb), EU-NRRP, NextGenerationEU (PE00000001-program RESTART). L. Lovisolo acknowledges the support of French Agence-innovation defense N DGA01D22020572.
KeyWords: Fabry-Perot resonator; photonic crystal; distributed-feedback; AlGaAs; dispersion engineering; inverse design
DOI: 10.1021/acsphotonics.5c02388