THz Generation via Optical Rectification in Nanomaterials: Universal Modeling Approach and Effective ?(sic)(2) Description

Year: 2024

Authors: Leon UA., Carletti L., Rocco D., De Angelis C., Della Valle G.

Autors Affiliation: Politecn Milan, Dipartimento Fis, Piazza Leonardo Vinci 32, I-20133 Milan, Italy; Univ Brescia, Dept Informat Engn, Via Branze 38, I-25123 Brescia, Italy; Natl Inst Opt INO, Consiglio Nazl Ric, Via Branze 45, I-25123 Brescia, Italy; CNR, Ist Foton & Nanotecnol, Piazza Leonardo da Vinci 32, I-20133 Milan, Italy; INFN, Sez Milano, Ist Nazl Fis Nucl, Via Celoria 16, I-20133 Milan, Italy.

Abstract: Optical rectification (OR) at the nanoscale has attracted an increasing interest in the prospect of providing efficient ultracompact terahertz (THz) sources. Here, a universal modeling approach capable of addressing both isotropic and anisotropic all-dielectric nonlinear nanomaterials on an ultra-broad spectral range, covering the highly dispersive phonon-polariton window, and different orientations of the crystallographic axes with respect to the geometry of the structure is reported. This analysis is exemplified by considering two study cases, that is, nanopillars of AlGaAs and of LiNbO3. A close comparison between the two cases is established in terms of THz generation efficiency from 4 to 14 THz. Phonon-polariton contributions to the OR process are disentangled from the electronic one, and a model order reduction based on the reciprocity theorem is applied and validated on both the considered configurations. These results, combined with the inspection of the THz near-field features, pave the way to the design and optimization of nonlinear metasurfaces for THz generation and detection at the nanoscale.

Journal/Review: LASER & PHOTONICS REVIEWS

Volume: 18 (2)      Pages from: 2300669-1  to: 2300669-10

More Information: This publication is part of the METAFAST project that received funding from the European Union Horizon 2020 Research and Innovation programme under Grant Agreement No. 899673. This work reflects only the authors views, and the European Commission is not responsible for anyuse that may be made of the information it contains. The authors also acknowledge support from the Ministero dell’Istruzione, dell’Universitae della Ricerca (PRIN 2020EY2LJT_002 Multiscale Metasurfaces for Tera Hertz Generation and Radiation by Optical Rectification (METEOR), PRIN2022 Project GRACE6G (2022H7RR4F), and PRIN 2022BC5BW5 NOnlinear LIthium niobate Metasurfaces for Integrated THz generation (NO LIM-ITHz)).
KeyWords: all-dielectric nanoantennas; difference-frequency generation; localized phonon-polaritons; nonlinear nanophotonics; THz sources
DOI: 10.1002/lpor.202300669

Citations: 3
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