Second Harmonic Emission From Dielectric Nanoresonators in the Absorption Regime

Year: 2023

Authors: Tognazzi A., Franceschini P., Rocco D., Carletti L., Locatelli A., Gandolfi M., Zappa D., Cino AC., Comini E., Leo G., De Angelis C.

Autors Affiliation: Univ Palermo, Dept Engn, I-90128 Palermo, Italy; CNR, Ist Nazl Ott, I-25123 Brescia, Italy; Univ Brescia, Dept Informat Engn, I-25123 Brescia, Italy; Consorzio Interuniv Telecomunicaz, I-43124 Parma, Italy; Univ Paris Cite, Mat & Phenomenes Quant, F-75014 Paris, France.

Abstract: We study second harmonic generation in dielectric nanocylinders as a function of the wavelength of the incident field and geometrical dimensions. Uncommonly, we consider a spectral range in which the emitted nonlinear signal is partially absorbed by the dielectric. Surprisingly, we reveal that the second harmonic efficiency does not decrease as the imaginary part of the complex dielectric refractive index increases. Indeed, the presence of higher order multipoles supported by the resonators at the fundamental wavelength can significantly boost the generated second harmonic signal even in the dielectric absorption spectral region achieving nonlinear efficiency of the same order of magnitude with respect to the lossless case.

Journal/Review: IEEE PHOTONICS TECHNOLOGY LETTERS

Volume: 35 (9)      Pages from: 505  to: 508

More Information: This work was supported in part by the European Commission under Grant 899673 and Grant FETOPEN-01-2018-2019-2020; in part by Consiglio Nazionale delle Ricerche (Joint Laboratories Program) under Grant SAC.AD002.026; and in part by Ministero dell’Is truzione, dell’Universita e della Ricerca [Progetto di Rilevante Interesse Nazionale (PRIN) NOnlinear photonics with MEtal-less Nanoantennas and metasurfaces (NOMEN)] under Grant 2017MP7F8F. The work of Andrea Tognazzi and Marco Gandolfi was supported by the European Union through FESR o FSE, Programma Operativo Nazionale (PON) Ricerca e Innovazione 2014-2020 under Grant DM 1062/2021.
KeyWords: Laser beams; Optical imaging; Holography; Harmonic analysis; Absorption; Optical resonators; Optical sensors; Second harmonic generation; absorption; nanoresonators; dielectric
DOI: 10.1109/LPT.2023.3260878

Citations: 2
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