Switching the second harmonic generation by a dielectric metasurface via tunable liquid crystal

Year: 2020

Authors: Rocco D., Carletti L., Caputo R., Finazzi M., Celebrano, M., De Angelis C.

Autors Affiliation: Univ Brescia, Dept Informat Engn, Via Branze 38, I-25123 Brescia, Italy;‎ Natl Inst Opt INO, Via Branze 45, I-25123 Brescia, Italy; Univ Padua, Dept Informat Engn, Via G Gradenigo 6-B, Padua, Italy; Univ Calabria, Dept Phys, Via P Bucci,Cubo 31 C, I-87036 Arcavacata Di Rende, Italy; Univ Calabria, CNR NANOTEC, Via P Bucci,Cubo 31 C, I-87036 Arcavacata Di Rende, Italy; Univ Elect Sci & Technol China, Inst Fundamental & Frontier Sci, Chengdu 610054, Peoples R China; Politecn Milan, Dept Phys, Piazza Leonardo Da Vinci 32, I-20133 Milan, Italy

Abstract: Optical modulators are key ingredients in optoelectronics applications ranging from energy harvesting, sensor and imaging devices. In this framework, nonlinear photon conversion mechanisms constitute an attractive opportunity to add logic capabilities to these apparatuses. Here, we investigate the directionality of the emitted second harmonic signal generated in a dielectric metasurface consisting of AlGaAs nanocylinders embedded into a liquid crystal matrix. We numerically demonstrate that, by switching the liquid crystal orientation with a realistic voltage bias, it is possible to modulate the total power and the emission pattern of the SH signal coming from the proposed metasurface. Our results open important opportunities for tunable metadevices such as nonlinear holograms and dynamic displays. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.

Journal/Review: OPTICS EXPRESS

Volume: 28 (8)      Pages from: 12037  to: 12046

DOI: 10.1364/OE.386776

Citations: 20
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