Shaping the Nonlinear Emission Pattern of a Dielectric Nanoantenna by Integrated Holographic Gratings

Year: 2018

Authors: Ghirardini L., Marino G., Gili VF., Favero I., Rocco D., Carletti L., Locatelli A., De Angelis C., Finazzi M., Celebrano M., Neshev DN., Leo G.

Autors Affiliation: Politecn Milan, Dept Phys, Piazza Leonardo Da Vinci 32, I-20133 Milan, Italy; Univ Paris Diderot, CNRS, Lab Mat & Phenomenes Quant, UMR 7162, 10 Rue A Domon & L Duquet, F-75013 Paris, France; Univ Brescia, Dept Informat Engn, Via Branze 38, I-25123 Brescia, Italy; Natl Inst Opt INO, Via Branze 45, I-25123 Brescia, Italy; Australian Natl Univ, Res Sch Phys & Engn, Nonlinear Phys Ctr, Canberra, ACT 2601, Australia.

Abstract: We demonstrate the shaping of the second-harmonic (SH) radiation pattern from a single AlGaAs nanodisk antenna using coplanar holographic gratings. The SH radiation emitted from the antenna toward the otherwise forbidden normal direction can be effectively redirected by suitably shifting the phase of the grating pattern in the azimuthal direction. The use of such gratings allows increasing the SH power collection efficiency by 2 orders of magnitude with respect to an isolated antenna and demonstrates the possibility of intensity-tailoring for an arbitrary collection angle. Such reconstruction of the nonlinear emission from nanoscale antennas represents the first step toward the application of all-dielectric nanostructures for nonlinear holography.

Journal/Review: NANO LETTERS

Volume: 18 (11)      Pages from: 6750  to: 6755

More Information: G.L. acknowledges Aristide Lemaitre (CNRS C2N) for the epitaxial wafers and SATT IdF-Innov, ANR Science and Engineering of Advanced Materials (SEAM) Labex, and MULTIPLY EU Co-fund program for financial support. The work was partially supported by the Australian Research Council and by the Framework of the Erasmus Mundus NANOPHI Project.
KeyWords: Second harmonic generation; beaming; collection efficiency; nonlinear nanoantennas; gratings
DOI: 10.1021/acs.nanolett.8b02432

Citations: 28
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