Scientific Results

Shaping the Radiation Pattern of Second-Harmonic Generation from AIGaAs Dielectric Nanoantennas

Year: 2016

Authors: Carletti L., Locatelli A., Neshev D., De Angelis C.

Autors Affiliation: Department of Information Engineering, University of Brescia, Via Branze 38, 25123 Brescia, Italy
Nonlinear Physics Centre, Research School of Physics and Engineering, The Australian National University, ACT 2601, Canberra, Australia

Abstract: We study the manipulation of the radiation pattern of second-harmonic generation from AlGaAs all-dielectric nano antennas exhibiting electric and magnetic resonances. We show the importance of the interference of different higher order multipoles in the nonlinear response of dielectric antennas for shaping of their second -harmonic radiation pattern. In particular, we show how such multipolar interference can be engineered in AlGaAs nanodisks by manipulating the pump beam polarization, incidence angle, and disk geometry. In this way we demonstrate the shaping of the radiation pattern in order to increase the second -harmonic power by a factor of 8 when measured in experiment through a finite numerical aperture microscope objective.

Journal/Review: ACS PHOTONICS

Volume: 3 (8)      Pages from: 1500  to: 1507

More Information: The paper and the participation of all the authors have been made possible in the framework of the Erasmus Mundus NANOPHI project, contract number 2013 5659/002-001. L.C., C.D.A., and A.L. acknowledge financial support from U.S. Army (“Engineering second order nonlinear effects in optical antennas”) and CARIPLO (“SHAPES, Second-HArmonic Plasmon-Enhanced Sensing”). D.N. acknowledges the support of the Australian Research Council and of the Visiting Program of the University of Brescia. We thank M. Finazzi, Y. Kivshar, and G. Leo for the useful discussions.
KeyWords: nanoantennas; nonlinear scattering; second-harmonic generation; radiation pattern;
DOI: 10.1021/acsphotonics.6b00050

Citations: 62
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