Enhancing nonlinear processes from dielectric nanoantennas: the role of the substrate

D. Rocco; C. De Angelis; D. de Ceglia; L. Carletti; M. A. Vincenti

doi:10.1117/12.2520564

30 April 2019 Enhancing nonlinear processes from dielectric nanoantennas: the role of the substrate

D. Rocco, C. De Angelis, D. de Ceglia, L. Carletti, M. A. Vincenti

Proceedings Volume 11026, Nonlinear Optics and Applications XI; 1102609 (2019) https://doi.org/10.1117/12.2520564
Event: SPIE Optics + Optoelectronics, 2019, Prague, Czech Republic

Abstract

We investigate the impact of different substrates on the radiation efficiency of nonlinear processes from dielectric nanoantennas. Several approaches have been considered to optimize the nonlinear radiation efficiency from these structures, but all the strategies have generally failed at limiting the amount of radiation at the harmonic frequencies that is lost in the substrate. It is well known that epsilon-near-zero (ENZ) materials, namely material showing a zero-crossing for the real part of the dielectric permittivity, have peculiar linear properties, such as their ability to realize perfect electromagnetic tunneling and re-direct antennas electromagnetic radiation. Here we first compare the second harmonic signal radiated from a cylindrical AlGaAs nanoantenna placed over different materials, including an ENZ substrate and found that the ability to re-direct the electromagnetic radiation is particularly favored when the ENZ condition occurs at the second harmonic frequency. These results let us foresee a novel approach to improve nonlinear processes at the nanoscale and the possibility to realize novel functionalities, such as beam steering and tailored antenna directivities thanks to the tunability of ENZ materials.

Conference Presentation

Citation Download Citation

D. Rocco, C. De Angelis, D. de Ceglia, L. Carletti, and M. A. Vincenti "Enhancing nonlinear processes from dielectric nanoantennas: the role of the substrate", Proc. SPIE 11026, Nonlinear Optics and Applications XI, 1102609 (30 April 2019); https://doi.org/10.1117/12.2520564

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available