Tunable and Nonlinear Metasurfaces

TUNABLE PLASMONIC METASURFACE FOR OPTICAL PHASED ARRAYS

A. Calà Lesina, D. Goodwill, E. Bernier, L. Ramunno, P. Berini

- IEEE JSTQE, 2021 -

DOI: 10.1109/JSTQE.2020.2991386

3D sketch of the plasmonic metasurface for phase control and beam steering. The unit cell of the metasurface (plasmonic pixel) is shown in the inset.

Simulation of beam steering

US patent US20210157179A1: Apparatus for plasmonic nanoantenna optical beam phase-shifter and steerer

Helium ion beam lithography and liftoff

S. Rashid, J. Walia, H. Northfield, C. Hahn, A. Olivieri, A. Calà Lesina, F. Variola, A. Weck, L. Ramunno, P. Berini

- Nano Futures, 2021 -

DOI: 10.1088/2399-1984/abfd98

Helium ion microscope (HIM) image of a gold nanoantenna array.

3D FDTD simulation vs measured transmittance for five array realizations.

Hyperpolarizability of Plasmonic Meta-Atoms in Metasurfaces

M.S. Bin-Alam, J.S. Baxter, K.M. Awan, A. Kiviniemi, Y. Mamchur, A. Calà Lesina, K.L. Tsakmakidis, M.J. Huttunen, L. Ramunno, K. Dolgaleva

- Nano Letters, 2021 -

DOI: 10.1021/acs.nanolett.0c02991

An artist’s depiction of (a) an equivalent RLC circuit diagram for the investigated nanoprisms, and (b) metasurface consisting of a random array of elongated gold nanoprisms.

On the performance of optical phased array technology for beam steering: effect of pixel limitations

A. Calà Lesina, D.J. Goodwill, É. Bernier, L. Ramunno, P. Berini

- Optics Express, 2020 -

DOI: 10.1364/OE.402894

(a) Array of radiating sources. (b) Spherical coordinates to describe beam steering in 3D.

VECTORIAL CONTROL OF NONLINEAR EMISSION VIA CHIRAL BUTTERFLY NANOANTENNAS: GENERATION OF PURE HIGH ORDER NONLINEAR VORTEX BEAMS

A. Calà Lesina, P. Berini, L. Ramunno

- Optics Express, 2017 -

DOI: 10.1364/OE.25.002569

Metasurface 3D Model

3D FDTD simulation of a metasurface of butterfly nanoantennas for THG beam structuring

Dual-Polarization Plasmonic Metasurface for Nonlinear Optics

A. Calà Lesina, L. Ramunno, P. Berini

- Optics Letters, 2015 -

DOI: 10.1364/OL.40.002874

THz radiation via difference frequency generation (DFG)

3D model of a gold metasurface embedded in GaAs. Exciting with orthogonally polarized signals at omega1 and omega2, we obtain a THz source perperdicular to the surface (Py).

3D map of the THz signal amplitude enhancement compared to the substrate without the metasurface.