Prof. Stefano Maci Profile

Prof. Stefano Maci

at Univ degli Studi di Siena

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Proceedings Article | 24 May 2022 Presentation

Self-complementary metasurfaces: novel platform for surface waves manipulation

Oleh Yermakov, Vladimir Lenets, Andrey Sayanskiy, Juan Baena, Enrica Martini, Stanislav Glybovski, Stefano Maci

Proceedings Volume PC12131, PC121310U (2022) https://doi.org/10.1117/12.2624162

KEYWORDS: Near field, Radio propagation, Polarization, Electromagnetic radiation, Antennas, Wave propagation, Telecommunications, Polarizers, Photonics, Optoelectronics

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Modern optical technologies require the miniaturization and planarization of the optical devices that leads to an urgent need for efficient control of localized light. In this aspect, surface electromagnetic waves on two-dimensional structures and materials attract a lot of attention, and can potentially become the main information carriers in planar data processing optical systems. In this work, for the first time, we investigate theoretically, numerically and experimentally the properties of surface waves at the self-complementary metasurfaces obeying Babinet’s duality principle. The main features demonstrated in this manuscript are: (1) All-frequency hyperbolicity of the self-complementary metasurface. This feature is in sharp contrast to the artificial resonant two-dimensional hyperbolic structures where the hyperbolic regime is defined by the spectral width between the resonances. (2) Extremely canalized propagation of surface waves that can be switched between orthogonal directions by small frequency detuning. First, we demonstrate the plasmon canalization with a record minimum divergence. Second, we show the routing of canalized surface wave. (3) The polarization degeneracy of the surface waves supported by a self-complementary metasurface. The spectrum of any isotropic medium is always double-degenerate with respect to polarization, but for surface waves the polarization degeneracy is not fulfilled. In this work, we explicitly demonstrate the polarization degeneracy of TE- and TM-polarized surface waves paving a way to a number of applications from planar polarizer of surface waves to polarization demultiplexer. The results obtained open new opportunities for the planar optical and photonic devices, optical data transfer and processing systems, and antennas applications.

Proceedings Article | 27 January 2017 Paper

Low-dimensional materials for optically-assisted microwave applications

C. Tripon-Canseliet, Z. Liu, L. Pierantoni, S. Combrié, A. De Rossi, S. Maci, J. Chazelas

Proceedings Volume 10111, 1011125 (2017) https://doi.org/10.1117/12.2255046

KEYWORDS: Microwave radiation, Semiconductors, Absorption, Semiconductor materials, Electromagnetism, Metamaterials, Phased array optics, Switching, Modeling, Integrated optics

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From latest nanotechnology advances, low-dimensional matter confinement delivered by nanostructuration or few-layer stacking offer new opportunities for ultimate light absorption performances. In this field, semiconducting 2D materials and photonic crystals have already demonstrated promising flexible optical properties from monoatomic to bulk structuration covering visible to IR spectral range. Today, these emerging materials such as Phosphorene, allow reconsideration of some physical effects such as photoconductivity. Indeed, its exploitation in integrated planar structures become c in terms of efficient local contactless control with a high degree of tunability by optics in association with high dark resistivity, fast carrier dynamics, and sub-wavelength light coupling solutions compatibility. Multiscale modeling and design tools implementing material anisotropic parameters from atomic configuration up to mesoscale, in complement with multiscale optical characterization in a large frequency bandwidth opens routes to new microwave signal processing functionalities such as switching, generation, amplification and emission over a large frequency bandwidth, that could not be achieved by full electronic solutions. This paper will report on latest demonstrations of high performance photoconductive structures for high frequency applications and review state-of-the-art research work in this area, with a specific focus on latest demonstrations for airborne applications.

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