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680 results on '"Frezza, F."'

1. Giving light a new twist with standard optical fibres: rainbow Archimedean spiral emission

Author

Mangini, F., Ferraro, M., Zitelli, M., Kalashnikov, V., Niang, A., Mansuryan, T., Frezza, F., Tonello, A., Couderc, V., Aceves, A. B., and Wabnitz, S.

Subjects
Physics - Optics
Abstract

We demonstrate a new practical approach for generating multicolour spiral-shaped beams. It makes use of a standard silica optical fibre, combined with a titled input laser beam. The resulting breaking of the fibre axial symmetry leads to the propagation of a helical beam. The associated output far-field has spiral shape, independently of the input laser power value. Whereas, with a high-power near-infrared femtosecond laser, a visible supercontinuum spiral emission is generated. With appropriate control of the input laser coupling conditions, the colours of the spiral spatially self-organize in a rainbow distribution. Our method is independent of the laser source wavelength and polarization. Therefore, standard optical fibres may be used for generating spiral beams in many applications, ranging from communications to optical tweezers and quantum optics.

Published
2020

5. Optimal piezo-electro-mechanical coupling to control plate vibrations

Author

Alessandroni, S., dell'Isola, F., and Frezza, F.

Subjects
Mathematical Physics
Abstract

A new way of coupling electrical and mechanical waves, using piezoelectric effect, is presented here. Since the energy exchange between two systems supporting wave propagation is maximum when their evolution is governed by similar equations, hence, an optimal electromechanical coupling is obtained by designing an electric network which is "analog" to the mechanical structure to be controlled. In this paper, we exploit this idea to enhance the coupling, between a Kirchhoff-Love plate and one possible synthesis of its circuital analog, as obtained by means of a set of piezoelectric actuators uniformly distributed upon the plate. It is shown how this approach allows for an optimal energy exchange between the mechanic and the electric forms independent of the modal evolution of the structure. Moreover, we show how an efficient electric dissipation of the mechanical energy can be obtained adding dissipative elements in the electric network., Comment: 9 pages

Published
2010

6. Role Of Immune-Nutrition In Sars-Cov 2 Patients Admitted To Semi-Intensive Unit

Author

Scarpellini, E., primary, Basilico, M., additional, Scarcella, M.L., additional, Giostra, N., additional, Di Bernardino, A., additional, Lattanzi, E., additional, Santori, P., additional, Petrelli, G., additional, Frezza, F., additional, Ciannamei, E., additional, Di Ubaldo, O., additional, Parisciani, M., additional, and Rasetti, C., additional

Published
2023
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8. Electromagnetic scattering of a plane wave by a perfectly conducting elliptic cylinder near a plane surface

Author

Santini, C., Mangini, F., and Frezza, F.

Subjects
Electromagnetic scattering, Elliptic cylinder, Plane surface, Spectral domain method, Plane-wave spectrum, Mathieu functions, Elliptic cylinder, Plane-wave spectrum, Radiation, Plane surface, Electromagnetic scattering, Mathieu functions, Spectral domain method, Spectroscopy, Atomic and Molecular Physics, and Optics
Published
2023

11. Electromagnetic Scattering by Cylindrical Objects on Generic Planar Substrates: Cylindrical-Wave Approach

Author

Borghi, R., Frezza, F., Santarsiero, M., Schettini, G., Beig, R., editor, Ehlers, J., editor, Frisch, U., editor, Hepp, K., editor, Hillebrandt, W., editor, Imboden, D., editor, Jaffe, R.L., editor, Kippenhahn, R., editor, Lipowsky, R., editor, Löhneysen, H.v., editor, Ojima, I., editor, Weidenmüller, H.A., editor, Wess, J., editor, Zittartz, J., editor, Moreno, Fernando, editor, and González, Francisco, editor

Published
2000
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14. Economia e Ingegneria. Dinamiche comparate

Author

Acocella, N., Alippi, A., Allocca, N., Annesini, M. C., Calabrese, M., Carboni, B., Caricchi, F., Carillo, S., Frezza, F., Gallo, R., Lacarbonara, W., Monaco, S., Napolitano, F., Ridolfi, E., and Verdone, N.

Subjects
economia, ingegneria, modelli
Published
2022

16. Electromagnetic scattering by metal spheres

Author

Huang, F., Mangini, F., Batool, S., Khannan, S., Proietti Zaccaria, R., and Frezza, F.

Subjects
metamaterials, electromagnetic scattering, plasmonics
Published
2022

30. Broadband Electromagnetic Sensing for Food Quality Control: A Preliminary Experimental Study

Author

Scapaticci, R., primary, Zappia, S., additional, Catapano, I., additional, Ruello, G., additional, Bellizzi, G., additional, Pasquino, N., additional, Cavagnaro, M., additional, Pisa, S., additional, Piuzzi, E., additional, Frezza, F., additional, Vipiana, F., additional, Vasquez, J.A. Tobon, additional, Ricci, M., additional, and Crocco, L., additional

Published
2021
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37. Nonlinear multimode fiber optics: recent advances

Author

Zitelli, M., Mangini, F., Ferraro, M., Leggio, L., Kalashnikov, V., Crescenzi, R., Frezza, F., Niang, A., Modotto, D., Hansson, T., Kharenko, D., Babin, S., Mansuryan, T., Tonello, A., Couderc, V., and Wabnitz, S.

Subjects
optical fibers, nonlinear optics, optical solitons, Kerr effect, four wave mixing
Published
2020

39. Rainbow spiral emission from optical fibers

Author

Mangini, F., primary, Ferraro, M., additional, Zitelli, M., additional, Kalashnikov, V., additional, Niang, A., additional, Mansuryan, T., additional, Frezza, F., additional, Tonello, A., additional, Couderc, V., additional, Aceves, A.B., additional, and Wabnitz, S., additional

Published
2021
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50. Design, Realization and Characterization of a Wide-Angle Microwave Metasurface Absorber

Author

Sassolini, E., Astorino, M. D., Khalid, M., Lia, E., Muzi, M., Simeoni, P., Tedeschi, N., Veroli, A., Simonetto, A., and Frezza, F.

Subjects
Materials science, business.industry, Metasurface, Wide-angle absorbance, Unit cell, Periodic structure, Split-ring resonator, Characterization (materials science), periodic structure, split-ring resonator, unit cell, wide-angle absorbance, metasurface, General Earth and Planetary Sciences, Optoelectronics, business, Realization (systems), Microwave, General Environmental Science
Abstract

In this article, we present a metamaterial absorber (MMA), and more specifically a metasurface based on a periodic structure consisting of double split-ring resonators (dSRR) which efficiently absorbs electromagnetic radiation for a wide range of incidence angles for both the transverse electric (TE) and the transverse magnetic (TM) polarizations. The proposed unit cell was designed employing a full 3-D electromagnetic solver based on the Finite Element Method (FEM). The unit cell consists of a square splitring resonator and a thin metallic plate separated by a dielectric layer. Investigations of parameterization and optimization have shown that small modifications in the geometry of the resonator led to enhanced angular absorption. The numerical simulation stage was followed by design and fabrication of a prototype containing several unit cells. The measurements on the prototype show an absorbance peak larger than 84% and 58% for the incidence angles teta=0 degree and teta=70degree respectively, at 9.73 GHz. The proposed MMA and its variations enable numerous applications such as defense systems, communication and stealth technologies.

Published
2019

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