Antonio Ferraro

Antonio Ferraro
Consiglio Nazionale delle Ricerche- Istituto di Nanotecnologia (CNR-Nanotec)

Doctor of Philosophy

About

57
Publications
7,370
Reads
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611
Citations
Citations since 2016
56 Research Items
604 Citations
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
Introduction
Antonio Ferraro currently works at the Institute for Microelectronics and Microsystems IMM, Italian National Research Council. Antonio does research in Optics, Terahertz, Antenna, Molecular and Optical Physics and Experimental Physics. Their current project is 'Terahertz devices.'
Additional affiliations
June 2019 - present
Università della Calabria
Position
  • PostDoc Position
February 2014 - May 2019
Italian National Research Council
Position
  • Fellow
January 2014 - May 2017
Università della Calabria
Position
  • PhD Student
Description
  • PhD student in collaboration with CNR-IMM
Education
February 2014 - April 2017
Università della Calabria
Field of study
  • Physical, Chemical and Materials Sciences and Technologies
October 2009 - July 2012
Università della Calabria
Field of study
  • Science and Engineering of Innovative and Functional Materials
October 2006 - December 2009
Università della Calabria
Field of study
  • Material Science

Publications

Publications (57)
Article
Full-text available
Anticounterfeiting of goods is an urgent need both for luxury and cheap everyday life products. Their identification is usually based on overt technologies as printed codes, easy to produce but to be cloned as well. In this work, a standard QR‐code printed on office paper but hidden by a plasmonic multilayer system is exploited. The covert label is...
Conference Paper
Thanks to an optimized nanostructures arrangement , we report on temperature variation of 250 • C by impinging a plasmonic device with a green laser radiation. This great temperature value is caused by the strong confinement of electric field that is due to the covering gold nano heaters with a layer of polymer + dye. A chopper-modulated impinging...
Conference Paper
An increasing amount of research is being devoted to improve the spatial resolution in direct laser writing (DLW) technique allowing the fabrication of complex 2D and 3D nanoscale devices. Among the various possibilities, we exploited uncommon features as extraordinary transmittance, zero re ectance, giant dephasing and epsilon-near-zero relative p...
Article
We demonstrate the effectiveness of frequency selective surface filters in wireless communications at low terahertz (THz) frequencies. Full-wave simulations of pass-band filters designed at 270 GHz and 330 GHz are compared with measurements over 220–360 GHz, showing remarkable agreement. The filter spectral response is used to analytically model a...
Chapter
The extensive progress in nanofabrication techniques enabled innovative methods for molding light at the nanoscale. Subwavelength structured optical elements and, in general, metasurfaces and metamaterials achieved promising results in several research areas, such as holography, microscopy, sensing and nonlinear optics. Still, a demanding challenge...
Article
Full-text available
Metamaterials are artificial electromagnetic media structured on the sub-wavelength scale for controlling the propagation of waves by means of transformation optics. The research activity is now focusing on attaining active metamaterial functionalities, including tunability, and the shaping and modulation of electromagnetic waves. Among all the dif...
Article
Full-text available
Various systems based on nanostructures built on optical waveguides have recently appeared in literature, since this configuration guarantees an efficient optical feeding to nano-elements and/or the possibility to manipulate guided signals. In this work, we present the analysis of the optical scattering properties of such type of structures, more s...
Article
Full-text available
Multilevel anticounterfeiting Physical Unclonable Function (PUF) tags based on thin film of silver (Ag), Zinc Oxide (ZnO) and PolyVinylPyrrolidone (PVP), are experimentally demonstrated and validated. We exploit the low adhesion of silver to glass and consequent degradation during ZnO deposition to induce morphological randomness. Several photograp...
Article
Full-text available
We experimentally demonstrate the possibility to modulate the second harmonic power emitted by nonlinear AlGaAs metasurfaces embedded in a liquid crystal (LC) matrix. This result is obtained by changing the relative in-plane orientation between the LC director and the linear polarization of the light at the excitation wavelength. According to numer...
Article
Full-text available
The coupling of gold nanoantennas (AuNAs) in the arrangement of monomers in bidimensional gratings is investigated both experimentally and numerically. The influence of edge diffraction, corresponding to the grazing propagation of specific diffracted orders, and the dependence of grating parameters on lattice plasmon modes are studied. It is shown...
Article
Full-text available
Plasmonic nanoheaters are reported that produce a significant local heating when excited by a 532 nm wavelength focused laser beam. A significant temperature increase derives from the strong confinement of electric field enabled by the specific arrangement of Au nanodisks constituting the nanoheater. The thermal response is much more sensitive when...
Article
Full-text available
We experimentally investigate the photothermal conversion in disordered silicon nanowires (SiNWs) grown on a glass substrate by plasma-enhanced chemical vapor deposition. The temporal and spatial response under illumination of a 532 nm laser has been measured by means of an infrared (IR) thermocamera. Fast heat generation and adjustable temperature...
Preprint
Plasmonic nanoheaters are reported that produce a significant local heating when excited by a 532 nm wavelength focussed laser beam. A significant temperature increase derives from the strong confinement of electric field enabled by the specific arrangement of Au nanodisks constituting the nanoheater. The thermal response is much more sensitive whe...
Article
Full-text available
A novel technique is developed to improve the resolution of two‐photon direct laser writing lithography. Thanks to the high collimation enabled by extraordinary εNZ (near‐zero) metamaterial features, ultrathin dielectric hyper‐resolute nanostructures are within reach. With respect to the standard direct laser writing approach, a size reduction of 8...
Article
Full-text available
The control of amplitude, losses and deflection of light with elements of an optical array is of paramount importance for realizing dynamic beam steering for light detection and ranging applications (LIDAR). In this paper, we propose an optical beam steering device, operating at a wavelength of 1550 nm, based on high index material as molybdenum di...
Chapter
DESCRIPTION In the last 20 years, metamaterials have attracted much attention for their exotic physical behaviors not commonly present in nature. However, this class of micro- and nanostructured artificial media, characterized by groundbreaking electromagnetic and photonic properties, has encountered difficulty in entering industrial upscale and en...
Chapter
DESCRIPTION Plasmonic nanostructures show outstanding promise in allowing sensitive temperature control, due to their natural ability to strongly confine a nanoscale electric field and release heat. In this chapter, the evolution of thermoresponsive metastructures is described from their introduction as amorphous arrangements of homogeneously distr...
Chapter
DESCRIPTION A growing research field has recently emerged on the investigation of toroidal multipole resonances and the closely related nonradiating anapole state in both dielectric and metallic metastructures working in the visible, near-infrared, and terahertz spectrum. Here we provide an overview on the anapole state and toroidal multipole excit...
Article
Full-text available
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Preprint
Full-text available
Metalenses offer the ground-breaking opportunity to realize highly performing low-weight, flat and ultrathin, optical elements which substantially reduce size and complexity of imaging systems. Today, a major challenge in metalenses design is still the realization of achromatic optical elements ideally focussing a broad wavelength spectrum at a sin...
Preprint
Full-text available
A novel technique is reported to improve the resolution of two-photon direct laser writing lithography. Thanks to the high collimation enabled by extraordinary $\varepsilon_{NZ}$ (near-zero) metamaterial features, ultra-thin dielectric hyper resolute nanostructures are within reach. With respect to the standard direct laser writing approach, a size...
Article
This work reports on numerical and experimental results obtained in plasmonic metal–insulator nanocavities. The systems are composed of silver as metal, and different materials as insulator, namely polyvinylpyrrolidone (PVP), indium tin oxide (ITO), and zinc oxide (ZnO). The proposed nanocavities exhibit extraordinary optical effects as tunable col...
Preprint
This work presents numerical and experimental results of plasmonic Metal-Insulator optical nano-cavities. The systems are composed of Silver as metal, polyvinylpyrrolidone or indium tin oxide or zinc oxide as insulator. The proposed nano-cavities exhibit extraordinary effects as colors changing in function of the incident/view angles, enhancement o...
Article
We experimentally demonstrate that electromagnetically thin polyimide substrates can mitigate substrate-induced detrimental effects to the performance of metallic metasurfaces. A planar quarter-wave plate for the microwave K-band is fabricated on a polyimide substrate of deep subwavelength thickness by means of standard photolithography. By properl...
Conference Paper
We theoretically propose the concept of loading microwave waveguides with periodic arrays of dielectric elements that emulate the electromagnetic response of two-dimensional metasurfaces. We focus on the case study of a metasurface composed of dielectric cuboids, which is designed to exhibit a strong toroidal dipole resonance in the microwave X-ban...
Conference Paper
A novel free-standing dielectric metasurface that shows a strong toroidal resonance in the sub-THz range is proposed and demonstrated. Theoretical and experimental studies confirm the basic operation principle and electromagnetic response of the metasurface. This first demonstration of a single-layer silicon metasurface opens new venues of research...
Article
In this work, we design and experimentally demonstrate a novel terahertz (THz) filter exhibiting a flattened spectral response in the atmospheric transmission window around the central frequency of 300 GHz. The innovative concept behind this filter is the coupling of Fabry–Perot and guided mode resonances. The latter arise from a two-dimensional pa...
Conference Paper
In this work, a novel method to obtain all-dielectric toroidal response metasurfaces in the W-band and THz range is demonstrated. Two designs are proposed, a symmetric and asymmetric disk metasurface. The first design is intended to corroborate the theoretical analysis, demonstrating the excitation of a strong toroidal mode resonance at 93.2 GHz. T...
Conference Paper
In this work, a novel wavelength selective switch is proposed and demonstrated. This new configuration avoid the use of grating and lenses, as a result, a very compact and lightweight ultra-selective wavelength switch can be obtained. For this, a novel tunable ultra-selective mirror is used. The tunability is achieved by using LC, the ultra-high Q-...
Article
Full-text available
A single-layer, all-dielectric metasurface exhibiting a strong toroidal resonance in the low-atmospheric loss radio window of the subterahertz W-band is theoretically proposed and experimentally demonstrated. The metasurface is fabricated on a high-resistivity floating-zone silicon wafer by means of a single-process, wet anisotropic etching techniq...
Article
Full-text available
We theoretically investigate the possibility to load microwave waveguides with dielectric particle arrays that emulate the properties of infinite, two-dimensional, all-dielectric metasurfaces. First, we study the scattering properties and the electric and magnetic multipole modes of dielectric cuboids and identify the conditions for the excitation...
Article
Full-text available
In this work, a dielectric metasurface consisting of hollow dielectric nanocuboids, with ultrahigh quality factor, is theoretically proposed and demonstrated. The variation of the hole size of the cuboid allows for the tuning of the resonant anapole mode in the nanoparticles. The metasurface is designed to operate in two complementary modes, namely...
Article
We propose metal-semiconductor-metal cavity arrays as the active element of electrically tunable metasurfaces operating in the terahertz spectrum. Their function is based on reverse biasing the Schottky junction formed between top metal strips and the n-type semiconductor buried beneath. A gate bias between the strips and a back metal reflector con...
Article
Full-text available
This work proposes the use of the refractive index sensitivity of non-radiating anapole modes of high-refractive-index nanoparticles arranged in planar metasurfaces as a novel sensing principle. The spectral position of anapole modes excited in hollow silicon nanocuboids is first investigated as a function of the nanocuboid geometry. Then, nanostru...
Article
Ever since the advent of microwave technology, tunable devices, such as phase shifters, resonators, and antennas, have been indispensable in applications requiring radiofrequency signal filtering, beam shaping, or steering. This necessity becomes even more relevant in view of a new era in high‐bandwidth wireless communications in 5G networks, satel...
Article
Full-text available
We experimentally and theoretically demonstrate a class of narrowband transmissive filters in the terahertz spectrum. Their operation is based on the excitation of guided-mode resonances in thin films of the low-loss cyclo-olefin polymer Zeonor, upon which aluminum stripe and patch arrays are patterned via standard photolithography. The filters are...
Article
A comprehensive framework for the theoretical and experimental investigation of thin conducting films for terahertz applications is presented. The electromagnetic properties of conducting polymers spin-coated on low-loss dielectric substrates are characterized by means of terahertz time-domain spectroscopy and interpreted through the Drude-Smith mo...
Article
Full-text available
By structuring a luminescent dielectric interface as a relief diffraction grating with nanoscale features, it is possible to control intensity and direction of emitted light. The composite structure of the grating is based on a fluorescent dye (Lumogen F RED 305) dispersed in a polymeric matrix (polymethylmethacrylate, PMMA). Measurements demonstra...
Article
Full-text available
The spectral response of a terahertz (THz) filter is investigated in detail for different angles of incidence and polarization of the incoming THz wave. The filter is fabricated by patterning an aluminum frequency-selective surface of cross-shaped apertures on a thin foil of the low-loss cyclo-olefin polymer Zeonor. Two different types of resonance...
Article
Full-text available
Wire-grid polarizers constitute a traditional component for the control of polarization in free-space devices that operate in a broad part of the electromagnetic spectrum. Here, we present an aluminium-based THz wire grid polarizer, fabricated on a sub-wavelength thin flexible and conformal foil of Zeonor polymer having a thickness of 40µm. The fab...
Article
Periodical elements made by stacking thin layers of the cyclo-olefin polymer Zeonor, separated by spacers made of bi-adhesive tape, are used as building blocks for realizing tunable terahertz (THz) filters. The basic block is a Bragg reflector whose bandgap can be controlled by changing the geometrical features of the periodical elements. By combin...
Conference Paper
Novel liquid-crystal tunable metamaterial devices for terahertz wave manipulation are designed and investigated. Deeply subwavelength layers of nematic materials are introduced in metal-liquid-crystal-metal cavities, leading to strong interaction of the THz wave with the liquid crystal anisotropy. The enhanced response in the liquid-crystal layer y...
Conference Paper
Mechanically tunable Bragg filters at terahertz frequencies are designed, fabricated by a simple procedure, and characterized via THz time-domain spectroscopy. The Bragg reflectors are composed by stacking thin cyclo-olefin Zeonor polymer layers, which are separated by spacers made of a bi-adhesive tape. The defect cavity is void and its thickness...
Conference Paper
A THz wire grid polarizer on cyclo-olefin Zeonor polymer film that exhibits high extinction ratio and low losses is theoretically and experimentally investigated. The polarizer has an extinction ratio between 30 and 45 dB and insertion losses below 1 dB in the 0.3–2.5 THz range. The high-performance characteristics of the polarizer are preserved ev...
Article
Full-text available
An aluminum-based terahertz (THz) wire grid polarizer is theoretically investigated and experimentally demonstrated on a subwavelength thin flexible and conformal foil of the cyclo-olefin Zeonor polymer. THz time-domain spectroscopy characterization, performed on both flat and curved configurations, reveals a high extinction ratio between 40 and 45...
Article
Realization of highly efficient holographic structures can be obtained by combining the POLICRYPS technique and the use of a spatial light mod- ulator. To achieve this result, a new pre-polymer mixture is necessary that is sensitive to visible light and fulfills all requirements of the POLICRYPS technique. In this paper, we report on our efforts to...

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Projects

Project (1)
Project
The goal of the project is to design, fabricate and characterize THz components with basic and advanced functionalities.