Dielectric Photonic Devices & Systems beyond Visible II - Merging Optics and Microwave

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Optics and Lasers".

Deadline for manuscript submissions: 20 May 2024 | Viewed by 3018

Special Issue Editors


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Department of Electrical Engineering and Information, Entries Polytechnic University of Bari, Via Orabona, 4-70125 Bari, Italy
Interests: fiber optics; long period grating (LPG) fiber devices; rare-earth doped fiber laser; microwave photonics; microwave devices
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Dipartimento di Ingegneria Elettrica e dell’Informazione, Politecnico di Bari, 70125 Bari, Italy
Interests: integrated optics; photonic crystals; plasmonics; graphene-based microwave and optical devices; nonlinear optics; microwave photonics
Special Issues, Collections and Topics in MDPI journals

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Institute of Photonics and Nanotechnology, National Research Council, IFN-CNR CSMFO Lab., Via alla Cascata 56/C, Povo, 38123 Trento, Italy
Interests: glass photonics; properties, structure and processing of glasses, crystals and film for optical applications and photonics; integrated optics; transparent glass ceramics; confined structures including photonic crystals, waveguides, microcavities, and microresonators
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The recent technological advances in the field of dielectric photonics, integrated optics, and optical fiber-based systems have paved the way for novel application areas based on the employment of optical beams. Photonics, integrated optics, and optical fiber-based systems constitute nowadays a feasible technological platform, successfully exploited in 5G networks, Internet of Things (IoT), Industry 4.0, Telemedicine, Environment Monitoring, Precision Agriculture. In this context, innovative hybrid solutions, integrating optics with antennas and systems based on  micro- and millimetre wave propagation are strongly spreading.

Optical beam propagation/processing allows application in biomedicine, via the interaction of light with biological tissues, such as in optical diagnostic and therapy; communication by exploiting, in addition to the conventional fiber optic systems, microwave photonics and radio-over-fiber techniques; material processing, via high brilliance and high power optical sources; sensing with the development of novel LiDAR (Light Detection and Ranging o Laser Imaging Detection and Ranging) systems, novel SERS (Surface Enhanced Raman Spectroscopy) substrates, microstructured optical fiber and photonic crystal based sensors; aerospace application via the developing of high performance devices including optical gyroscopes, medium infrared Mid-IR tracking systems; optical homeland security and surveillance. These and many others promising applications are a straightforward consequence of the optical technology progress. As an example, a number of activated materials have been ad-hoc synthesized for the construction of novel optical sources, in both conventional and exotic wavelength ranges, by embedding rare earth ions in different host materials (glass oxides, fluorides, chalcogenides, glass ceramics, crystalline, organics etc.) or by inclusion of rare earth ions in molecular complexes. In addition, novel optical materials as graphene promise novel applications through innovative optical circuitries. The availability of low cost commercial tunable optical sources as quantum cascade lasers and the fabrication of resonant microcavities and microstructured fibers, such as the terahertz sources, allow novel chemical and biological sensing set-ups. Further improvement of sensor performances can be obtained by covering dielectric structures with thin metal layer exploiting plasmon propagation, wavelength resonances and diffraction gratings. Moreover, surprising applications have been originated from the progresses in the field of optical amplification, fluorescent probes, luminescent labels, optical converters, switches, detectors, etc.

One of the most intriguing aspects of the recent applied research is the progressive merging of the aforesaid optical technology with microwave and antenna solutions, for both obtaining access points and complementary physical mechanisms, as expected by the unifying electromagnetic theory, leading to similar engineering approaches.

This Special Issue collects both original contributions and review papers on the optical devices and systems beyond visible, covering an extremely wide area of interest which ranges from telecommunication to optical remote sensing and earth atmosphere monitoring, from medical diagnosis and therapy to material processing, and from aerospace to security. The blending between the technological platforms microwaves/antennas with integrated/fiber optics falls within the Special Issue topics, following the trend of several emerging applications in which these areas are often indistinguishable.

Dr. Francesco Prudenzano
Prof. Dr. Antonella D’Orazio
Dr. Maurizio Ferrari
Guest Editors

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Keywords

  • novel dielectric materials for NIR, Mid-IR, THz devices
  • rare earth based materials and devices
  • NIR and Mid-IR coherent light sources
  • supercontinuum generation
  • PBG devices, Metallo-dielectric photonic crystals, plasmonics
  • microresonators, integrated optics
  • components and system for biomedicine, interaction of light with biological tissues, optical diagnostic and therapy
  • microwave photonics applications and Radio-over-fibre transmission
  • optical 5G
  • optical antennas
  • THz and millimetre wave components, systems and applications
  • integration of microwave and optics
  • aerospace photonics

Published Papers (2 papers)

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11 pages, 1975 KiB  
Article
Fully Reconfigurable Photonic Filter for Flexible Payloads
by Annarita di Toma, Giuseppe Brunetti, Nabarun Saha and Caterina Ciminelli
Appl. Sci. 2024, 14(2), 488; https://doi.org/10.3390/app14020488 - 05 Jan 2024
Viewed by 666
Abstract
Reconfigurable photonic filters represent cutting-edge technology that enhances the capabilities of space payloads. These advanced devices harness the unique properties of light to deliver superior performance in signal processing, filtering, and frequency selection. They offer broad filtering capabilities, allowing for the selection of [...] Read more.
Reconfigurable photonic filters represent cutting-edge technology that enhances the capabilities of space payloads. These advanced devices harness the unique properties of light to deliver superior performance in signal processing, filtering, and frequency selection. They offer broad filtering capabilities, allowing for the selection of specific frequency ranges while significantly reducing Size, Weight, and Power (SWaP). In scenarios where satellite communication channels are crowded with various signals sharing the same bandwidth, reconfigurable photonic filters enable efficient spectrum management and interference mitigation, ensuring reliable signal transmission. Furthermore, reconfigurable photonic filters demonstrate their ability to adapt to the dynamic space environment, withstanding extreme temperatures, radiation exposure, and mechanical stress while maintaining stable and reliable performance. Leveraging the inherent speed of light, these filters enable high-speed signal processing operations, paving the way to various space payload applications, such as agile frequency channelization. This capability allows for the simultaneous processing and analysis of different frequency bands. In this theoretical study, we introduce a fully reconfigurable filter comprising two decoupled ring resonators, each with the same radius. Each resonator can be independently thermally tuned to achieve reconfigurability in both central frequency and bandwidth. The precise reconfiguration of both central frequency and bandwidth is achieved by using the thermo-optic effect along the whole ring resonator path. A stopband rejection of 45 dB, with a reconfigurable bandwidth and central frequency of 20 MHz and 180 MHz, respectively, has been numerically achieved, with a maximum electrical power of 11.50 mW and a reconfiguration time of 9.20 µs, by using the scattering matrix approach, where the elements have been calculated through Finite Element Method-based and Beam Propagation Method-based simulations. This performance makes the proposed device suitable as key building block of RF optical filters, useful in the next-generation telecommunication payload domain. Full article
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15 pages, 7103 KiB  
Article
A Novel L-Shaped Metalens for Ultra-Wide Band (UWB) Antenna Gain Improvement
by Vincenza Portosi, Antonella Maria Loconsole, Antonio Campana, Francesco Anelli and Francesco Prudenzano
Appl. Sci. 2023, 13(8), 4802; https://doi.org/10.3390/app13084802 - 11 Apr 2023
Cited by 2 | Viewed by 1816
Abstract
In this work, a novel metamaterial lens (metalens) is designed and optimized to improve the radiation performance of an antipodal Vivaldi antenna for wideband applications. The metalens is integrated into the antenna substrate, and placed close to the tapered slot in the end-fire [...] Read more.
In this work, a novel metamaterial lens (metalens) is designed and optimized to improve the radiation performance of an antipodal Vivaldi antenna for wideband applications. The metalens is integrated into the antenna substrate, and placed close to the tapered slot in the end-fire direction, allowing the preservation of the lightweight and compactness of the antenna. The prototype has been fabricated and characterized, demonstrating good agreement with the simulations. The insertion of the metalens allows, with respect to the pristine Vivaldi, a measured maximum gain of Gmax=14.2  dB, increased by about ΔGmax=4.8 dB; an operating bandwidth of f=3÷14.7 GHz, increased by Δf=1.2 GHz; and a radiation pattern with a maximum reduction in half-power beamwidth of ΔHPBWmax=31.3°, more symmetrical in the E and H planes. Full article
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