Browsing by Author "Tasolamprou, A. C."

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  • Design, Fabrication, and Characterization of a Proof-of-Concept Multi-functional Microwave Metasurface using Static Loads
    (2021-09-20) Pitilakis, A.; Tsilipakos, O.; Seckel, M.; Christodoulou, M.; Tasolamprou, A. C.; Liu, F.; Manessis, D.; Kantartzis, N. V.; Liaskos, C.; Soukoulis, C. M.; Tretyakov, S. A.; Kafesaki, M.
     A4 Artikkeli konferenssijulkaisussa
    We present the design, fabrication, and characterization of a proof-of-concept reconfigurable multifunctional metasurface. Our implementation relies on a printed circuit board loaded with commercial-off-the-shelf resistors and capacitors (surface mount devices) to shape the metasurface response in the microwave regime spanning 4-12 GHz. In a broader vision, these static loads are to be replaced by computer-controlled chips, thus realizing a software-defined metamaterial vision. In the current implementation, the same type of board is loaded with different combinations of resistive and reactive loads, to model different configurations and realize the corresponding functionalities, such as absorption, steering, and polarizing. Our anechoic chamber measurements indicate good agreement between simulation and experiment.
  • Electromagnetic Aspects of Practical Approaches to Realization of Intelligent Metasurfaces
    (2018-11-13) Liu, F.; Tsilipakos, O.; Wang, X.; Pitilakis, A.; Tasolamprou, A. C.; Mirmoosa, M. S.; Kwon, D. H.; Kossifos, K.; Georgiou, J.; Kafesaki, M.; Soukoulis, C. M.; Tretyakov, S. A.
     A4 Artikkeli konferenssijulkaisussa
    We thoroughly investigate the electromagnetic response of intelligent functional metasurfaces. We study two distinct designs operating at different frequency regimes, namely, a switch-fabric-based design for GHz frequencies and a graphene-based approach for THz band, and discuss the respective practical design considerations. The performance for tunable perfect absorption applications is assessed in both cases.
  • Multifunctional Metasurface Architecture for Amplitude, Polarization and Wave-Front Control
    (2022-06) Pitilakis, A.; Seckel, M.; Tasolamprou, A. C.; Liu, F.; Deltsidis, A.; Manessis, D.; Ostmann, A.; Kantartzis, N. V.; Liaskos, C.; Soukoulis, C. M.; Tretyakov, S. A.; Kafesaki, M.; Tsilipakos, O.
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    Metasurfaces (MSs) have been utilized to manipulate different properties of electromagnetic waves. By combining local control over the wave amplitude, phase, and polarization into a single tunable structure, a multifunctional and reconfigurable metasurface can be realized, capable of full control over incident radiation. Here, we experimentally validate a multifunctional metasurface architecture for the microwave regime, where variable loads are connected behind the back plane to reconfigurably shape the complex surface impedance. As a proof-of-concept step, we fabricate several metasurface instances with static loads in different configurations (surface mount capacitors and resistors of different values in different connection topologies) to validate the approach and showcase the different achievable functionalities. Specifically, we show perfect absorption for oblique incidence (both polarizations), broadband linear-polarization conversion, and beam splitting, demonstrating control over the amplitude, polarization state, and wave front, respectively. Measurements are performed in the 4-18-GHz range inside an anechoic chamber and show good agreement with theoretically anticipated results. Our results clearly demonstrate the practical potential of the proposed architecture for reconfigurable electromagnetic wave manipulation.
  • Programmable Metasurfaces: State of the Art and Prospects
    (2018) Liu, Fu; Pitilakis, A.; Mirmoosa, Mohammad; Tsilipakos, O.; Wang, Xuchen; Tasolamprou, A. C.; Abadal, S.; Cabellos-Aparicio, A.; Alarcón, E.; Liaskos, C.; Kantartzis, N. V.; Kafesaki, M.; Economou, E. N.; Soukoulis, C. M.; Tretyakov, Sergei
     A4 Artikkeli konferenssijulkaisussa
    Metasurfaces, ultrathin and planar electromagnetic devices with sub-wavelength unit cells, have recently attracted enormous attention for their powerful control over electromagnetic waves, from microwave to visible range. With tunability added to the unit cells, the programmable metasurfaces enable us to benefit from multiple unique functionalities controlled by external stimuli. In this review paper, we will discuss the recent progress in the field of programmable metasurfaces and elaborate on different approaches to realize them, with the tunability from global aspects, to local aspects, and to software-defined metasurfaces.
  • Software-Defined Metasurface Paradigm: Concept, Challenges, Prospects
    (2018-11-13) Pitilakis, A.; Tasolamprou, A. C.; Liaskos, C.; Liu, F.; Tsilipakos, O.; Wang, X.; Mirmoosa, M. S.; Kossifos, K.; Georgiou, J.; Pitsilides, A.; Kantartzis, N. V.; Ioannidis, S.; Economou, E. N.; Kafesaki, M.; Tretyakov, S. A.; Soukoulis, C. M.
     A4 Artikkeli konferenssijulkaisussa
    HyperSurfaces (HSFs) are devices whose electromagnetic (EM) behavior is software-driven, i.e., it can be defined programmatically. The key components of this emerging technology are the metasurfaces, artificial layered materials whose EM properties depend on their internal subwavelength structuring. HSFs merge metasurfaces with a network of miniaturized custom electronic controllers, the nanonetwork, in an integrated scalable hardware platform. The nanonetwork receives external programmatic commands expressing the desired end-functionality and appropriately alters the metasurface configuration thus yielding the respective EM behavior for the HSF. In this work, we will present all the components of the HSF paradigm, as well as highlight the underlying challenges and future prospects.
  • Tunable Perfect Anomalous Reflection in Metasurfaces with Capacitive Lumped Elements
    (2018-11-13) Tsilipakos, O.; Liu, F.; Pitilakis, A.; Tasolamprou, A. C.; Kwon, D. H.; Mirmoosa, M. S.; Kantartzis, N. V.; Economou, E. N.; Kafesaki, M.; Soukoulis, C. M.; Tretyakov, S. A.
     A4 Artikkeli konferenssijulkaisussa
    We demonstrate tunable perfect anomalous reflection with metasurfaces incorporating lumped elements. The tunable capacitance of each element provides continuous control over the local surface reactance, allowing for controlling the evanescent field distribution and efficiently tilting the reflected wavefront away from the specular direction. The performance of the metasurface is evaluated for both TE and TM polarization and for reflection to the first and second diffraction order.