A5029406795- Metamaterials and Metasurfaces Applications
- Photonic and Optical Devices
- Advanced Antenna and Metasurface Technologies
- Plasmonic and Surface Plasmon Research
- Antenna Design and Analysis
- Advanced Fiber Laser Technologies
- Photonic Crystals and Applications
- Advanced Fiber Optic Sensors
- Mechanical and Optical Resonators
- Optical Network Technologies
- Advanced Wireless Communication Technologies
- Laser Material Processing Techniques
- Energy Harvesting in Wireless Networks
- Microwave Engineering and Waveguides
- Silk-based biomaterials and applications
- Nanofabrication and Lithography Techniques
- Terahertz technology and applications
- Neurobiology and Insect Physiology Research
- Optical Coatings and Gratings
- Semiconductor Lasers and Optical Devices
- Modular Robots and Swarm Intelligence
- 3D Shape Modeling and Analysis
- Millimeter-Wave Propagation and Modeling
- Semiconductor Quantum Structures and Devices
- Opportunistic and Delay-Tolerant Networks
Foundation for Research and Technology Hellas
2016-2025
National Hellenic Research Foundation
2022-2025
FORTH Institute of Electronic Structure and Laser
2016-2023
FORTH Institute of Computer Science
2019
Aristotle University of Thessaloniki
2009-2016
Abstract Metasurfaces, the ultrathin, 2D version of metamaterials, have recently attracted a surge attention for their capability to manipulate electromagnetic waves. Recent advances in reconfigurable and programmable metasurfaces greatly extended scope reach into practical applications. Such functional sheet materials can enormous impact on imaging, communication, sensing applications, serving as artificial skins that shape fields. Motivated by these opportunities, this progress report...
Electro-optic modulators are an indispensable part of photonic communication systems, largely dictating the achievable transmission rate. Recent advances in materials and fabrication/processing techniques have brought new elements a renewed dynamic to research on optical modulation. Motivated by opportunities, this Perspective reviews state art integrated electro-optic modulators, covering broad range contemporary platforms. To provide better overview status current assessment different...
How might one make metasurfaces ``intelligent'', to offer multiple reconfigurable functions? The authors show that it can be done by embedding individually addressable tunable chips (mixed-signal integrated circuits) in each unit cell. This enables independent, continuous control of both the resistive and reactive parts local complex surface impedance. allows a broader range functionalities, among which arbitrary-angle perfect absorption anomalous reflection are showcased this study. Further...
In this paper we present the theoretical considerations and design evolution of a proof-of-concept reconfigurable metasurface, primarily used as tunable microwave absorber, but also wavefront manipulation polarization conversion device in reflection. We outline all taken into account, from selection patch shape, unit cell size, substrate, to topology structure that realizes desired tunability. The presented conforms fabrication restrictions is co-designed work with an integrated circuit chip...
Metasurfaces, ultrathin and planar electromagnetic devices with sub-wavelength unit cells, have recently attracted enormous attention for their powerful control over waves, from microwave to visible range. With tunability added the programmable metasurfaces enable us benefit multiple unique functionalities controlled by external stimuli. In this review paper, we will discuss recent progress in field of elaborate on different approaches realize them, global aspects, local software-defined...
We provide a critical overview of recent advances in all-dielectric, strongly resonant and gradient metasurfaces, as their performance is pushed to the extreme view emerging flat-optics applications.
Abstract In this article, the impact of excited electromagnetic surface modes in a comprehensive investigation formation laser‐induced periodic structures (LIPSS) is analyzed. It demonstrated that origin low spatial‐frequency LIPSS (LSFL) frequency detuning between propagating and localized due to their coupling/hybridization. The influence pattern profile, inhomogeneity, material type on coupling strength, electric‐field spatial distribution, associated near‐field scattering are...
Temporal coupled-mode theory (CMT) is an acclaimed and widely used theoretical framework for modeling the continuous-wave response temporal dynamics of any integrated or free-space photonic resonant structure. It was initially employed to understand how energy coupled into out a cavity it exchanged between different modes. In 30 years that followed its establishment, CMT has been expanded describe broad range nonlinear interactions as well (self- cross-phase modulation, saturable absorption,...
Abstract A novel approach for reconfigurable wavefront manipulation with gradient metasurfaces based on permittivity‐modulated elliptic dielectric rods is proposed. It shown that the required 2π phase span in local electromagnetic response of metasurface can be achieved by pairing lowest magnetic dipole Mie resonance a toroidal resonance, instead using two resonances corresponding to fundamental electric and as customarily exercised. This allows precise matching both frequencies quality...
Software-defined metasurfaces are electromagnetically ultra-thin, artificial components that can provide engineered and externally controllable functionalities. The control over these functionalities is enabled by the metasurface tunability, which implemented embedded electronic circuits modify locally surface resistance reactance. Integrating controllers within able them to intercommunicate adaptively reconfigure, thus imparting a desired electromagnetic operation, opens path towards...
Programmable metasurfaces have garnered significant attention as they confer unprecedented control over the electromagnetic (EM) response of any surface. Such feature has given rise to novel design paradigms such Software-Defined Metamaterials (SDM) and Reconfigurable Intelligent Surfaces (RIS) with multiple groundbreaking applications. However, development programmable tailored particularities a potentially large application pool becomes daunting task because space remarkably large. This...
We present a thorough investigation of the electromagnetic resonant modes supported by systems polaritonic rods placed at vertices canonical polygons. The study is conducted with rigorous finite-element eigenvalue simulations. To provide physical insight, simulations are complemented coupled mode theory (the analog LCAO in molecular and solid state physics) lumped wire model capturing coupling-caused reorganizations currents each rod. rods, which form all-dielectric cyclic metamolecules,...
The next generation of wireless networks is expected to tap into the terahertz (0.1--10 THz) band satisfy extreme latency and bandwidth density requirements future applications. However, development systems in this challenging as THz waves confront severe spreading penetration losses, well molecular absorption, which leads strong line-of-sight through highly directive antennas. Recently, reconfigurable intelligent surfaces (RISs) have been proposed address issues derived from...
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, multi-functional reconfigurable metasurface can be realized, capable full incident radiation. Here, we experimentally validate architecture for microwave regime, where in principle variable loads are connected behind backplane reconfigurably shape complex surface impedance. As...
Microring resonator filters, which are made of dielectric-loaded surface plasmon polariton waveguides and operate in the telecom spectral range, thoroughly analyzed by means vectorial three dimensional (3D) finite element method (FEM) simulations. The filters’ functional characteristics, such as resonant frequencies where transmission minima occur, free extinction ratio, linewidth associated with quality factor resonances, investigated for different values key structural parameters, namely,...
We demonstrate an efficient thermo-optic dielectric loaded surface plasmon polariton waveguide (DLSPPW) 2 × switch using a high coefficient polymer and dual mode interference configuration. Unlike previous configurations relying on single-mode circuitry, the we consider is based between plasmonic low-damping photonic of DLSPPW, thus leading to minimization insertion losses device. Switching extinction ratios 7 dB are measured for compact 119 μm-long The overall device performances in good...
We demonstrate a 2 <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$\,\times\,$</tex> </formula> silicon-plasmonic router architecture with 320 Gb/s throughput capabilities for optical interconnect applications. The proposed platform relies on novel dual-ring Dielectric-Loaded Surface Plasmon Polariton (DLSPP) Notation="TeX">$\,\times\,$</tex></formula> switch heterointegrated Silicon-on-Insulator...
A general framework combining perturbation theory and coupled-mode is developed for analyzing nonlinear resonant structures comprising dispersive bulk sheet materials. To allow conductive materials, a current term introduced in the formulation addition to more common polarization. The applied model bistability graphene-based traveling-wave resonator system exhibiting third-order nonlinearity. We show that complex conductivity of graphene disturbs equality electric magnetic energies on...
Metasurfaces impart phase discontinuities on impinging electromagnetic waves that are typically limited to 0–2π. Here, we demonstrate multiresonant metasurfaces can break free from this limitation and supply arbitrarily large, tunable time delays over ultrawide bandwidths. As such, ultrathin act as the equivalent of thick bulk structures by emulating multiple geometric resonances three-dimensional systems originate accumulation with effective material implemented surface itself via suitable...
Tunable metasurfaces are ultra-thin, artificial electromagnetic components that provide engineered and externally adjustable functionalities. The programmable metasurface, the HyperSurFace, concept consists in integrating controllers within metasurface interact locally communicate globally to obtain a given behaviour. Here, we address design constraints introduced by both functions accommodated i.e., desired operation unit cells wireless communication enabling such functionality. process for...
The realization of a programmable metasurface, enabled by custom application-specific integrated circuit (ASIC), is presented in this paper. ASIC used to provide an adaptive complex impedance load each the metasurface unit cells. Various technology nodes are analyzed for implementation tunable loading elements before one selected final implementation, which four loads placed within circuit, and controlled two digital-to-analog converters. Furthermore, ASICs populate back form mesh network...
By implementing multiple sharp resonances on a single metasurface, one can combine the strong delay of constituent along with broad aggregate bandwidth resonance ensemble, "tricking" delay-bandwidth limit. Ensuring that group is spectrally constant across bandwidth, we arbitrarily broadband pulses without distortion. Here, demonstrate concrete experimental implementation an achromatic time metasurface in reflection by fitting five resonant meta-atoms subwavelength unit cell to provide...
Multi-photon lithography -a powerful laser nanoscale additive-manufacturing method- is employed for structuring micro-ring traveling-wave resonators onto micrometric diameter, optical fiber tapers. These weakly guided, resonating structures achieve light circulation with Q-factors of the order ∼2.0 × 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> , typical diameters tens micrometers, in spectral band 1550 nm. The parametrization...
A comprehensive theoretical analysis of end-fire coupling between dielectric-loaded surface plasmon polariton and rib/wire silicon-on-insulator (SOI) waveguides is presented. Simulations are based on the 3-D vector finite element method. The geometrical parameters interface varied in order to identify ones leading optimum performance, i.e., maximum efficiency. Fabrication tolerances about parameter values also assessed. In addition, effect a longitudinal metallic stripe gap efficiency...
Structuring metal surfaces on the nanoscale has been shown to alter their fundamental processes like reflection or absorption by supporting surface plasmon resonances. Here, we propose films with subwavelength rectangular nanostructuring that perfectly absorb incident radiation in optical regime. The structures are fabricated low-cost nanoimprint lithography and thus constitute an appealing alternative elaborate absorber designs complex meta-atoms multilayer structuring. We conduct a...