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We propose from the first time a practical way of generating flying electromagnetic doughnuts, ultra-short electromagnetic pulses that are exact solutions to Maxwell's equations, distinguished by a doughnut-like configuration of electric and magnetic fields, strong longitudinal field components along the propagation direction, and unique spatiotemporal coupling [1, 2]. Flying doughnuts (FDs) are single-cycle,...
The chalcogenides represent a unique material platform, capable of providing high-index dielectric, plasmonic, ‘epsilon-near-zero’ (ENZ) or topological insulator properties when the constituent elements are combined in the right proportion. Moreover, they can exhibit reversible, non-volatile structural transitions between solid phases with vastly different electromagnetic properties. We report here...
We show for the first time that, contrary to common expectations, transition to superconductivity affects plasmonic behaviour of niobium at optical frequencies. This result is unexpected as photon energy is orders of magnitude higher than the binding energy of the Cooper pairs, the superconducting charge carriers.
The next frontier of nanophotonics research is to develop metamaterials with on-demand optical properties that may be independently controlled at any given point in space and at any moment of time. We will overview emerging technologies for meta-molecular level switching controlled by electric or magnetic signals and light.
Vertical split-ring resonators (VSRRs) were fabricated which behave as magnetic metamolecules sensitive to both incident electric and magnetic fields with the stronger induced magnetic dipole moments upon excitation in comparison to planar SRRs. Using these metamolecules with different spacing in VSRR dimers, we investigate the hybridization of the magnetic plasmon modes associated with each constituent...
We demonstrate experimentally and numerically the first ever observation of optical activity in a chiral metamaterial that is underpinned by the exotic resonant combination of an electric quadrupole and the elusive toroidal dipole.
We demonstrate high-density, multi-level crystallization of a Ge2Sb2Te5 thin film using tightly focused femtosecond laser pulses. The optical reflectivity in each distinct phase states level is characterized for applications in ultra-fast cognitive parallel data processing.
Optically pumped gold nanowire, 330 nm in diameter imbedded into silicate optical fiber produces broadband, highly collimated radiation (in the range 470–900 nm) with divergence of less than 4 mrad.
We report on the electromagnetic properties of the single-cycle “flying doughnut” electromagnetic permutations in the context of their interactions with nanoscale objects, such as dielectric and plasmonic nanoparticles.
We experimentally demonstrate a family of compact and efficient IR and THz electro-optical modulators based on active planar metamaterials (metasurfaces) hybridised with liquid crystals.
We present a superconducting metamaterial with ultra-strong nonlinear response in the sub-terahertz range. A change in transmission of more than 10% has been achieved by ramping up the radiation intensity from 100µW/cm2 to just 800µW/cm2.
We report for the first time an order of magnitude enhancement of Kerr rotation in hybrid plasmonic/ferromagnetic metamaterial resonators. Our results pave the way towards magnetically controlled metamaterials and integrated magneto-plasmonics.
Optical axons and photonic synapses implemented using chalcogenide microfibers allow the generation and propagation of photonic action potentials which give rise to the demonstration of various neuromorphic concepts.
Frequency selective surfaces are very well known and have been investigated in detail. Here we for the first time introduce the concept of a wavevector selective surface and demonstrate it experimentally.
We demonstrate the first superconducting metamaterial that can exhibit a profound toroidal dipolar resonance. Quantum behaviour of the superconductor and toroidal excitation of the metamaterial are both necessary prerequisites for observing the time-dependent Aharonov-Bohm effect.
Surface-driven metallization in a nanoscale layer of elemental gallium forming the backplane of a photonic metamaterial absorber provides a mechanism for reversible all-optical and thermo-optical tuning of resonant response.
We present ultrathin multilayer metamaterial absorbers based on abundant, low-cost materials, to effectively harness solar energy for heating and evaporation of water.
A long chase for the elusive dynamic toroidal moments has been recently concluded by detecting a spectral signature of the toroidal dipolar resonance in the response of a specially designed electromagnetic metamaterial [1]. This observation brings up a new interest to the prediction made by Afanasiev and Stepanovsky in 1994 that a combination of oscillating toroidal and conventional electric dipoles...
The study of ultrafast magnetic phenomena underpinning the development of data storage technologies requires increasingly high spatial and temporal resolution. However, to date there is no easily accessible method that meets these criteria. Here we introduce a plasmonic source that allows for direct generation of unipolar, sub-ps, Tesla-scale magnetic pulses localized at the nanoscale.
Graphene has emerged as a novel plasmonic material with advantageous properties for metamaterial design, such as highly confined plasmons and fast electrical tuning by carrier injection. Here, we predict strong magnetic dipole response by graphene split nanorings at THz frequencies allowing to achieve metamaterials with a high degree of field confinement (-one hundredth of the excitation wavelength)...
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