V. A. Fedotov

Publications (73)179.15 Total impact

• Article: Electro-optical control in a plasmonic metamaterial hybridised with a liquid-crystal cell.

  O Buchnev, J Y Ou, M Kaczmarek, N I Zheludev, V A Fedotov
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  ABSTRACT: We experimentally demonstrate efficient electro-optical control in an active nano-structured plasmonic metamaterial hybridised with a liquid-crystal cell. The hybridisation was achieved by simultaneously replacing the polarizer, transparent electrode and molecular alignment layer of the liquid-crystal cell with the metamaterial nano-structure. With the control signal of only 7 V we have achieved a fivefold hysteresis-free modulation of metamaterial transmission at the wavelength of 1.55 µm.
  Optics Express 01/2013; 21(2):1633-8. · 3.59 Impact Factor
• Article: Modulating Sub-THz Radiation with Current in Superconducting Metamaterial.

  V Savinov, V A Fedotov, S M Anlage, P A J de Groot, N I Zheludev
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  ABSTRACT: We show that subterahertz transmission of the superconducting metamaterial, an interlinked two-dimensional network of subwavelength resonators connected by a continuous superconducting wire loop, can be dynamically modulated by passing electrical current through it. We have identified the main mechanisms of modulation that correspond to the suppression of the superconductivity in the network by magnetic field and heat dissipation. Using the metamaterial fabricated from thin niobium film, we were able to demonstrate a transmission modulation depth of up to 45% and a bandwidth of at least 100 kHz. The demonstrated approach may be implemented with other superconducting materials at frequencies below the superconducting gap in the THz and subterahertz bands.
  Physical Review Letters 12/2012; 109(24):243904. · 7.37 Impact Factor
• Article: Non-Trivial Non-Radiating Excitation as a Mechanism of Resonant Transparency in Toroidal Metamaterials

  V. A. Fedotov, A. V. Rogacheva, V. Savinov, D. P. Tsai, N. I. Zheludev
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  ABSTRACT: We demonstrate theoretically and confirm experimentally a new mechanism of resonant electromagnetic transparency, which yields extremely narrow isolated symmetric Lorentzian lines of full transmission in metamaterials. It exploits the long sought non-trivial non-radiating charge-current excitation based on toroidal dipole moment, predicted to generate waves of gauge-irreducible vector potential in the complete absence of scattered electromagnetic fields.
  11/2012;
• Source

  Available from: PubMed Central

  Article: Flux exclusion superconducting quantum metamaterial: towards quantum-level switching.

  V Savinov, A Tsiatmas, A R Buckingham, V A Fedotov, P A J de Groot, N I Zheludev
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  ABSTRACT: Nonlinear and switchable metamaterials achieved by artificial structuring on the subwavelength scale have become a central topic in photonics research. Switching with only a few quanta of excitation per metamolecule, metamaterial's elementary building block, is the ultimate goal, achieving which will open new opportunities for energy efficient signal handling and quantum information processing. Recently, arrays of Josephson junction devices have been proposed as a possible solution. However, they require extremely high levels of nanofabrication. Here we introduce a new quantum superconducting metamaterial which exploits the magnetic flux quantization for switching. It does not contain Josephson junctions, making it simple to fabricate and scale into large arrays. The metamaterial was manufactured from a high-temperature superconductor and characterized in the low intensity regime, providing the first observation of the quantum phenomenon of flux exclusion affecting the far-field electromagnetic properties of the metamaterial.
  Scientific Reports 01/2012; 2:450.
• Article: Metamaterial polarization spectral filter: Isolated transmission line at any prescribed wavelength

  N. I. Zheludev, E. Plum, V. A. Fedotov
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  ABSTRACT: We demonstrate that a narrowband spectral filter with a ripples-free isolated transmission peak and wide acceptance angle can be constructed exploiting polarization properties of a metal film patterned on the subwavelength scale. Its transmission band can be engineered to be anywhere from the visible to microwaves.
  Applied Physics Letters 10/2011; 99(17):171915-171915-3. · 3.84 Impact Factor
• Conference Proceeding: Demonstrating elusive toroidal dipolar response in metamaterials

  V.A. Fedotov, T. Kaelberer, N. Papasimakis, V. Savinov, A.V. Rogacheva, D.P. Tsai, N.I. Zheludev
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  ABSTRACT: We demonstrate examples of classical systems, namely metamaterials, the electromagnetic response of which can be directly related to the resonant excitation of the toroidal dipole moment.
  Lasers and Electro-Optics Europe (CLEO EUROPE/EQEC), 2011 Conference on and 12th European Quantum Electronics Conference; 06/2011
• Article: Angular electromagnetic response of double-ring metamaterials for TE polarization

  J H Shi, N Papasimakis, V A Fedotov, Z P Wang, N I Zheludev
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  ABSTRACT: We investigate transmission characteristics in symmetric planar double-ring metamaterials at oblique angles of incidence theoretically. The double-ring microwave metamaterials are used to study resonant response to incident TE electromagnetic wave. The trapped-mode resonant feature results from the excitation of antisymmetric current mode and the quality factor is associated to the angle of incidence.
  Journal of Physics Conference Series 03/2011; 276(1):012086.
• Source

  Available from: soton.ac.uk

  Article: Asymmetric transmission: a generic property of two-dimensional periodic patterns

  E Plum, V A Fedotov, N I Zheludev
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  ABSTRACT: Asymmetric transmission of circularly polarized waves is a well-established property of lossy, anisotropic, two-dimensionally chiral patterns. Here we show that asymmetric transmission can be observed for oblique incidence onto any lossy periodically structured plane. Our results greatly expand the range of natural and artificial materials in which directionally asymmetric transmission can be expected, making it a cornerstone electromagnetic effect rather than a curiosity of planar chiral metamaterials. Prime candidates for asymmetric transmission at oblique incidence are rectangular arrays of plasmonic spheres or semiconductor quantum dots, lossy double-periodic gratings and planar metamaterial structures.
  Journal of optics 11/2010; 13(2):024006. · 1.57 Impact Factor
• Source

  Available from: nanophotonics.org.uk

  Article: Toroidal dipolar response in a metamaterial.

  T Kaelberer, V A Fedotov, N Papasimakis, D P Tsai, N I Zheludev
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  ABSTRACT: Toroidal multipoles are fundamental electromagnetic excitations different from those associated with the familiar charge and magnetic multipoles. They have been held responsible for parity violation in nuclear and particle physics, but direct evidence of their existence in classical electrodynamics has remained elusive. We report on the observation of a resonant electromagnetic response in an artificially engineered medium, or metamaterial, that cannot be attributed to magnetic or charge multipoles and can only be explained by the existence of a toroidal dipole. Our direct experimental evidence of the toroidal response brings attention to the often ignored electromagnetic interactions involving toroidal multipoles, which could be present in naturally occurring systems, especially at the macromolecule level, where toroidal symmetry is ubiquitous.
  Science 11/2010; 330(6010):1510-2. · 31.20 Impact Factor
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  Available from: ArXiv

  Article: A combinatorial approach to metamaterials discovery

  E. Plum, K. Tanaka, W. T. Chen, V. A. Fedotov, D P Tsai, N I Zheludev
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  ABSTRACT: We report a high through-put combinatorial approach to photonic metamaterial optimization. The new approach is based on parallel synthesis and consecutive optical characterization of large numbers of spatially addressable nano-fabricated metamaterial samples (libraries) with quasi-continuous variation of design parameters under real manufacturing conditions. We illustrate this method for Fano-resonance plasmonic nanostructures arriving at explicit recipes for high quality factors needed for switching and sensing applications. Comment: 4 pages, 3 figures
  09/2010;
• Source

  Available from: ArXiv

  Article: Asymmetric transmission: a generic property of lossy periodic interfaces

  E. Plum, V. A. Fedotov, N I Zheludev
  [show abstract] [hide abstract]
  ABSTRACT: Asymmetric transmission of circularly polarized waves is a well-established property of lossy, anisotropic, two-dimensionally chiral patterns. Here we show that asymmetric transmission can be observed for oblique incidence onto any lossy periodically structured plane. Our results greatly expand the range of natural and artificial materials in which directionally asymmetric transmission can be expected making it a cornerstone electromagnetic effect rather than a curiosity of planar chiral metamaterials. Prime candidates for asymmetric transmission at oblique incidence are rectangular arrays of plasmonic spheres or semiconductor quantum dots, lossy double-periodic gratings and planar metamaterial structures. Comment: 9 pages, 4 figures
  07/2010;
• Source

  Available from: arxiv.org

  Article: Metamaterial optical diodes for linearly and circularly polarized light

  E. Plum, V. A. Fedotov, N I Zheludev
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  ABSTRACT: The total intensity of light transmitted at non-normal incidence thorough planar metamaterials can be different for forward and backward propagation. For metamaterial patterns of different symmetries we observe this effect for circularly or linearly polarized light. Comment: 2 pages, 2 figures
  06/2010;
• Article: Spectral collapse in ensembles of metamolecules.

  V A Fedotov, N Papasimakis, E Plum, A Bitzer, M Walther, P Kuo, D P Tsai, N I Zheludev
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  ABSTRACT: We report on the first direct experimental demonstration of a collective phenomenon in metamaterials: spectral line collapse with an increasing number of unit cell resonators (metamolecules). This effect, which is crucial for achieving a lasing spaser, a coherent source of optical radiation fuelled by coherent plasmonic oscillations in metamaterials, is linked to the suppression of radiation losses in periodic arrays. We experimentally demonstrate spectral line collapse at microwave, terahertz and optical frequencies.
  Physical Review Letters 06/2010; 104(22):223901. · 7.37 Impact Factor
• Source

  Available from: nanophotonics.org.uk

  Article: Temperature control of Fano resonances and transmission in superconducting metamaterials.

  V A Fedotov, A Tsiatmas, J H Shi, R Buckingham, P de Groot, Y Chen, S Wang, N I Zheludev
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  ABSTRACT: Losses are the main evil that limits the use of metamaterials in practical applications. While radiation losses may be controlled by design, Joule losses are hereditary to the metamaterial structures. An exception is superconducting metamaterials, where Joule losses can be uniquely controlled with temperature in a very wide range. We put this in use by demonstrating temperature-dependent transmission in the millimeter-wave part of the spectrum in high-Tc superconducting cuprate metamaterials supporting sub-radiant resonances of Fano type.
  Optics Express 04/2010; 18(9):9015-9. · 3.59 Impact Factor
• Source

  Available from: ArXiv

  Article: Superconducting plasmonics and extraordinary transmission

  A. Tsiatmas, R. Buckingham, V. A. Fedotov, S Wang, Y Chen, P. de Groot, N I Zheludev
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  ABSTRACT: Negative dielectric constant and dominant kinetic resistance make superconductors an intriguing plasmonic media. Here we report on the first study of one of the most important and disputed manifestations of plasmonics, the effect of extraordinary transmission through an array of sub-wavelength holes, using a perforated film of high-temperature superconductor. Comment: 3 page, 3 figures
  04/2010;
• Article: Fano Resonances in High-Tc Superconducting Metamaterial

  V. A. Fedotov, J. -H. Shi, A. Tsiatmas, P. de Groot, Y Chen, N I Zheludev
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  ABSTRACT: We demonstrate a millimeter-wave range metamaterial fabricated from cuprate superconductor. Two complementary metamaterial structures have been studied, which exhibit Fano resonances emerging from the collective excitation of interacting magnetic and electric dipole modes. Comment: 2 pages, 2 figures
  01/2010;
• Source

  Available from: ArXiv

  Article: Spectral collapse in ensembles of meta-molecules

  V. A. Fedotov, N. Papasimakis, E. Plum, A. Bitzer, M Walther, P Kuo, D P Tsai, N I Zheludev
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  ABSTRACT: We report on a new collective phenomenon in metamaterials: spectral line collapse with increasing number of the unit cell resonators (meta-molecules). Resembling the behaviour of exotic states of matter, such as Bose-Einstein condensates of excitons and magnons, this new effect is linked to the suppression of radiation losses in periodic arrays. We demonstrate experimentally spectral line collapse at microwave, terahertz and optical frequencies. It emerges as a universal and truly scalable effect underpinned by classical electromagnetic interactions between the excited meta-molecules. Comment: 5 pages, 5 figures
  08/2009;
• Article: Gyrotropy of a metamolecule: wire on a torus.

  N Papasimakis, V A Fedotov, K Marinov, N I Zheludev
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  ABSTRACT: Sharing topology with numerous organic molecules, a wire helix bend into a torus gives a curious object with a gyrotropic behavior which is far from obvious. While a continuous constant current in opposite sections of the torus would create mutually cancelling contributions to its gyrotropic response, an array of tori can show strong circular dichroism linked to the excitation of standing current waves. Here we present the experimental study of optical activity in a chiral toroidal metamaterial and discuss its response in terms of multipole moments, including the elusive toroidal moment.
  Physical Review Letters 08/2009; 103(9):093901. · 7.37 Impact Factor
• Conference Proceeding: Metamaterial analogue of the Mössbauer effect

  V.A. Fedotov, N. Papasimakis, A. Bitzer, M. Walther, N.I. Zheludev
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  ABSTRACT: The behavior of an electromagnetic metamaterial that presents a phenomenological analogue of the Mossbauer effect was reported, where the metamaterial resonance becomes narrower and stronger with increasing number of meta-molecules in the array structure, similarly to how the broad gamma-emission line collapses in crystalline media.
  Lasers and Electro-Optics 2009 and the European Quantum Electronics Conference. CLEO Europe - EQEC 2009. European Conference on; 07/2009
• Source

  Available from: soton.ac.uk

  Article: Towards the lasing spaser: controlling metamaterial optical response with semiconductor quantum dots.

  E Plum, V A Fedotov, P Kuo, D P Tsai, N I Zheludev
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  ABSTRACT: We report the first experimental demonstration of compensating Joule losses in metallic photonic metamaterial using optically pumped PbS semiconductor quantum dots.
  Optics Express 06/2009; 17(10):8548-51. · 3.59 Impact Factor