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Now showing items 1-20 of 20

  • Angle-independent microwave absorption by ultrathin microcavity arrays 

    Brown, James R.; Hibbins, Alastair P.; Lockyear, Matthew J.; Lawrence, Christopher R.; Sambles, J. Roy (American Institute of Physics, 2008)
    The resonant absorption of microwave radiation by thin, two-dimensional microcavity arrays has been studied. Resonant modes associated with these structures, formed from copper-clad FR4 laminates, exhibit both an azimuthal ...
  • Coupled surface-plasmon-like modes between metamaterial 

    Hibbins, Alastair P.; Lockyear, Matthew J.; Sambles, J. Roy (American Physical Society, 2007)
    Perfectly conducting metals may be structured with holes to make metamaterials that support surface-plasmon-like modes at microwave frequencies. Results are presented for Fabry-Pérot-like standing wave resonances formed ...
  • Enhanced microwave transmission through a patterned metal film 

    Kelly, Robert J.; Lockyear, Matthew J.; Suckling, James R.; Sambles, J. Roy; Lawrence, Christopher R. (American Institute of Physics, 2007)
    Selective transmission of radiation through a two-dimensional array of subwavelength slits in an otherwise opaque thin metal film is presented at microwave frequencies. Individual slits are modified with the addition of ...
  • Finite conductance governs the resonance transmission of thin metal slits at microwave frequencies 

    Suckling, James R.; Hibbins, Alastair P.; Lockyear, Matthew J.; Preist, T. W.; Sambles, J. Roy; Lawrence, Christopher R. (American Physical Society, 2004)
    Fabry-Perot–like resonant transmission of microwave radiation through a single subwavelength slit in a thick aluminum plate is quantified for a range of slit widths. Surprisingly, and in contrast to previous studies [e.g., ...
  • Low angular-dispersion microwave absorption of a dual-pitch nondiffracting metal bigrating 

    Lockyear, Matthew J.; Hibbins, Alastair P.; Sambles, J. Roy; Lawrence, Christopher R. (American Institute of Physics, 2003)
    The surface plasmon modes supported by a nondiffracting 90° bigrating consisting of three grooves per repeat period with one slightly shallower than the other two are characterized by studying the reflectivity from the ...
  • Low angular-dispersion microwave absorption of a metal dual-period nondiffracting hexagonal grating 

    Lockyear, Matthew J.; Hibbins, Alastair P.; Sambles, J. Roy; Lawrence, Christopher R. (American Institute of Physics, 2005)
    The microwave (11.3<λ0<16.7 mm) reflectivity response of a nondiffracting dual-period hexagonal grating is explored. In three directions at 60° to each other, the aluminum grating has a repeat period of 7.2 mm in which ...
  • Microwave surface-plasmon-like modes on thin metamaterials 

    Lockyear, Matthew J.; Hibbins, Alastair P.; Sambles, J. Roy (American Physical Society, 2009)
    It has recently been shown that the structured surface of a perfect conductor can support surface-plasmon-like modes [Pendry et al., Science 305, 847 (2004)]. Such structures have a thickness of at least the order of the ...
  • Microwave transmission of a compound metal grating 

    Hibbins, Alastair P.; Hooper, Ian R.; Lockyear, Matthew J.; Sambles, J. Roy (American Physical Society, 2006)
    An array of subwavelength slits in a metallic substrate supports a series of Fabry-Perot-like resonances, where each harmonic results in a transmission peak. Addition of extra slits per period yields a compound grating ...
  • Microwave transmission through a single subwavelength annular aperture in a metal plate 

    Lockyear, Matthew J.; Hibbins, Alastair P.; Sambles, J. Roy; Lawrence, Christopher R. (American Physical Society, 2005)
    The resonant transmission of a small annular aperture, with a diameter much smaller than the radiation wavelength, in a thin metal plate is studied at microwave frequencies. It transpires that such an annular aperture ...
  • One-way diffraction grating 

    Lockyear, Matthew J.; Hibbins, Alastair P.; White, Kevin R.; Sambles, J. Roy (American Physical Society, 2006)
    Diffraction gratings are elementary tools for much of optics and spectroscopy. Here, at microwave frequencies, we provide a new perspective on these fundamental structures. A transmission diffraction grating is presented ...
  • Optical Control over Surface-Plasmon-Polariton-Assisted THz Transmission through a Slit Aperture 

    Hendry, Euan; Garcia-Vidal, F. J.; Martin-Moreno, L.; Gómez Rivas, J.; Bonn, Mischa; Hibbins, Alastair P.; Lockyear, Matthew J. (American Physical Society, 2008)
    We demonstrate optical control over the transmission of terahertz (THz) radiation through a single subwavelength slit in an otherwise opaque silicon wafer. The addition of periodic corrugation on each side of the wafer ...
  • Prism coupling to 'designer' surface plasmons 

    Hibbins, Alastair P.; Hendry, Euan; Lockyear, Matthew J.; Sambles, J. Roy (Optical Society of America, 2008)
    The excitation of ‘designer’ surface-plasmon-like modes on periodically perforated metals is demonstrated at microwave frequencies using the classical method of prism coupling. In addition we provide a complete formalism ...
  • The resonant electromagnetic fields of an array of metallic slits acting as Fabry-Perot cavities 

    Hibbins, Alastair P.; Lockyear, Matthew J.; Sambles, J. Roy (American Institute of Physics, 2006)
    Fabry-Perot cavities are perhaps the best known of the optical transmission resonators, with cavity field enhancement accomplished by two parallel and partially reflecting planes. Recently it has been shown that arrays of ...
  • Surface plasmons on metamaterials 

    Hibbins, Alastair P.; Lockyear, Matthew J.; Sambles, J. Roy (SPIE, 2008)
    The field of plasmonics has historically been a playground exclusively for the optics community. Primarily this is because the response of metals becomes dominated by their large conductivities at much lower frequencies, ...
  • Surface-topography-induced enhanced transmission and directivity of microwave radiation through a subwavelength circular metal aperture 

    Lockyear, Matthew J.; Hibbins, Alastair P.; Sambles, J. Roy; Lawrence, Christopher R. (American Institute of Physics, 2004)
    Strongly enhanced transmission of microwave radiation (λ0~5 mm) is observed through a single subwavelength circular aperture of diameter d = 2.5 mm in a metallic plate. The phenomenon is caused by resonant excitation of ...
  • Thin resonant structures for angle and polarization independent microwave absorption 

    Lockyear, Matthew J.; Hibbins, Alastair P.; Sambles, J. Roy; Hobson, Peter A.; Lawrence, Christopher R. (American Institute of Physics, 2009)
    We present a microwave absorbing structure comprised of an array of subwavelength radius copper disks, closely spaced from a ground plane by a low loss dielectric. Experiments and accompanying modeling demonstrate that ...
  • Transmission of microwave radiation through a sub-wavelength slit with internal structure 

    Lockyear, Matthew J.; Hibbins, Alastair P.; Sambles, J. Roy (SPIE, 2008)
    Fabry-Perot cavities are perhaps the best known of the optical transmission resonators, with cavity field enhancement accomplished by two parallel and partially reflecting planes. Recently it has been shown that arrays of ...
  • Transmission of microwaves through a stepped subwavelength slit 

    Lockyear, Matthew J.; Hibbins, Alastair P.; Sambles, J. Roy (American Institute of Physics, 2007)
    The transmission of normally incident plane wave microwaves through a single stepped subwavelength slit in a thick metal plate is explored. The presence of the step substantially increases the radiation wavelength which ...
  • Ultrafast optical switching of the THz transmission through metallic subwavelength hole arrays 

    Hendry, Euan; Lockyear, Matthew J.; Gómez Rivas, J.; Kuipers, L.; Bonn, Mischa (American Physical Society, 2007)
    We demonstrate ultrafast optical switching of the transmission of terahertz radiation through a metal grating with subwavelength holes. By fabricating the grating on a semiconductor silicon substrate, we are able to control ...
  • Waveguide arrays as plasmonic metamaterials: transmission below cutoff 

    Hibbins, Alastair P.; Lockyear, Matthew J.; Hooper, Ian R.; Sambles, J. Roy (American Physical Society, 2006)
    Since the work of Ebbesen et al. [Nature (London) 391, 667 (1998)], there has been immense interest in the optical properties of subwavelength holes in metal layers. While the enhanced transmission observed is generally ...