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Now showing items 1-20 of 24

  • 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 ...
  • Broad-band polarization conversion from a finite periodic structure in the microwave regime 

    Hallam, B. T.; Lawrence, Christopher R.; Hooper, Ian R.; Sambles, J. Roy (American Institute of Physics, 2004)
    A reflection grating demonstrating extraordinarily broad-band polarization conversion in a nondiffractive regime has been studied at microwave frequencies. This single-element structure has been fabricated by electrolessly ...
  • The coupling of microwave radiation to surface plasmon polaritons and guided modes via dielectric gratings 

    Hibbins, Alastair P.; Sambles, J. Roy; Lawrence, Christopher R. (American Institute of Physics, 2000)
    It is shown that an absorbing dielectric layer, sinusoidally modulated in height, on top of a planar metal substrate, may be used to provide coupling between both s- and p-polarized incident microwave photons and surface ...
  • Coupling of near-grazing microwave photons to surface plasmon polaritons via a dielectric grating 

    Hibbins, Alastair P.; Sambles, J. Roy; Lawrence, Christopher R. (American Physical Society, 2000)
    A dielectric grating on top of a planar metal substrate is shown to couple near-grazing microwave photons to surface plasmon polaritons (SPPs). It is shown that when the grating grooves are oriented such that they are ...
  • 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 ...
  • Excitation of remarkably nondispersive surface plasmons on a nondiffracting, dual-pitch metal grating 

    Hibbins, Alastair P.; Sambles, J. Roy; Lawrence, Christopher R. (American Institute of Physics, 2002)
    A nondiffracting metallic lamellar grating formed from three equally spaced grooves per repeat period, with one being slightly shallower than the other two is examined at microwave frequencies. When filled with a slightly ...
  • 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., ...
  • Grating-coupled surface plasmons at microwave frequencies 

    Hibbins, Alastair P.; Sambles, J. Roy; Lawrence, Christopher R. (American Institute of Physics, 1999)
    This work presents a detailed investigation of electromagnetic coupling to the surface plasmon-polariton (SPP) at microwave frequencies. We have recorded the wavelength-dependent reflectivity from a metallic sinusoidal ...
  • Gratingless enhanced microwave transmission through a subwavelength aperture in a thick metal plate 

    Hibbins, Alastair P.; Sambles, J. Roy; Lawrence, Christopher R. (American Institute of Physics, 2002)
    Remarkably enhanced transmission of microwave radiation through a single subwavelength slit in a thick metallic substrate surrounded by just a pair of parallel deep and narrow grooves is recorded. By also patterning the ...
  • Grazing-incidence iridescence from a butterfly wing 

    Lawrence, Christopher R.; Vukusic, Peter; Sambles, J. Roy (Optical Society of America, 2002)
    The Troides magellanus butterfly exhibits a specialized iridescence that is visible only when its hind wings are both illuminated and viewed at near-grazing incidence. The effect is due to the presence of a constrained ...
  • 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 resonances of ultrathin hexagonally-symmetric microcavity arrays 

    Brown, James R.; Hibbins, Alastair P.; Lawrence, Christopher R.; Lockyear, Matthew J.; Sambles, J. Roy (American Institute of Physics, 2012)
    A metamaterial surface formed by three slot gratings at 60° to each other has two possible high-symmetry arrangements. One forms equilateral triangular metal patches, the other a combination of hexagons and small equilateral ...
  • 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 ...
  • Remarkable transmission of microwaves through a wall of long metallic bricks 

    Hibbins, Alastair P.; Sambles, J. Roy; Lawrence, Christopher R.; Robinson, Donna M. (American Institute of Physics, 2001)
    The transmitted intensity of a microwave beam through a thick continuous metal wall will be effectively zero due to the almost complete exclusion of the electric field from the metal. However, it is shown here that by ...
  • Remarkable Zeroth-Order Resonant Transmission of Microwaves through a Single Subwavelength Metal Slit 

    Suckling, James R.; Sambles, J. Roy; Lawrence, Christopher R. (American Physical Society, 2005)
    A slit in a thick metal plate that is extremely subwavelength will not transmit microwaves polarized parallel to it. It is shown here that cuts perpendicular to the slit allow parallel polarized radiation to resonantly ...
  • Resonant transmission of microwaves through a finite length subwavelength metallic slit 

    Suckling, James R.; Hibbins, Alastair P.; Sambles, J. Roy; Lawrence, Christopher R. (Institute of Physics and Deutsche Physikalische Gesellschaft, 2005)
    The resonant transmission of microwaves polarized perpendicular to a single subwavelength slit of finite length is presented in detail. It is shown that the resonant frequency rises monotonically as slit length is reduced. ...
  • Resonant transmission of microwaves through a hexagonal array of holes in a thin metal layer 

    Suckling, James R.; Sambles, J. Roy; Lawrence, Christopher R. (Institute of Physics and Deutsche Physikalische Gesellschaft, 2007)
    Resonant transmission of microwaves through a hexagonal array of holes in a very thin aluminium layer is studied. The array of holes, with diameter much less than the incident wavelength, leads to a strong transmission ...
  • Sculpted-multilayer optical effects in two species of Papilio butterfly 

    Vukusic, Peter; Sambles, J. Roy; Lawrence, Christopher R.; Wakely, Gavin (Optical Society of America, 2001)
    The wing-scale microstructures associated with two species of Papilio butterfly are described and characterized. Despite close similarities in their structures, they do not exhibit analogous optical effects. With Papilio ...
  • Selective transmission through very deep zero-order metallic gratings at microwave frequencies 

    Went, H. E.; Hibbins, Alastair P.; Sambles, J. Roy; Lawrence, Christopher R.; Crick, A. P. (2000)
    Zero-order metal grating structures are found to give extraordinary selective transmission at microwave frequencies through the resonant excitation of coupled surface waves. The metal slat structures with dielectric spacings ...