Now showing items 1-20 of 25

  • 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 ...
  • Broadband and low loss high refractive index metamaterials in the microwave regime 

    Campbell, T.; Hibbins, Alastair P.; Sambles, J. Roy; Hooper, Ian R. (American Institute of Physics, 2013)
    A broadband, low-loss, isotropic, high refractive index metamaterial comprising an array of close-packed cubic elements of cross-linked square metal plates is demonstrated in the microwave regime. The structuring of the ...
  • Coupled surface plasmon polaritons on thin metal slabs corrugated on both surfaces 

    Hooper, Ian R.; Sambles, J. Roy (American Physical Society, 2004)
    A modelling study of the effect of coupled surface plasmon polaritons (SPPs) on the optical response of a thin metal film corrugated on both surfaces is presented. Initially the case of conformally corrugated metal films ...
  • Detailed optical study of the transparent wing membranes of the dragonfly Aeshna cyanea 

    Hooper, Ian R.; Vukusic, Peter; Wootton, R. J. (Optical Society of America, 2006)
    The optical properties of transparent single membranes on the wings of the dragonfly Aeshna cyanea have been investigated. These membranes comprise one central thick cuticular layer covered dorsally and ventrally with ...
  • Differential ellipsometric surface plasmon resonance sensors with liquid crystal polarization modulators 

    Hooper, Ian R.; Sambles, J. Roy (American Institute of Physics, 2004)
    Differential ellipsometric interrogation of surface plasmon (SP) resonances is a technique that gives ultrahigh sensitivity to refractive index changes, and it may provide the basis for chemical and biological sensors. In ...
  • Dispersion of surface plasmon polaritons on short-pitch metal gratings 

    Hooper, Ian R.; Sambles, J. Roy (American Physical Society, 2002)
    The dispersion of surface plasmon polaritons (SPPs) has been calculated for short-pitch metal gratings for various depths. For gratings with depths greater than their pitch very flat SPP bands are formed in the zero-order ...
  • Experimental method for reliably establishing the refractive index of buprestid beetle exocuticle 

    Noyes, Joseph Alexander; Vukusic, Peter; Hooper, Ian R. (Optical Society of America, 2007)
    In this study we apply an existing optical characterisation technique to establish reliably the complex refractive indices of layers comprising a natural multilayer reflector in the beetle Chrysochroa raja. Its reflector ...
  • Heavily loaded ferrite-polymer composites to produce high refractive index materials at centimetre wavelengths 

    Parke, L.; Hooper, Ian R.; Hicken, R.J.; Dancer, C.E.J.; Grant, P.S.; Youngs, I.J.; Sambles, J. Roy; Hibbins, Alastair P. (American Institute of Physics (AIP), 2013)
    A cold-pressing technique has been developed for fabricating composites composed of a polytetrafluoroethylene-polymer matrix and a wide range of volume-fractions of MnZn-ferrite filler (0%–80%). The electromagnetic properties ...
  • Light emission through a corrugated metal film: The role of cross-coupled surface plasmon polaritons 

    Wedge, S.; Hooper, Ian R.; Sage, I.; Barnes, William L. (American Physical Society, 2004)
    We examine the phenomenon of light emission through a thin metal film that takes place via surface plasmon polaritons. Surface plasmon polariton cross coupling has recently been invoked to explain sharp features observed ...
  • Making Tunnel Barriers (Including Metals) Transparent 

    Hooper, Ian R.; Preist, T. W.; Sambles, J. Roy (American Physical Society, 2006)
    The classical "brick wall," which may, according to quantum mechanics, leak via tunneling, is here shown to be completely transparent when appropriate impedance matching media are placed both in front of and behind the ...
  • Massively sub-wavelength guiding of electromagnetic waves 

    Hooper, Ian R.; Tremain, B.; Dockrey, J.A.; Hibbins, Alastair P. (Nature Publishing Group, 2014)
    Recently a new form of ultra-thin flexible waveguide consisting of a conducting comb-like structure with a thickness of the order of 1/600(th) of the operating wavelength was presented. However, whilst the thickness of the ...
  • Metamaterial tunnel barrier gives broad band microwave transmission 

    Butler, Celia A.M.; Hooper, Ian R.; Hibbins, Alastair P.; Sambles, J. Roy (American Institute of Physics, 2011)
    A simple structure comprising a metal mesh, symmetrically surrounded by subwavelength thickness dielectric layers, is shown to give near total microwave transmission over a broad frequency range. The mesh may be considered ...
  • 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 ...
  • Optical resonances on sub-wavelength silver lamellar gratings 

    Gadsdon, Martyn Richard; Hooper, Ian R.; Sambles, J. Roy (Optical Society of America, 2008)
    The optical response of sub-wavelength silver lamellar gratings has been theoretically investigated. Two distinct types of resonance have been predicted for incident radiation with E-field perpendicular to the long axis ...
  • Photonic bandgaps for grating-coupled waveguide modes with a silver tunnel barrier 

    Chen, Z.; Hooper, Ian R.; Sambles, J. Roy (Institute of Physics and Deutsche Physikalische Gesellschaft, 2007)
    The optical properties of a periodically modulated photoresist waveguide structure has been explored using the Kretschmann–Raether configuration with a thin silver tunnel barrier. A detailed experimental study of how ...
  • Removing singular refractive indices with sculpted surfaces 

    Quevedo-Teruel, O; Horsley, S.A.R.; Hooper, Ian R.; Mitchell-Thomas, R.C. (Nature Publishing Group, 2014)
    The advent of Transformation Optics established the link between geometry and material properties, and has resulted in a degree of control over electromagnetic fields that was previously impossible. For waves confined to ...
  • Sensing using differential surface plasmon ellipsometry 

    Hooper, Ian R.; Sambles, J. Roy (American Institute of Physics, 2004)
    In this work a differential ellipsometric method utilizing surface plasmons (SPs) for monitoring refractive index changes, which could be used in chemical and biological sensors, is presented. The method is based upon ...
  • Some considerations on the transmissivity of thin metal films 

    Hooper, Ian R.; Sambles, J. Roy (Optical Society of America, 2008)
    As interest in plasmonics grows the optical properties of thin metal films becomes increasingly significant. Here we explore the transmissivity of thin metal films at normal incidence, from the ultraviolet to microwaves, ...
  • Strongly coupled surface plasmons on thin shallow metallic gratings 

    Chen, Z.; Hooper, Ian R.; Sambles, J. Roy (American Physical Society, 2008)
    The optical response of a thin metallic film with shallow corrugations on both surfaces is explored and the structure is found to support a strongly coupled surface plasmon polariton when transverse magnetic radiation is ...
  • Structurally dictated anisotropic "designer surface plasmons" 

    Rance, Helen J.; Hooper, Ian R.; Hibbins, Alastair P.; Sambles, J. Roy (American Institute of Physics, 2011)
    The concept of pseudo-plasmonic surfaces at microwave frequencies is extended to include structures with a high degree of surface anisotropy. The experimental sample is fabricated by patterning a metal with a rectangular ...