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  • Journal article
    Liao Z, Luo Y, Fernández-Domínguez AI, Shen X, Maier SA, Cui TJet al., 2015,

    High-order localized spoof surface plasmon resonances and experimental verifications.

    , Scientific Reports, Vol: 5, ISSN: 2045-2322

    We theoretically demonstrated and experimentally verified high-order radial spoof localized surface plasmon resonances supported by textured metal particles. Through an effective medium theory and exact numerical simulations, we show the emergence of these geometrically-originated electromagnetic modes at microwave frequencies. The occurrence of high-order radial spoof plasmon resonances is experimentally verified in ultrathin disks. Their spectral and near-field properties are characterized experimentally, showing an excellent agreement with theoretical predictions. Our findings shed light into the nature of spoof localized surface plasmons, and open the way to the design of broadband plasmonic devices able to operate at very different frequency regimes.

  • Journal article
    Caldwell JD, Lindsay L, Giannini V, Vurgaftman I, Reinecke TL, Maier SA, Glembocki OJet al., 2015,

    Low-loss, infrared and terahertz nanophotonics using surface phonon polaritons

    , Nanophotonics, Vol: 4, Pages: 44-68, ISSN: 2192-8614

    The excitation of surface-phonon-polariton (SPhP) modes in polar dielectric crystals and the associated new developments in the field of SPhPs are reviewed. The emphasis of this work is on providing an understanding of the general phenomenon, including the origin of the Reststrahlen band, the role that optical phonons in polar dielectric lattices play in supporting sub-diffraction-limited modes and how the relatively long optical phonon lifetimes can lead to the low optical losses observed within these materials. Based on this overview, the achievements attained to date and the potential technological advantages of these materials are discussed for localized modes in nanostructures, propagating modes on surfaces and in waveguides and novel metamaterial designs, with the goal of realizing low-loss nanophotonics and metamaterials in the mid-infrared to terahertz spectral ranges.

  • Journal article
    Duncan AB, Elliott CM, Pavliotis GA, Stuart AMet al., 2015,

    A Multiscale Analysis of Diffusions on Rapidly Varying Surfaces

    , JOURNAL OF NONLINEAR SCIENCE, Vol: 25, Pages: 389-449, ISSN: 0938-8974
  • Journal article
    Schmuck M, Pradas M, Pavliotis GA, Kalliadasis Set al., 2015,

    A new mode reduction strategy for the generalized Kuramoto-Sivashinsky equation

    , IMA JOURNAL OF APPLIED MATHEMATICS, Vol: 80, Pages: 273-301, ISSN: 0272-4960
  • Journal article
    Braic L, Vasilantonakis N, Zou B, Maier SA, Alford NM, Zayats AV, Petrov PKet al., 2015,

    Optimizing strontium ruthenate thin films for near-infrared plasmonic applications

    , Scientific Reports, Vol: 5, ISSN: 2045-2322

    Several new plasmonic materials have recently been introduced in order to achieve better temperature stability than conventional plasmonic metals and control field localization with a choice of plasma frequencies in a wide spectral range. Here, epitaxial SrRuO3 thin films with low surface roughness fabricated by pulsed laser deposition are studied. The influence of the oxygen deposition pressure (20–300 mTorr) on the charge carrier dynamics and optical constants of the thin films in the near-infrared spectral range is elucidated. It is demonstrated that SrRuO3 thin films exhibit plasmonic behavior of the thin films in the near-infrared spectral range with the plasma frequency in 3.16–3.86 eV range and epsilon-near-zero wavelength in 1.11–1.47 μm range that could be controlled by the deposition conditions. The possible applications of these films range from the heat-generating nanostructures in the near-infrared spectral range, to metamaterial-based ideal absorbers and epsilon-near-zero components, where the interplay between real and imaginary parts of the permittivity in a given spectral range is needed for optimizing the spectral performance.

  • Journal article
    Chen Y, Li X, Sonnefraud Y, Fernandez-Dominguez AI, Luo X, Hong M, Maier SAet al., 2015,

    Engineering the Phase Front of Light with Phase-Change Material Based Planar lenses

    , SCIENTIFIC REPORTS, Vol: 5, ISSN: 2045-2322
  • Journal article
    Rakovich A, Albella P, Maier SA, 2015,

    Plasmonic Control of Radiative Properties of Semiconductor Quantum Dots Coupled to Plasmonic Ring Cavities

    , ACS NANO, Vol: 9, Pages: 2648-2658, ISSN: 1936-0851
  • Journal article
    Francescato Y, Yang J, Huang M, Maier SAet al., 2015,

    General considerations for the miniaturization of radiative antennae

    , OPTICS EXPRESS, Vol: 23, Pages: 3209-3220, ISSN: 1094-4087
  • Journal article
    Perevedentsev A, Sonnefraud Y, Belton CR, Sharma S, Cass AEG, Maier SA, Kim J-S, Stavrinou PN, Bradley DDCet al., 2015,

    Dip-pen patterning of poly(9,9-dioctylfluorene) chain-conformation-based nano-photonic elements

    , Nature Communications, ISSN: 2041-1723

    Metamaterials are a promising new class of materials, in which sub-wavelength physical structures, rather than variations in chemical composition, can be used to modify the nature of their interaction with electromagnetic radiation. Here we show that a metamaterials approach, using a discrete physical geometry (conformation) of the segments of a polymer chain as the vector for a substantial refractive index change, can be used to enable visible wavelength, conjugated polymer photonic elements. In particular, we demonstrate that a novel form of dip-pen nanolithography provides an effective means to pattern the so-called β-phase conformation in poly(9,9-dioctylfluorene) thin films. This can be done on length scales ≤500 nm, as required to fabricate a variety of such elements, two of which are theoretically modelled using complex photonic dispersion calculations.

  • Journal article
    Joseph LM, Craster RV, 2015,

    Reflection from a semi-infinite stack of layers using homogenization

    , Wave Motion, Vol: 54, Pages: 145-156, ISSN: 0165-2125

    A canonical scattering problem is that of a plane wave incident upon a periodic layered medium. Our aim here is to replace the periodic medium by a homogenized counterpart and then to investigate whether this captures the reflection and transmission behaviour accurately at potentially high frequencies.We develop a model based upon high frequency homogenization and compare the reflection coefficients and full fields with the exact solution. For some material properties it is shown that the asymptotic behaviour of the dispersion curves are locally linear near critical frequencies and that low frequency behaviour is replicated at these critical, high, frequencies. The homogenization approach accurately replaces the periodic medium and the precise manner in which this is achieved then opens the way to future numerical implementation of this technique to scattering problems.

  • Journal article
    Colquitt DJ, Craster RV, Antonakakis T, Guenneau Set al., 2015,

    Rayleigh-Bloch waves along elastic diffraction gratings

  • Conference paper
    Lafone L, Ngoc N, Clarke E, Fry P, Oulton RFet al., 2015,

    III-V GaAs based plasm onic lasers

    , Conference on Active Photonic Materials VII, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, ISSN: 0277-786X
  • Conference paper
    Craster RV, 2015,

    Dynamic Homogenization

    , 9th International Congress of the International-Society-for-Analysis-its-Applications-and-Computations (ISAAC), Publisher: SPRINGER, Pages: 41-50, ISSN: 2194-1009
  • Conference paper
    Gennaro SD, Sonnefraud Y, Verellen N, van Dorpe P, Moshchalkov VV, Maier SA, Oulton RFet al., 2015,

    Spectral interferometric microscopy reveals absorption by individual optical nano-antennas from extinction phase

    , 9th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS), Publisher: IEEE, Pages: 403-405
  • Conference paper
    Sidiropoulos TPH, Roder R, Geburt S, Hess O, Maier SA, Ronning C, Oulton RFet al., 2015,

    Ultrafast plasmonic nanowire lasers near the surface plasmon frequency

    , Conference on Active Photonic Materials VII, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, ISSN: 0277-786X
  • Journal article
    Joubaud R, Pavliotis GA, Stoltz G, 2015,

    Langevin Dynamics with Space-Time Periodic Nonequilibrium Forcing

    , JOURNAL OF STATISTICAL PHYSICS, Vol: 158, Pages: 1-36, ISSN: 0022-4715
  • Conference paper
    Gennaro SD, Roschuk TR, Maier SA, Oulton RFet al., 2015,

    Measuring chromatic aberration in imaging systems using plasmonic nano-particles

    , 9th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS), Publisher: IEEE, Pages: 406-408
  • Journal article
    Kossoy A, Merk V, Simakov D, Leosson K, Kena-Cohen S, Maier SAet al., 2015,

    Optical and Structural Properties of Ultra-thin Gold Films

    , Advanced Optical Materials, Vol: 3, Pages: 71-77, ISSN: 2195-1071
  • Journal article
    Maier SA, Aouani H, Rahmani M, Navarro Met al., 2015,

    Unveiling the origin of third harmonic generation in hybrid ITO-plasmonic crystals

    , Advanced Optical Materials, ISSN: 2195-1071
  • Journal article
    Caldarola M, Albella P, Cortés E, Rahmani M, Roschuk T, Grinblat G, Oulton RF, Bragas AV, Maier SAet al., 2015,

    Non-plasmonic nanoantennas for surface enhanced spectroscopies with ultra-low heat conversion.

    , Nature Communications, Vol: 6, Pages: 7915-7915, ISSN: 2041-1723

    Nanoplasmonics has recently revolutionized our ability to control light on the nanoscale. Using metallic nanostructures with tailored shapes, it is possible to efficiently focus light into nanoscale field 'hot spots'. High field enhancement factors have been achieved in such optical nanoantennas, enabling transformative science in the areas of single molecule interactions, highly enhanced nonlinearities and nanoscale waveguiding. Unfortunately, these large enhancements come at the price of high optical losses due to absorption in the metal, severely limiting real-world applications. Via the realization of a novel nanophotonic platform based on dielectric nanostructures to form efficient nanoantennas with ultra-low light-into-heat conversion, here we demonstrate an approach that overcomes these limitations. We show that dimer-like silicon-based single nanoantennas produce both high surface enhanced fluorescence and surface enhanced Raman scattering, while at the same time generating a negligible temperature increase in their hot spots and surrounding environments.

  • Journal article
    Park H-R, Namgung S, Chen X, Lindquist NC, Giannini V, Francescato Y, Maier SA, Oh S-Het al., 2015,

    Perfect Extinction of Terahertz Waves in Monolayer Graphene over 2-nm-Wide Metallic Apertures

    , Advanced Optical Materials, ISSN: 2195-1071

    High carrier mobility and tunability in graphene enable fundamental studies for plasmonics and various applications. Despite its versatility, however, single-layer graphene (SLG) suffers from poor coupling efficiency to electromagnetic waves, presenting a major challenge for photonic applications. Compared with visible or infrared radiation, terahertz (THz) waves exhibit higher absorption in SLG due to Drude-like intraband transitions, but the wavelength-to-SLG size mismatch becomes even more dramatic. Here, we experimentally demonstrate 99% extinction of THz wave transmission when SLG covers the openings of 2-nm-wide (≈λ/1 000 000) slits through a metal film. By resonantly coupling THz waves through annular nanogaps, the extremely localized fields lead to near-perfect extinction and strong absorption in SLG. Atomic-layer lithography is used to produce these nanometer-wide, millimeter-long gaps over an entire 4-in. wafer. Furthermore, by integrating these devices with an ionic liquid, enhanced intraband absorption in the SLG leads to 80% modulation of THz waves with an operational voltage as low as 1.5 V.

  • Journal article
    Crick CR, Albella P, Ng B, Roschuk T, Ivanov AP, Cecchini MP, Bresme F, Maier SA, Edel JBet al., 2014,

    Precise Attolitre Temperature Control of Nanopore Sensors using a Nanoplasmonic Bullseye

    , Nano Letters, Vol: 15, Pages: 553-559, ISSN: 1530-6992

    Targeted temperature control in nanopores isgreatly important in further understanding biological molecules.Such control would extend the range of examinablemolecules and facilitate advanced analysis, including thecharacterization of temperature-dependent molecule conformations.The work presented within details well-definedplasmonic gold bullseye and silicon nitride nanoporemembranes. The bullseye nanoantennae are designed andoptimized using simulations and theoretical calculations forinteraction with 632.8 nm laser light. Laser heating wasmonitored experimentally through nanopore conductancemeasurements. The precise heating of nanopores is demonstratedwhile minimizing the accumulation of heat in the surrounding membrane material

  • Journal article
    Grinblat G, Rahmani M, Cortes E, Caldarola M, Comedi D, Maier SA, Bragas AVet al., 2014,

    High-Efficiency Second Harmonic Generation from a Single Hybrid ZnO Nanowire/Au Plasmonic Nano-Oligomer

    , NANO LETTERS, Vol: 14, Pages: 6660-6665, ISSN: 1530-6984
  • Journal article
    Sidiropoulos TPH, Roeder R, Geburt S, Hess O, Maier SA, Ronning C, Oulton RFet al., 2014,

    Ultrafast plasmonic nanowire lasers near the surface plasmon frequency

    , NATURE PHYSICS, Vol: 10, Pages: 870-876, ISSN: 1745-2473
  • Journal article
    Caldwell JD, Kretinin AV, Chen Y, Giannini V, Fogler MM, Francescato Y, Ellis CT, Tischler JG, Woods CR, Giles AJ, Hong M, Watanabe K, Taniguchi T, Maier SA, Novoselov KSet al., 2014,

    Sub-diffractional volume-confined polaritons in the natural hyperbolic material hexagonal boron nitride

    , Nature Communications, Vol: 5, ISSN: 2041-1723

    Strongly anisotropic media, where the principal components of the dielectric tensor have opposite signs, are called hyperbolic. Such materials exhibit unique nanophotonic properties enabled by the highly directional propagation of slow-light modes localized at deeply sub-diffractional length scales. While artificial hyperbolic metamaterials have been demonstrated, they suffer from high plasmonic losses and require complex nanofabrication, which in turn induces size-dependent limitations on optical confinement. The low-loss, mid-infrared, natural hyperbolic material hexagonal ​boron nitride is an attractive alternative. Here we report on three-dimensionally confined ‘hyperbolic polaritons’ in ​boron nitride nanocones that support four series (up to the seventh order) modes in two spectral bands. The resonant modes obey the predicted aspect ratio dependence and exhibit high-quality factors (Q up to 283) in the strong confinement regime (up to λ/86). These observations assert hexagonal ​boron nitride as a promising platform for studying novel regimes of light–matter interactions and nanophotonic device engineering.

  • Journal article
    Sidiropoulos TPH, Nielsen MP, Roschuk TR, Zayats AV, Maier SA, Oulton RFet al., 2014,

    Compact Optical Antenna Coupler for Silicon Photonics Characterized by Third-Harmonic Generation

    , ACS PHOTONICS, Vol: 1, Pages: 912-916, ISSN: 2330-4022
  • Journal article
    Schmuck M, Pavliotis GA, Kalliadasis S, 2014,

    Effective macroscopic interfacial transport equations in strongly heterogeneous environments for general homogeneous free energies

    , APPLIED MATHEMATICS LETTERS, Vol: 35, Pages: 12-17, ISSN: 0893-9659
  • Journal article
    Pickering TW, Hamm JM, Page AF, Wuestner S, Hess Oet al., 2014,

    Cavity-free plasmonic nanolasing enabled by dispersionless stopped light

    , Nature Communications, Vol: 5, Pages: 4972-4972, ISSN: 2041-1723
  • Journal article
    Sonnefraud Y, Sinclair HG, Sivan Y, Foreman MR, Dunsby CW, Neil MAA, French PM, Maier SAet al., 2014,

    Experimental Proof of Concept of Nanoparticle-Assisted STED

    , NANO LETTERS, Vol: 14, Pages: 4449-4453, ISSN: 1530-6984
  • Journal article
    Lafone L, Sidiropoulos TPH, Oulton RF, 2014,

    Silicon-based metal-loaded plasmonic waveguides for low-loss nanofocusing

    , OPTICS LETTERS, Vol: 39, Pages: 4356-4359, ISSN: 0146-9592

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