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  • Journal article
    Lei DY, Appavoo K, Ligmajer F, Sonnefraud Y, Haglund RF, Maier SAet al., 2015,

    Optically-Triggered Nanoscale Memory Effect in a Hybrid Plasmonic-Phase Changing Nanostructure

    , ACS PHOTONICS, Vol: 2, Pages: 1306-1313, ISSN: 2330-4022
  • Journal article
    Moia D, Cappel UB, Leijtens T, Li X, Telford AM, Snaith HJ, O'Regan BC, Nelson J, Barnes PRFet al., 2015,

    The Role of Hole Transport between Dyes in Solid-State Dye-Sensitized Solar Cells

    , Journal of Physical Chemistry C, Vol: 119, Pages: 18975-18985, ISSN: 1932-7447
  • Journal article
    Moseley D, Yates KA, Branford WR, Sefat AS, Mandrus D, Stuard SJ, Salem-Sugui S, Ghivelder L, Cohen LFet al., 2015,

    Signatures of filamentary superconductivity in antiferromagnetic BaFe2As2 single crystals

    , EPL, Vol: 111, ISSN: 0295-5075
  • Journal article
    Bryant D, Wheeler S, ORegan BC, Watson T, Barnes PRF, Worsley D, Durrant Jet al., 2015,

    Observable Hysteresis at Low Temperature in “Hysteresis Free” Organic–Inorganic Lead Halide Perovskite Solar Cells

    , The Journal of Physical Chemistry Letters, Vol: 6, Pages: 3190-3194, ISSN: 1948-7185
  • Journal article
    Liu W, Oulton RF, Kivshar YS, 2015,

    Geometric interpretations for resonances of plasmonic nanoparticles

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

    The field of plasmonics can be roughly categorized into two branches: surface plasmon polaritons (SPPs) propagating in waveguides and localized surface plasmons (LSPs) supported by scattering particles. Investigations along these two directions usually employ different approaches, resulting in more or less a dogma that the two branches progress almost independently of each other, with few interactions. Here in this work we interpret LSPs from a Bohr model based geometric perspective relying on SPPs, thus establishing a connection between these two sub-fields. Besides the clear explanations of conventional scattering features of plasmonic nanoparticles, based on this geometric model we further demonstrate other anomalous scattering features (higher order modes supported at lower frequencies, and blueshift of the resonance with increasing particle sizes) and multiple electric resonances of the same order supported at different frequencies, which have been revealed to originate from backward SPP modes and multiple dispersion bands supported in the corresponding plasmonic waveguides, respectively. Inspired by this geometric model, it is also shown that, through solely geometric tuning, the absorption of each LSP resonance can be maximized to reach the single channel absorption limit, provided that the scattering and absorption rates are tuned to be equal.

  • Journal article
    Daskalakis KS, Maier SA, Kena-Cohen S, 2015,

    Spatial Coherence and Stability in a Disordered Organic Polariton Condensate

    , PHYSICAL REVIEW LETTERS, Vol: 115, ISSN: 0031-9007
  • Journal article
    Tufarelli T, McEnery KR, Maier SA, Kim MSet al., 2015,

    Signatures of the A2 term in ultrastrongly coupled oscillators

    , Physical Review A, Vol: 91, ISSN: 1094-1622

    We study a bosonic matter excitation coupled to a single-mode cavity field via electric dipole. Counter-rotating and A2 terms are included in the interaction model, A being the vector potential of the cavity field. In the ultrastrong coupling regime the vacuum of the bare modes is no longer the ground state of the Hamiltonian and contains a nonzero population of polaritons, the true normal modes of the system. If the parameters of the model satisfy the Thomas-Reiche-Kuhn sum rule, we find that the two polaritons are always equally populated. We show how this prediction could be tested in a quenching experiment, by rapidly switching on the coupling and analyzing the radiation emitted by the cavity. A refinement of the model based on a microscopic minimal coupling Hamiltonian is also provided, and its consequences on our results are characterized analytically.

  • Journal article
    Thomas T, Mellor A, Hylton NP, Fuehrer M, Alonso-Alvarez D, Braun A, Ekins-Daukes NJ, David JPR, Sweeney SJet al., 2015,

    Requirements for a GaAsBi 1 eV sub-cell in a GaAs-based multi-junction solar cell

    , Semiconductor Science and Technology, Vol: 30, ISSN: 1361-6641
  • Journal article
    Roeder R, Sidiropoulos TPH, Tessarek C, Christiansen S, Oulton RF, Ronning Cet al., 2015,

    Ultrafast Dynamics of Lasing Semiconductor Nanowires

    , Nano Letters, Vol: 15, Pages: 4637-4643, ISSN: 1530-6992

    Semiconductor nanowire lasers operate at ultrafast timescales; here we report their temporal dynamics, including laser onset time and pulse width, using a double-pump approach. Wide bandgap gallium nitride (GaN), zinc oxide (ZnO), and cadmium sulfide (CdS) nanowires reveal laser onset times of a few picoseconds, driven by carrier thermalization within the optically excited semiconductor. Strong carrier–phonon coupling in ZnO leads to the fastest laser onset time of ∼1 ps in comparison to CdS and GaN exhibiting values of ∼2.5 and ∼3.5 ps, respectively. These values are constant between nanowires of different sizes implying independence from any optical influences. However, we demonstrate that the lasing onset times vary with excitation wavelength relative to the semiconductor band gap. Meanwhile, the laser pulse widths are dependent on the optical system. While the fastest ultrashort pulses are attained using the thinnest possible nanowires, a sudden change in pulse width from ∼5 to ∼15 ps occurs at a critical nanowire diameter. We attribute this to the transition from single to multimode waveguiding, as it is accompanied by a change in laser polarization.

  • Journal article
    Chen Y, Li X, Luo X, Maier SA, Hong Met al., 2015,

    Tunable near-infrared plasmonic perfect absorber based on phase-change materials

    , PHOTONICS RESEARCH, Vol: 3, Pages: 54-57

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