Publications
795 results found
Tanoto H, Teng JH, Wu QY, et al., 2012, Greatly enhanced continuous-wave terahertz emission by nano-electrodes in a photoconductive photomixer, NATURE PHOTONICS, Vol: 6, Pages: 121-126, ISSN: 1749-4885
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- Citations: 55
Ganeev RA, Witting T, Hutchison C, et al., 2012, Enhanced high-order-harmonic generation in a carbon ablation plume, PHYSICAL REVIEW A, Vol: 85, ISSN: 1050-2947
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- Citations: 56
Grogan MDW, Heck SC, Xiao LM, et al., 2012, Control of nanoparticle aggregation in aerogel hosts, JOURNAL OF NON-CRYSTALLINE SOLIDS, Vol: 358, Pages: 241-245, ISSN: 0022-3093
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- Citations: 8
Luo Y, Lei DY, Maier SA, et al., 2012, Broadband Light Harvesting Nanostructures Robust to Edge Bluntness, PHYSICAL REVIEW LETTERS, Vol: 108, ISSN: 0031-9007
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- Citations: 81
Arrell CA, Skopalova E, Lei DY, et al., 2012, A system for conducting surface science with attosecond pulses, Pages: 359-363, ISSN: 0930-8989
We report the development of an apparatus to allow time resolved photoelectron spectroscopy of charge motion on solids and structured surfaces with attosecond resolution in an ultra high vacuum environment. The system, connected to the Attosecond Beamline at Imperial College, allows probing of charge dynamics on surfaces and plasmonic fields on structured surfaces with a few-cycle NIR pulse and attosecond pulse trains. The system incorporates novel methods of vibration isolation to eliminate vibrations coupling to sample and optics from mechanical vibrations. An isolated attosecond pulse can also be used with the addition of a multilayer XUV optic. A two-photon photoemission measure of a hot electron population in gold is presented. © Springer-Verlag Berlin Heidelberg 2012.
Tanoto H, Teng JH, Wu QY, et al., 2012, Greatly enhanced continuous-wave terahertz emission by nano-electrodes in a photoconductive photomixer, Nature Photonics, Vol: 6, Pages: 121-126, ISSN: 1749-4885
An efficient, room-temperature-operation continuous-wave terahertz source will greatly benefit compact terahertz system development for high-resolution terahertz spectroscopy and imaging applications. Here, we report highly efficient continuous-wave terahertz emission using nanogap electrodes in a photoconductive antenna-based photomixer. The tip-to-tip nanogap electrode structure provides strong terahertz field enhancement and acts as a nano-antenna to radiate the terahertz wave generated in the active region of the photomixer. In addition, it provides good impedance-matching to the terahertz planar antenna and exhibits a lower RC time constant, allowing more efficient radiation, especially at the higher part of the terahertz spectrum. As a result, the output power of the photomixer with the new nanogap electrode structure in the active region is two orders of magnitude higher than for a photomixer with typical interdigitated electrodes. The terahertz emission bandwidth also increases by a factor of more than two. © 2012 Macmillan Publishers Limited. All rights reserved.
Rehammar R, Francescato Y, Fernandez-Dominguez AI, et al., 2012, Diffraction from carbon nanofiber arrays, OPTICS LETTERS, Vol: 37, Pages: 100-102, ISSN: 0146-9592
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- Citations: 4
Miroshnichenko AE, Luk'yanchuk B, Maier SA, et al., 2012, Optically Induced Interaction of Magnetic Moments in Hybrid Metamaterials, ACS NANO, Vol: 6, Pages: 837-842, ISSN: 1936-0851
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- Citations: 87
Hanham SM, Gregory A, Maier SA, et al., 2012, A Dielectric Probe for Near-field Millimeter-wave Imaging, 37th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), Publisher: IEEE, ISSN: 2162-2027
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- Citations: 1
Kessler W, Diedrich S, Menges P, et al., 2012, The Role of the Vagus Nerve: Modulation of the Inflammatory Reaction in Murine Polymicrobial Sepsis, MEDIATORS OF INFLAMMATION, Vol: 2012, ISSN: 0962-9351
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- Citations: 26
Li X, 2012, Aluminum Nanoparticles for Efficient Light-trapping in Plasmonic Gallium Arsenide Solar Cells, 2012 ASIA COMMUNICATIONS AND PHOTONICS CONFERENCE (ACP), ISSN: 2162-108X
Shah CM, Withayachumnankul W, Hanham SM, et al., 2012, Design and Analysis of a Metasurface for Supporting Spoof Surface Plasmon Polaritons, Conference on Optoelectronic and Microelectronic Materials and Devices (COMMAD), Publisher: IEEE, Pages: 159-+, ISSN: 1097-2137
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- Citations: 1
Appavoo K, Lei DY, Sonnefraud Y, et al., 2012, Role of Defects in the Phase Transition of VO2 Nanoparticles Probed by Plasmon Resonance Spectroscopy, Nano Letters, Vol: 12, Pages: 780-786-780-786
Sonnefraud Y, Maier SA, 2012, Surface Plasmon Polaritons: Excitation and Effect of Loss in the Quantum Regime, 14th International Conference on Transparent Optical Networks (ICTON), Publisher: IEEE, ISSN: 2162-7339
Lei DY, Fern ndez-Dom nguez AI, Sonnefraud Y, et al., 2012, Revealing Plasmonic Gap Modes in Particle-on-Film Systems Using Dark-Field Spectroscopy, ACS Nano, Vol: 6, Pages: 1380-1386-1380-1386
Pendry JB, Maier SA, 2011, Comment on "Spaser Action, Loss Compensation, and Stability in Plasmonic Systems with Gain", PHYSICAL REVIEW LETTERS, Vol: 107, ISSN: 0031-9007
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- Citations: 15
Hylton NP, Giannini V, Vercruysse D, et al., 2011, III-V plasmonic solar cells: Targeting absorption enhancements close to the GaAs band edge
Hylton NP, Giannini V, Vercruysse D, et al., 2011, Plasmonic nanostructures for absorption enhancements close to the GaAs band edge, Conference Record of the IEEE Photovoltaic Specialists Conference, Pages: 003627-003630, ISSN: 0160-8371
In this paper we present the optical characterisation of periodic arrays of Au nanoparticles fabricated on both GaAs substrates and a triple junction solar cell structure. The nanoparticle arrays were designed to employ the localised surface plasmon resonances of the nanoparticles and diffraction effects arising from the periodicity of the arrays, at wavelengths close to the GaAs band edge. In principle effects such as these may be used to improve the absorption of light in solar cell structures and hence increase their efficiency. In particular, we aim to build upon the success of high efficiency GaAs based photovoltaic cells by targeting the spectral region close to the band edge, where the absorption strength in conventional GaAs solar cells is poor. We demonstrate from numerical simulations and experimental observation that by careful adjustment of the nanoparticle dimensions we can tune the localised surface plasmon resonance to the desired wavelength. Furthermore, we show evidence of the diffraction of incident light into lateral modes within the absorbing material, increasing the optical path length. This effect is associated with the periodic nature of the arrays, and can therefore also be spectrally tuned by controlling the spacing between the nanoparticles. Such periodic nanoparticle arrays therefore provide two methods of absorption enhancement that may be employed in the same structure. © 2011 IEEE.
Maier SA, 2011, Plasmonic photovoltaics: Linking nanophotonics with carrier transport considerations
Giannini V, Hylton NP, Li X, et al., 2011, Solar cells with a multi-functional plasmonic light concentration layer, Conference Record of the IEEE Photovoltaic Specialists Conference, Pages: 000864-000865, ISSN: 0160-8371
Conversion of solar energy into electricity is considered one of the most promising solutions to the energy problem. Conventional III-V solar cells are designed such that their optical depth for absorption relates directly to the thickness of the absorbing material. This results in relatively thick solar cell structures consuming valuable semiconductor material and increasing the solar cell manufacturing time[1]. The ability to manipulate light using plasmonics could be extremely advantageous, enabling the optical depth for absorption becomes much greater than the thickness of the absorber, resulting in enhanced light absorption in thin-film solar cells[1, 2]. © 2011 IEEE.
McCarron R, Dickson W, Bouillard JS, et al., 2011, Electrically-driven surface plasmon polariton generation using conjugated polymers
Miroshnichenko AE, Luk'yanchuk BS, Maier SA, et al., 2011, Antiferromagnetic response of dielectric nanoparticles coupled to split-ring resonators, Pages: 1028-1030
We analyze optically-induced antiferromagnetic response of a novel hybrid metal/dielectric structure consisting of a silicon nanoparticle coupled to multilayer stacks of splitring resonators, and observe a strong antiferromagnetic resonance with a staggered pattern of the induced magnetization field. A periodic array of such elements will support a novel type of spin waves. © 2011 AOS.
Maier SA, 2011, Coherent and broadband plasmonic nanocavities
Plasmonic nanocavities are physical realizations of nanoscale classical oscillator systems. Via a variety of example drawn from the optical and infrared part of the spectrum, we will discuss systems exhibiting Fano resonances or broadband light harvesting behaviour. A particular focus will lie on transformation optics as a design tool, and the coupling to nanoscale light emitters. © 2011 OSA.
Miroshnichenko AE, Luk'yanchuk BS, Maier SA, et al., 2011, Antiferromagnetic response of dielectric nanoparticles coupled to split-ring resonators, Pages: 1028-1030
We analyze optically-induced antiferromagnetic response of a novel hybrid metal/dielectric structure consisting of a silicon nanoparticle coupled to multilayer stacks of split-ring resonators, and observe a strong antiferromagnetic resonance with a staggered pattern of the induced magnetization field. A periodic array of such elements will support a novel type of spin waves. © 2011 IEEE.
Fernández-Domínguez AI, Maier SA, 2011, Nanoplasmonics: New design concepts for nanoscale optical cavities
The design of nanoplasmonic cavities exploiting coherent processes such as sub- and superradiance as well as Fano-type interactions will be discussed, under the framework of plasmon hybridization theory. In such cavities, interactions between bright and dark localized plasmon modes lead to a complex mode spectrum, which can be visualized using electron energy loss spectroscopy. First implementations fabricated using electron beam lithography will be presented. Furthermore, it will be shown how the concept of transformation optics can be utilized for the design of nanoresonators with a broadband absorption spectrum, showing high promise for light harvesting over the whole visible and infrared range of the spectrum. © 2011 IEEE.
Kena-Cohen S, Wiener A, Sivan Y, et al., 2011, Plasmonic sinks for the selective removal of long-lived states, ACS Nano
Yoon H, Maier SA, Bradley DDC, et al., 2011, Surface plasmon coupled emission using conjugated light-emitting polymer films [Invited], OPTICAL MATERIALS EXPRESS, Vol: 1, Pages: 1127-1138, ISSN: 2159-3930
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- Citations: 9
McCarron R, Dickson W, Bouillard JS, et al., 2011, Electrically-driven surface plasmon polariton generation using conjugated polymers
Current computational interconnects rely on electrical signal transfer in metal wires. The need for smaller wires integrated into a narrow area leads to potential signal loss through crosstalk and fabrication difficulties. Potential solutions include optical signal transfer, which is large scale, and plasmonic mediated signals, providing a subwavelength-scale solution. © 2011 IEEE.
Hylton NP, Giannini V, Vercruysse D, et al., 2011, III-V plasmonic solar cells: Targeting absorption enhancements close to the GaAs band edge, 2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011
Research into photovoltaics has attracted a great deal of attention in recent years since it represents a realistic solution to the so-called energy crisis. To date however, solar cells have suffered from relatively high cost efficiency ($/Wp) [1,2], limiting their commercial uptake. Recent research has therefore focused on the need to improve solar cell efficiencies to make photovoltaics a viable alternative to fossil fuels. One area of investigation is in the application of plasmonic nanoparticles in order to enhance the absorption of light in solar cells [1-3]. Such an enhancement of the photoabsorption may allow the fabrication of structures in which the optical absorption depth is significantly larger than the thickness of the absorbing material, reducing the amount of material required and hence the cost of production [1,3]. © 2011 IEEE.
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