Guiding of electromagnetic energy in subwavelength periodic metal structures
7 Angebote vergleichen

Lieferung aus: Deutschland, E-Book zum Download.
Inhaltsangabe:Abstract: The ultimate miniaturization of optical devices requires structures that guide electromagnetic energy with a lateral confinement below the diffraction limit of light. In this thesis, the possibility of employing plasmon-polariton excitations in plasmon waveguides consisting of closely spaced metal nanoclusters for this purpose is examined. The feasibility of energy transport with mode sizes below the diffraction limit of visible light over distances of several hundred nanometers is demonstrated. As a macroscopic analogue to plasmon waveguides, the transport of electromagnetic energy in the microwave regime along closely spaced centimeter-scale metal rods is examined. Full-field electrodynamic simulations show that information transport occurs at a group velocity of 0.65c for fabricated structures consisting of copper rods excited at 8 GHz. A variety of passive routing structures and an all-optical modulator are demonstrated. The possibility of guiding electromagnetic energy at visible frequencies with mode sizes below the diffraction limit using plasmon waveguides is analyzed using a point-dipole model and finite-difference time-domain simulations. It is shown that energy transport occurs via near-field coupling between metal nanoparticles, which leads to coherent propagation of energy. For spherical gold particles in air, group velocities up to 0.06c are demonstrated, and a change in particle shape to spheroidal particles shows up to a threefold increase in group velocity. Pulses with transverse polarization are shown to propagate with negative phase velocities antiparallel to the energy flow. Plasmon waveguides consisting of gold and silver nanoparticles were fabricated using electron beam lithography. The key parameters that govern the energy transport are determined for various interparticle spacings and particle chain lengths using far-field measurements of the collective plasmon modes. Spherical gold nanoparticles with a diameter of 50 nm and an interparticle spacing of 75 nm show an energy attenuation of 6 dB/30 nm. This loss can be reduced by one order of magnitude by a geometry change to spheroidal particles. Using the tip of a near-field optical microscope as a local excitation source and fluorescent nanospheres as detectors, experimental evidence for energy transport over a distance of 0.5 µm is presented for plasmon waveguides consisting of silver rods with a 3:1 aspect ratio. Inhaltsverzeichnis:Table of Contents: Chapter 1Introduction1 1.1Towards nanoscale optical devices1 1.2Surface plasmons as a way to overcome the diffraction limit2 1.3Road map through this thesis5 Chapter 2Yagi waveguides8 2.1Introduction8 2.2The dispersion of a Yagi waveguide9 2.3Guiding along linear and corner Yagi arrays: Experiments and simulations14 2.4Towards active devices: A three-terminal modulator19 2.5The link to nanoscale plasmon waveguides22 2.6Conclusions and outlook23 Chapter 3Going nanoscale: Point-dipole theory of plasmon waveguides25 3.1Plasmon resonances in small metal clusters25 3.2Near-field particle interactions in plasmon waveguides32 3.3Routing and switching of electromagnetic energy in plasmon waveguides37 3.4Conclusions and limitations of the dipole model39 Chapter 4FDTD simulations of plasmon waveguides41 4.1Introduction41 4.2Collective far-field excitation of plasmon waveguides41 4.3Locally excited plasmon waveguides49 4.4Tailoring of the guiding properties by particle design55 4.5Conclusions and outlook57 Chapter 5Fabrication and far-field properties of plasmon waveguides62 5.1Introduction62 5.2Fabrication of plasmon waveguides63 5.3Far-field characterization of interparticle coupling in plasmon waveguides67 5.4Conclusion and outlook: Decrease of waveguide loss by particle design75 Chapter 6Local excitation of plasmon waveguides79 6.1Introduction79 6.2Transmission NSOM analysis of plasmon waveguides: Facts and artifacts83 6.3Molecular fluorescence as a probe for localized electromagnetic fields89 6.4Local excitation and detection of energy transport in plasmon waveguides96 6.5Conclusions and outlook103 Chapter 7Conclusions and outlook109 Bibliography116.

Lieferung aus: Deutschland, zzgl. Versandkosten, Sofort per Download lieferbar.
Doktorarbeit / Dissertation aus dem Jahr 2003 im Fachbereich Physik - Sonstiges, California Institute of Technology (Caltech) (unbekannt), Sprache: Englisch, Inhaltsangabe:Abstract:The ultimate miniaturization of optical devices requires structures that guide electromagnetic energy with a lateral confinement below the diffraction limit of light. In this thesis, the possibility of employing plasmon-polariton excitations in „plasmon waveguides“ consisting of closely spaced metal nanoclusters for this purpose is examined. The feasibility of energy transport with mode sizes below the diffraction limit of visible light over distances of several hundred nanometers is demonstrated.As a macroscopic analogue to plasmon waveguides, the transport of electromagnetic energy in the microwave regime along closely spaced centimeter-scale metal rods is examined. Full-field electrodynamic simulations show that information transport occurs at a group velocity of 0.65c for fabricated structures consisting of copper rods excited at 8 GHz. A variety of passive routing structures and an all-optical modulator are demonstrated.The possibility of guiding electromagnetic energy at visible frequencies with mode sizes below the diffraction limit using plasmon waveguides is analyzed using a point-dipole model and finite-difference time-domain simulations. It is shown that energy transport occurs via near-field coupling between metal nanoparticles, which leads to coherent propagation of energy. For spherical gold particles in air, group velocities up to 0.06c are demonstrated, and a change in particle shape to spheroidal particles shows up to a threefold increase in group velocity. Pulses with transverse polarization are shown to propagate with negative phase velocities antiparallel to the energy flow.Plasmon waveguides consisting of gold and silver nanoparticles were fabricated using electron beam lithography. The key parameters that govern the energy transport are determined for various interparticle spacings and particle chain lengths using far-field measurements of the collective plasmon modes. Spherical gold nanoparticles with a diameter of 50 nm and an interparticle spacing of 75 nm show an energy attenuation of 6 dB/30 nm. This loss can be reduced by one order of magnitude by a geometry change to spheroidal particles. Using the tip of a near-field optical microscope as a local excitation source and fluorescent nanospheres as detectors, experimental evidence for energy transport over a distance of 0.5 µm is presented for plasmon waveguides consisting of silver rods with a 3:1 aspect ratio.Inhaltsverzeichnis:Table of Contents:Chapter 1Introduction11.1Towards nanoscale optical devices11.2Surface plasmons as a way to overcome the diffraction limit21.3Road map through this thesis5Chapter 2Yagi waveguides82.1Introduction82.2The dispersion of a Yagi waveguide92.3Guiding along linear and corner Yagi arrays: Experiments and simulations142.4Towards active devices: A three-terminal modulator192.5The link to nanoscale plasmon waveguides222.6Conclusions and outlook23Chapter 3Going nanoscale: Point-dipole theory of plasmon waveguides253.1Plasmon resonances in small metal clusters253.2Near-field particle interactions in plasmon waveguides323.3Routing and switching of electromagnetic energy in plasmon waveguides373.4Conclusions and limitations of the dipole model39Chapter 4FDTD simulations of plasmon waveguides414.1Introduction414.2Collective far-field excitation of plasmon waveguides414.3Locally excited plasmon waveguides494.4Tailoring of the guiding properties by particle design554.5Conclusions and outlook57Chapter 5Fabrication and far-field properties of plasmon waveguides625.1Introduction625.2Fabrication of plasmon waveguides635.3Far-field characterization of interparticle coupling in plasmon waveguides675.4Conclusion and outlook: Decrease of waveguide loss by particle design75Chapter 6Local excitation of plasmon waveguides796.1Introduction796.2Transmission NSOM analysis of plasmon waveguides: Facts and artifacts836.3Molecular fluorescence as a probe for localized electromagnetic fields896.4Local excitation and detection of energy transport in plasmon waveguides966.5Conclusions and outlook103Ch.

Lieferung aus: Vereinigtes Königreich Großbritannien und Nordirland, Versandkostenfrei.
Die Beschreibung dieses Angebotes ist von geringer Qualität oder in einer Fremdsprache. Trotzdem anzeigen

Lieferung aus: Deutschland, Versandfertig in 1 - 2 Werktagen, Versandkostenfrei. Tatsächliche Versandkosten können abweichen.
Von Händler/Antiquariat, diplomica.
Pappbilderbuch, Label: Diplomica, Diplomica, Produktgruppe: Book, Publiziert: 2003-07, Studio: Diplomica.

Lieferung aus: Deutschland, Versandfertig in 1 - 2 Werktagen, Versandkostenfrei. Tatsächliche Versandkosten können abweichen.
Von Händler/Antiquariat, Bedey Media GmbH.
Pappbilderbuch, Label: Diplomica, Diplomica, Produktgruppe: Book, Publiziert: 2003-07, Studio: Diplomica.

Guiding of electromagnetic energy in subwavelength periodic metal structures ab 74 EURO.