Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 53 for “"Surface Plasmons"”.
-
Surface plasmons for enhanced metal-semiconductor-metal photodetectors
Surface Plasmon Polaritons (SPPs) are quantized charge density oscillations that occur when a photon couples to the free electron gas of the metal at the interface between a metal and a dielectric. The extraordinary properties of SPP allow for sub-diffraction limit waveguiding and localized field …
-
Propagation, Scattering and Amplification of Surface Plasmons in Thin Silver Films
Plasmons, i.e. collective oscillations of conduction electrons, have a strong influence on the optical properties of metal micro- and nanostructures and are of great interest for novel photonic devices. Here, plasmons on metal-dielectric interfaces are investigated using near-field optical …
-
Manipulation of Light-Matter Interaction in Two-Dimensional Systems via Localized Surface Plasmons
Localized surface plasmons (LSPs), which are collective charge oscillation confined by metallic nanoparticles, gained much interest in the field of optoelectronics due to its ability to confine light down to nanoscale without a diffraction limit. As light-matter interaction in nanoscale is becoming …
-
The plasmonics of a nanosphere on a mirror substrate
… substrate. When this occurs, both the localised surface plasmons on the particle and propagating surface plasmons at both of the interfaces of the substrate can be excited. The reflectivity and permittivity of the substrate plays a key role in the plasmonics of a NPoM. As reflectivity increases, …
-
The study of plasmonics in nanohole metallic metamaterials
… The interaction of incident light (photons) with surface plasmons present in metamaterials results in unique optical properties. Nanohole arrays are a metamaterial consisting of an array of sub-wavelength holes perforated in an optically thin metallic film which resides upon a dielectric material. …
-
FDTD Analysis of Plasmonic and Nanojet Enhanced Photodetectors for Improved Performance
… efficiently confined within a small active area. Surface plasmons play an important role in this phenomenon as surface plasmons can enhance the near-field when excited by a certain wavelength. Resonant surface plasmons can confine strong optical near fields in a sub wavelength volume, this has …
-
Nano-structured platforms as a spectroscopic tool
… much smaller than the optical wavelengths used. Surface charge waves (Surface Plasmons) could be excited when the platform was oriented at specific direction with respect to the incident optical beam. At this point one can demonstrate that fluorescence signals could be amplified. Since the oxide …
-
Fabrication, characterisation, and optical applications of electrochemically deposited nanostructured IrOx films
… thin layer of IrOx film on a nanostructured gold surface was investigated to test whether the electrochromism of the nanostructured IrOx film could be used to alter the surface plasmons of the nanostructured substrate. The nanostructured IrOx film worked as a surface plasmon modulator when its …
-
Plasmonic Nanostructures: Optical Nanocircuits, Tunable Charge Transfer Plasmons, and Properties of Fano Resonant Nanoclusters
… light at the nanoscale via the excitation of surface plasmons, the collective oscillation of conduction band electrons. Surface plasmons can focus electromagnetic field into a subwavelength dimension and sense the change of the local dielectric environment, promising properties for surface …
-
Designing plasmonic structures
… confirming simulation results. Theoretically, surface plasmons (SPs) or more generally the study of light near micro- or nano-fabricated metallic surfaces, play a major role in all structures in this thesis. An effective work-flow in designing "plasmonic" structures is detailed. Various …
-
Deposition of electronic and plasmonic materials inside microstructured optical fibres
… way of coupling optical guided modes into surface plasmons. As a result, they represent a promising platform technology for fully integrated photonic/plasmonic devices. These fibres have demonstrated the enhancement of Raman signals from molecules adsorbed onto the inner metal surfaces and …
-
Using 2D vortex plasmons/phonon polaritons to control electronic selection rules
… effects could be quantum dots interfaced with surface plasmons in-conventional metals.
-
Control of Energy Transfer and Molecular Energetics using Photonic Nanostructures
… organic molecule, diindenoperylene (DIP), to surface plasmons and demonstrate the resulting changes in emission properties at different temperatures.</p>
-
A STUDY FOR THE PROPAGATION OF ELECTROMAGNETIC WAVES OVER IMPERFECT GROUND PLANES BASED ON SCHELKUNOFF INTEGRALS
… waves over imperfectly conducting planar surfaces is proposed. The classical approach for the analysis of this problem uses the Sommerfeld formulation. In Sommerfeld formulation, the wave function corresponding to a point source is expanded in terms of the propagation constants of the …
-
Functional nanostructured plasmonic materials: fabrication, simulation, imaging and sensing applications
Surface plasmons, due to their extreme sensitivity to changes in refractive index occurring at a metal/dielectric interface and their ability to significantly enhance electromagnetic fields near a metal, offer exciting opportunities for real-time, fully label free forms of chemical/biological …
-
Dynamic polarizability and collective modes in narrow-band electron systems
… stiffening the frequency-momentum dispersion of surface plasmons and making it much stronger than that of the underlying narrow-band carriers. Strongly dispersing plasmons pierce through the particle-hole continuum and extend in the forbidden energy band above it. This behavior enables decoupling …
-
Molecular Plasmonics: Graphene Plasmons in the Picoscale Limit
Doped graphene supports surface plasmons in the mid- to far-infrared that are both electrically and spatially tunable. Graphene has been shown to enable greater spatial confinement of the plasmon and fewer losses than typical noble metals. Reduced-dimensional graphene structures, including …
-
Study of Field Enhancement by Spherical Voids in Gold Lattices by Using Three Dimensional Finite Difference Time Domain Simulations
… of the light (field enhancement) near the metal surface. Field enhancement properties of nanostructured metals can significantly enhance efficiency of an upconverter used in solar cells. The objective of this work was to develop an understanding why selfassembled porous and nanoporous spherical …
-
Investigating the plasmonic behaviour of gold nanostructured arrays with finite element method modelling for optical sensing applications
Localised surface plasmons (LSPs) exhibit striking optical behaviour with resonant properties tuned by modification of the host nanostructure’s geometry. This work utilises a novel, plasmonic gold nanorod array surface as a sensing platform for diagnostic applications. Biological species were …
Page 1 of 3