Search results for "surface plasmon"

Surface plasmon polariton propagation length: A direct comparison using photon scanning tunneling microscopy and attenuated total reflection

2001

The propagation of surface plasmon polaritons (SPP's) is studied using a photon scanning tunneling microscope (PSTM) and conventional attenuated total reflection (ATR). The PSTM experiment uses localized (focused beam) launching of SPP's at a wavelength of 632.8 nm. Propagation of the SPP is observed as an exponentially decaying tail beyond the launch site and the $1/e$ propagation length is measured directly for a series of Ag films of different thicknesses. The ATR measurements are used to characterize the thin film optical and thickness parameters, revealing, notably, the presence of a contaminating adlayer of ${\mathrm{Ag}}_{2}\mathrm{S}$ of typical dielectric function, $8.7+i2.7,$ and …

Surface plasmon polaritons in metal stripes and wires

2004

Surface plasmon polaritons (SPPs) are collective electron oscillations coupled to a light field which are propagating along the interface of a metal and a dielectric. As a surface wave, SPP modes feature properties essentially different from light-field modes in all dielectric structures. These properties could allow the realization of novel photonic devices that overcome certain limitations of conventional devices. Specifically, the realization of two-dimensional optics and light-field transport in sub-wavelength SPP waveguides seems feasible. In this review we discuss recent experimental advances regarding SPP waveguides, i.e. laterally confined metal thin films that guide SPPs. Electron-…

DEVELOPMENT AND NEAR-FIELD CHARACTERIZATION OF SURFACE PLASMON WAVEGUIDES

2007

Direct observation of localized surface plasmon coupling

1999

We report on the direct observation of localized surface plasmon coupling using a photon scanning tunneling microscope. The surface plasmons are excited in gold nanostructures tailored by electron beam lithography. Electromagnetic energy transfer from a resonantly excited nanoparticle to a nanowire, which is not directly excited by the incident light is observed. Our experimental results appear to be in good agreement with theoretical computations based on Green's dyadic technique.

Local excitation of surface plasmon polaritons at discontinuities of a metal film: Theoretical analysis and optical near-field measurements

2002

Nonresonant excitation of surface plasmon polaritons at discontinuities of a gold film is numerically studied and experimentally observed with scanning near-field optical microscopy. It is shown that surface polaritons can be effectively launched at the edges of a metal film illuminated at an angle of incidence greater than the resonant angle of surface polariton excitation. The electromagnetic near-field distribution over a thin metal film exhibits significantly different features under resonant and nonresonant excitations due to different surface polariton excitation mechanisms. In the latter case the field distribution is determined by the interference of the excitation light and surface…

Controlling Light Confinement by Excitation of Localized Surface Plasmons

2007

Localized surface plasmons can be used to control near-field optical phenomena in the subwavelength range. Specifically, this chaper reviews recent results which show that localized surface plasmons can confine the optical intensity down to nanoscopic dimensions. The discussion first considers how a collection-mode near-field optical microscope can observe the squeezing of the plasmon field of metallic nanostructures deposited on a flat surface. Numerical simulations then provide illustrations of the confined fields associated with nanostructures which are feasible using current microfabrication techniques. Finally, we present arguments which explain how localized surface plasmons can deliv…

Mapping surface plasmon propagation by collection-mode near-field microscopy

2011

Surface plasmon propagation along striped Gold structures has been investigated by collection-mode near-field microscopy, leading to map the field intensity at the structure surface and to assess the system behavior at the nanoscale.

Chapter 3 Surface Plasmon Optics for the Characterization of Biofunctional Architectures

2007

Publisher Summary This chapter describes a wide variety of work employing surface plasmon resonance (SPR), surface plasmon field-enhanced fluorescence spectroscopy (SPFS), and surface plasmon field-enhanced diffraction spectroscopy (SPDS) analysis, specifically for investigations relevant to biofunctional, bio-affinity aspects. The SPR has shown already its impact on interfacial analysis. The combination of these three methods has the potential to generate more information and reveal details of biofunctional interfaces. The versatility of the SPR technique is shown by a vast amount of publications in the past decades; the method has matured into a well-accepted analytical tool for the chara…

NEAR-FIELD OPTICAL EXCITATION AND DETECTION OF SURFACE PLASMONS

2007

Characterization of thermo-optical 2×2 switch configurations made of Dielectric Loaded Surface Plasmon Polariton Waveguides for telecom routing archi…

2012

We report on the characterization of thermo-optic switch structures based on Dielectric Loaded Surface Plasmon Polariton Waveguide for high data bit rate transfer. Performances are extracted by Leakage Radiation Microscopy and compared to numerical results.