Showing papers by "Olivier J. F. Martin published in 2007"
TL;DR: In this article, the influence of near-field coupling on the formation of collective plasmon modes in a multilayer metallic nanowire array was analyzed and it was shown that the spectral interference between super-and sub-radiant normal modes results in characteristic line shape modifications which are directly controlled by the spacing as well as the alignment of the stacked lattice planes.
Abstract: We analyze the influence of near-field coupling on the formation of collective plasmon modes in a multilayer metallic nanowire array. It is shown that the spectral interference between super- and subradiant normal modes results in characteristic line shape modifications which are directly controlled by the spacing as well as the alignment of the stacked lattice planes. Moreover, a distinct near-field-induced reversal of particle plasmon hybridization is reported. Our numerical findings are in excellent agreement with experimental results.
182 citations
TL;DR: In this paper, the authors presented a numerical study and analytical model of the optical near field diffracted in the vicinity of subwavelength grooves milled in silver surfaces, which can be used for the design and optimization of more elaborate photonic circuits, whose behavior in a large part will be controlled by surface waves.
Abstract: We present a numerical study and analytical model of the optical near field diffracted in the vicinity of subwavelength grooves milled in silver surfaces. The Green’s tensor approach permits the computation of the phase and amplitude dependence of the diffracted wave as a function of the groove geometry. It is shown that the field diffracted along the interface by the groove is equivalent to replacing the groove by an oscillating dipolar line source. An analytic expression is derived from the Green’s function formalism, which reproduces well the asymptotic surface plasmon polariton SPP wave as well as the transient surface wave in the near zone close to the groove. The agreement between this model and the full simulation is very good, showing that the transient “near-zone” regime does not depend on the precise shape of the groove. Finally, it is shown that a composite diffractive evanescent wave model that includes the asymptotic SPP can describe the wavelength evolution in this transient near zone. Such a semianalytical model may be useful for the design and optimization of more elaborate photonic circuits, whose behavior in a large part will be controlled by surface waves.
60 citations
TL;DR: In this article, a simulation of hybrid long-range modes guided by a central metal core and a two-dimensional dielectric slab is performed, and it is shown that these modes are subject to fewer limitations than conventional long-term plasmon modes in terms of field confinement and guiding performance.
Abstract: We perform rigorous simulations of hybrid long-range modes guided by a central metal core and a two-dimensional dielectric slab. We show that these modes are subject to fewer limitations than conventional long-range plasmon modes in terms of field confinement and guiding performance. These hybrid modes may offer substantial improvements for integrated plasmonic components, as illustrated here by the consideration of 90° bends.
40 citations
TL;DR: Overall, the results indicate that SPPs are not very sensitive to technological imperfections and can survive large waveguide interruptions.
Abstract: The tunneling of surface plasmon-polaritons (SPPs) across an interruption in the metallic film supporting them is numerically investigated in details. Both non-symmetrical and symmetrical geometries are considered. A very high tunneling efficiency is calculated for the long-range surface plasmon in the symmetrical geometry, with an amplitude transmission as high as 80% over a 5 microm gap for a 40 nm thick gold film illuminated at lambda= 785 nm. The transmission is somewhat lower in the non-symmetrical geometry. The coupling between the different SPP modes (radiative and non-radiative) in that geometry is also investigated in detail. This coupling depends periodically upon the length of the gap. Overall, the results indicate that SPPs are not very sensitive to technological imperfections and can survive large waveguide interruptions.
37 citations
TL;DR: The forces generated by an electromagnetic field on two coupled gold nanowires at the vicinity of the plasmon resonance wavelength are studied and it is shown that the system behaves like a cavity and pseudo Fabry-Perot modes can be excited between the particles.
Abstract: We study the forces generated by an electromagnetic field on two coupled gold nanowires at the vicinity of the plasmon resonance wavelength. Two different regimes are observed, depending on the separation distance d between the wires. In the near field coupling regime, both attractive and repulsive forces can be generated, depending on d and the illumination wavelength. Furthermore, at the plasmon resonance, it is possible to create forces 100 times larger than the radiation pressure. In the far field coupling regime, both particles are pushed by the incident field. However, the force amplitude applied on each wire is modulated as a function of d, even for large separations. This indicates that the system behaves like a cavity and pseudo Fabry-Perot modes can be excited between the particles. The interaction of these modes with the plasmon resonances of the nanowires, determines the forces on the particles. Around the plasmon resonance wavelength, when the cavity is tuned to the incident light, forces are close to the average value corresponding to the radiation pressure of the incident field. On the other hand, when the cavity is detuned, the particles are retained or pushed anti-symmetrically. We finally study the forces applied on these nanowires in the centre of mass reference frame (CMRF) for the far field coupling regime. For any separation distance d we observe equilibrium positions in the CMRF for at least one illumination wavelength. The stability of these equilibrium positions is discussed in detail.
33 citations
TL;DR: In this article, the authors developed a realistic model able to explore the various functionalities of a plasmon device connected to a single fluorescing molecule and showed that the fluorescence signal evolution from excitation control to relaxation control depending on the incident light power is clearly observed.
Abstract: The new optical concepts currently developed in the research field of plasmonics can have significant practical applications for integrated optical device miniaturization as well as for molecular sensing applications. Particularly, these new devices can offer interesting opportunities for optical addressing of quantum systems. In this article, we develop a realistic model able to explore the various functionalities of a plasmon device connected to a single fluorescing molecule. We show that this theoretical method provides a useful framework to understand how quantum and plasmonic entities interact in a small area. Thus, the fluorescence signal evolution from excitation control to relaxation control depending on the incident light power is clearly observed.
31 citations
01 Jan 2007
TL;DR: In this article, Nanophotonics, Plasmonics Reference EPFL-CONF-175079 Record created on 2012-02-21, modified on 2017-05-10
Abstract: Keywords: Nanophotonics, Plasmonics Reference EPFL-CONF-175079 Record created on 2012-02-21, modified on 2017-05-10
1 citations