19,701 research outputs found
Recursive T matrix algorithm for resonant multiple scattering: Applications to localized plasmon excitations
A matrix balanced version of the Recursive Centered T Matrix Algorithm
(RCTMA) applicable to systems possessing resonant inter-particle couplings is
presented. Possible domains of application include systems containing
interacting localized plasmon resonances, surface resonances, and photonic jet
phenomena. This method is of particular interest when considering modifications
to complex systems. The numerical accuracy of this technique is demonstrated in
a study of particles with strongly interacting localized plasmon resonances
Holography utilizing surface plasmon resonances
A holographic recording medium with a substrate which has a diffraction grating composed of a number of spaced line ridges on the surface is discussed. The first layer consists of a metal with a plasma wavelength shorter than that of the selected light source. A second layer, or coating, on top of the first layer consists of a thin film of photosensitive emulsion. A diagram of the device is provided. The principles of operation are explained
Multiple plasmon resonances from gold nanostructures
Understanding and controlling plasmon resonances from metallic nanoscale structures have been the focus of much attention recently, with applications including local surface plasmon resonance sensing, surface enhanced Raman spectroscopy, and negative refractive index materials. In this letter the authors demonstrate the fabrication of uniform arrays of split rings from gold and show that such structures are capable of supporting multiple plasmon resonances. The authors show that up to five plasmon resonances can be identified and use finite difference time domain modeling and absorption spectroscopy to fully characterize and identify each resonance. The implications of higher order surface plasmon resonances for sensing are discussed
Enhanced transmission through arrays of subwavelength holes in gold films coated by a finite dielectric layer
Enhanced transmissions through a gold film with arrays of subwavelength holes
are theoretically studied, employing the rigid full vectorial three dimensional
finite difference time domain method. Influence of air-holes shape to the
transmission is firstly studied, which confirms two different resonances
attributing to the enhanced transmission: the localized waveguide resonance and
periodic surface plasmon resonances. For the film coated with dielectric
layers, calculated results show that in the wavelength region of interest the
localized waveguide resonant mode attributes to sensing rather than the
periodic gold-glass surface plasmon mode. Although the detected peak is fairly
broad and the shift is not too pronounced, we emphasize the contribution for
sensing from the localized waveguide resonant mode, which may opens up new ways
to design surface plasmon based sensors.Comment: 11 pages including 4 figures. Accepted for JEOS:R
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