Controlling surface plasmon excitation of pair arrays of metallic nanocylinders
ABSTRACT Surface plasmon excitation of pair arrays of silver nanocylinders is studied using finite-difference time-domain simulations.
Strong local fields are generated around the nanocylinders due to excitation of localized surface plasmon and electromagnetic
fields are confined effectively in the gaps between the nanocylinders. Surface plasmon resonance and local-field enhancement
of two-pair arrays can be controlled by changing the illumination direction of the incident light due to induced asymmetric
polarization charges. Complex resonant modes could be excited with increasing number of silver nanocylinder pairs. Selective
local-field enhancement is observed in the gaps of the pairs by changing the interpair distance of four-pair arrays.
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ABSTRACT: In this paper, the surface plasmon resonance (SPR) wavelength of arrangement-dependent gold liner nanochain, square arranged nanoarray and curved nanochain are theoretically studied. Dipolar electrostatic and electrodynamics is concerned. For the liner chains, with increase number of the sphere, the plasmon peak wavelength varies non-monotonically in p-polarization, whereas it varies monotonically in s-polarization. For the square arranged array, it has greater resonance wavelength variations, and resonance wavelength can change from red shift to blue shift simply by changing the distance. The behavior of resonance wavelength for curved chain is similar to that of liner chain, and curved chain can be considered as a mixture of several short liner chains. The real part of additional field factor affects the resonance wavelength, and the real electrodynamics’ part of additional field factor causes non-monotonic shift of resonance wavelength. According to these results, controlling the resonance wavelength by changing the shape of nanoarray is attainable.The European Physical Journal D 01/2011; 64(2):339-346. · 1.51 Impact Factor
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ABSTRACT: The optical near-field surface plasmon effects of a triangular system of silver nanoshell cylinders are numerically studied using the two-dimensional finite difference time domain method. The dependence of interparticle distance, shell thickness of the cylinder, dielectric constant of shell core as well as embedding medium, and orientation of the optical source plane on the plasmonic resonances of the nanocylinder shells is studied. The plasmonic resonances are found to have strong dependence on the interparticle distance. As the size of the particle is increased, the field intensity peak shows a redshift. The resonance condition varies with the dielectric constant of the environment as well as the core. In addition, the orientation of the incident source plane has a significant role in the near-field intensity distribution. Since the near-field intensity has the same trend as that of the scattering cross section, the results can be used in the design of various applications like sensing, antennas, and waveguides.Applied Optics 11/2011; 50(33):6277-82. · 1.69 Impact Factor
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ABSTRACT: Local field surface plasmon excitation of pair arrays of silver nanospheres was studied using three-dimensional finite-difference time-domain method. The near-field enhancement was associated with the radius of nanosphere and the incident wavelength, the highest of which always appeared in the penultimate gaps, regardless of the number of the pairs. The surface plasmon resonance could be controlled and tuned by radius of nanosphere and incident wavelength.Optics Communications 01/2009; 282(19):4005-4008. · 1.44 Impact Factor