Plasmon hybridization in metallic nanotubes

Moradi, Afshin

doi:10.1016/j.jpcs.2008.08.004

Cited by 47 publications

(42 citation statements)

References 19 publications

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“…In [25], plasmon hybridization within hollow metallic nanotubes was investigated; however, retardation effects were not considered. To derive the retarded plasmon frequency for a metallic nanotube, we assume that the nanotubes are much longer than their cross-sectional diameters so they can be considered as infinitely long.…”

Section: Nanotubementioning

confidence: 99%

The effects of retardation on plasmon hybridization within metallic nanostructures

Turner

Hossain

2010

New J. Phys.

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Section: Nanotubementioning

confidence: 99%

The effects of retardation on plasmon hybridization within metallic nanostructures

Turner

Hossain

2010

New J. Phys.

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“…This model is valid in a size regime where retardation effects are neglected and so the nanotubes described by the hybridization approach have diameters <40 nm. 12,13 It is important to note that, in this size regime, interwall coupling is strong.…”

Section: Discussionmentioning

confidence: 99%

“…Subsequently, Moradi built upon the plasmon hybridization model and adapted it specifically to tubular metallic nanostructures with concentric and nonconcentric cores. 12,13,26 In this model, the plasmon resonances in metallic nanotubes can be described in terms of a hybridization of plasmon resonances in capillary and wire geometries. This hybridization results in the splitting of the plasmon resonances into a low-energy symmetric mode and a higher-energy antisymmetric mode.…”

Section: Discussionmentioning

confidence: 99%

“…coupling between the inner and outer surface of the wall) is strong, and surface plasmon hybridization models can be applied (quasistatic regime). [9][10][11][12][13] For larger ID structures (ID > 100 nm) where WT is still <50 nm but intrawall coupling is weak, the effects of changing wall thickness are likely to dominate. In that size regime, the structure becomes more comparable to insulator-metalinsulator (IMI) slab waveguides, supporting both propagating surface plasmon polariton (SPP) and photonic modes.…”

Section: Introductionmentioning

confidence: 99%

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Surface plasmon and photonic mode propagation in gold nanotubes with varying wall thickness

2011

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Gold nanotube arrays are synthesized with a range of wall thicknesses (15 to >140 nm) and inner diameters of ∼200 nm using a hard-template method. A red spectral shift (>0.39 eV) with decreasing wall thickness is observed in dark-field spectra of nanotube arrays and single nanowire/nanotube heterostructures. Finite-difference-timedomain simulations show that nanotubes in this size regime support propagating surface plasmon modes as well as surface plasmon ring resonances at visible wavelengths (the latter is observed only for excitation directions normal to the nanotube long axis with transverse polarization). The energy of the surface plasmon modes decreases with decreasing wall thickness and is attributed to an increase in mode coupling between propagating modes in the nanotube core and outer surface and the circumference dependence of ring resonances. Surface plasmon mode propagation lengths for thicker-walled tubes increase by a factor of ∼2 at longer wavelengths (>700 nm), where ohmic losses in the metal are low, but thinner-walled tubes (30 nm) exhibit a more significant increase in surface plasmon propagation length (by a factor of more than four) at longer wavelengths. Additionally, nanotubes in this size regime support a photonic mode in their core, which does not change in energy with changing wall thickness. However, photonic mode propagation length is found to decrease for optically thin walls. Finally, correlations are made between the experimentally observed changes in dark-field spectra and the changes in surface plasmon mode properties observed in simulations for the various gold nanotube wall thicknesses and excitation conditions.

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“…t ð2Þ n m 2 x 2 h 2 J 0 n x 2 h 2 ð Þþq ð2Þ n n cos fJ n x 2 h 2 ð ÞÀp ð2Þ n m 2 x 2 h 2 Y 0 n x 2 h 2 ð Þ À w ð2Þ n n cos fY n x 2 h 2 ð Þþb nII x 2 sH ð1Þ n 0 x 2 s ð Þ þ ia nII cos fnH ð1Þ n x 2 s ð Þ¼x 2 sJ 0 n x 2 s ð Þ; (30) ia nII x 2 s ð Þ 2 H ð1Þ n x 2 s ð Þ þq ð2Þ n x 2 h 2 ð Þ 2 J n x 2 h 2 ð Þ À w ð2Þ n x 2 h 2 ð Þ 2 Y n x 2 h 2 ð Þ ¼ 0:…”

Section: Electromagnetic Scattering Modelmentioning

confidence: 99%

Localized surface plasmon resonance properties of two-layered gold nanowire: Effects of geometry, incidence angle, and polarization

Liu

2011

Journal of Applied Physics

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The extinction spectra of two-layered gold nanowires (TGNWs) have been calculated by using the vector wave function method. When the polarization direction of incident light is perpendicular to the incidence plane, it is found with increasing the incidence angle that the dipole resonance wavelength of TGNW shows a decrease, whereas the full-width at half-maximum (FWHM) for the dipole resonance peak decreases. With decreasing the shell thickness or increasing the dielectric constant of the inner core, the localized surface plasmon resonance (LSPR) of TGNW shows a distinct redshift, whereas the FWHM of the dipole peak increases. When the polarization direction of incident light is parallel to the incident plane, the LSPR in TGNW gradually appears with decreasing incidence angle and can be modulated by the geometry. We have ascribed the variations of the LSPR in TGNW to the competition between the variations of phase retardation and oscillation electrons.

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Plasmon hybridization in metallic nanotubes

Cited by 47 publications

References 19 publications

The effects of retardation on plasmon hybridization within metallic nanostructures

The effects of retardation on plasmon hybridization within metallic nanostructures

Surface plasmon and photonic mode propagation in gold nanotubes with varying wall thickness

Localized surface plasmon resonance properties of two-layered gold nanowire: Effects of geometry, incidence angle, and polarization

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