Plasmon hybridization in metallic nanotubes with a nonconcentric core

Moradi, Afshin

doi:10.1016/j.optcom.2009.05.016

Cited by 23 publications

(16 citation statements)

References 10 publications

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“…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%

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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Section: Discussionmentioning

confidence: 99%

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

2011

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“…Such coupling provides a rich range of modes, previously shown theoretically and experimentally in concentric spherical gold nanoshells 10,37 and theoretically in nonconcentric structures. 11,12,38 Here, the resonance around 2.1 eV has a high loss probability near the inner void/metal interface, located at the center-left for the corner state (Figure 4a), and at one-quarter and three-quarters of the nanorod length for the center and split states (Figure 4b,c). This mode is attributed to a bonding quadrupolar resonance.…”

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confidence: 97%

Reversible Shape and Plasmon Tuning in Hollow AgAu Nanorods

et al. 2016

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The internal structure of hollow AgAu nanorods created by partial galvanic replacement was manipulated reversibly, and its effect on optical properties was mapped with nanometer resolution. Using the electron beam in a scanning transmission electron microscope to create solvated electrons and reactive radicals in an encapsulated solution-filled cavity in the nanorods, Ag ions were reduced nearby the electron beam, reshaping the core of the nanoparticles without affecting the external shape. The changes in plasmon-induced near-field properties were then mapped with electron energy-loss spectroscopy without disturbing the internal structure, and the results are supported by finite-difference time-domain calculations. This reversible shape and near-field control in a hollow nanoparticle actuated by an external stimulus introduces possibilities for applications in reprogrammable sensors, responsive materials, and optical memory units. Moreover, the liquid-filled nanorod cavity offers new opportunities for in situ microscopy of chemical reactions.

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“…Also, plasmon hybridization in symmetry-broken metallic nanotubes are discussed by us in Ref. [15]. Furthermore, Ekeroth and Lester [16,17] studied the optical characteristics of metallic nanotubes with broken symmetry using the integral method.…”

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Asymmetry Effects in Optical Properties of a Gold Nanotube

Moradi

2021

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Asymmetry effects in optical properties of an infinitely long gold nanotube is studied within the framework of the quasi-static approximation. In this way, incident, scattered and transmitted fields are represented with the appropriate electrostatic potentials in the cylindrical coordinates. The problem is investigated using a boundary-value approach. The expressions for the polarizability and dispersion of surface plasmons of the system are derived and numerical results, in the wavelength region 500 nm to 1000 nm, show that instead of the one well-known resonance peak of the nanotube, one pair of resonance peaks appear, as a result of the coupling between the dipole and quadrupole modes. Then, scattering, absorption and extinction widths of the system are formulated. Also, the effective dielectric function of a composite of aligned symmetry-broken gold nanotubes is presented.

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Plasmon hybridization in metallic nanotubes with a nonconcentric core

Cited by 23 publications

References 10 publications

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

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

Reversible Shape and Plasmon Tuning in Hollow AgAu Nanorods

Asymmetry Effects in Optical Properties of a Gold Nanotube

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