Shape effects in tapered metal rods during adiabatic nanofocusing of plasmons

Vogel, Michael; Gramotnev, Dmitri K.

doi:10.1063/1.3309409

Cited by 24 publications

(16 citation statements)

References 51 publications

(107 reference statements)

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“…Recently, Vogel and Gramotnev theoretically investigated nanofocusing of SPPs in tapered metal nanorods with convex and concave perturbations of the conical shape under the adiabatic approximation conditions [325]. It is demonstrated that the nanorod with a tapered convex shape is more efficient in achieving larger local field enhancements at the tip than a nanorod with a concave shape.…”

Section: Nanorodsmentioning

confidence: 99%

Nanostructures for surface plasmons

Zhang

2012

Adv. Opt. Photon.

115

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Surface plasmons (SPs) are electromagnetic excitations existing at the interface between a metal and a dielectric material. Control and manipulation of light based on SPs at the nanometer scale offers significant advantages in nanophotonic devices with very small elements, since the peculiar properties of SPs can be tailored by construction of nanostructures with various interfaces between metals and dielectric materials. Recent progress in nanostructures for SPs is reviewed. Resonance frequencies or wavelengths of SPs can be tuned by design of metal nanostructures, such as nanoparticles, nanorods, nanowires, nanosheets, and nanodisks. Moreover, SP resonance modes can also be tuned by control of the shapes and sizes of nanostructures, where the resonance modes include longitudinal and transversal resonances, dipolar and multipolar resonances, and Fano resonances. Based on SP coupling for metal nanostructures, metal-semiconductor nanostructures, metal-dielectric nanostructures, and metal-polymer nanostructures, propagating and guiding of SP can be achieved through the metal nanostructures and the hybrid structures. Additionally, metal nanostructures exhibit remarkable field enhancement effects (e.g., local near-field enhancement, and optical transmission enhancement) due to SP coupling. Furthermore, SP nanostructures perform unique focusing and imaging characteristics at the nanometer scale beyond the diffraction limit. Tailoring SPs by control of the nanostructures is expected to be used for design and development of high-performance optical components and circuits, which offer both potential and challenges for new generations of nanophotonic devices.

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Section: Nanorodsmentioning

confidence: 99%

Nanostructures for surface plasmons

Zhang

2012

Adv. Opt. Photon.

115

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“…Another group of papers on the SPP on curved interfaces deals with numerical methods, see, for example, [16] and [17].…”

Section: Introductionmentioning

confidence: 99%

Asymptotics of surface plasmons on curved interface

Perel

Zaika

2011

Proceedings of the International Conference Days on Diffraction 2011

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Surface plasmon polaritons (SSP), moving along a smooth curved interface between two isotropic media with slowly varying dielectric permittivities and magnetic permeabilities and supporting SSP, are studied theoretically. Solutions of Maxwell equations are investigated within a small wavelength limit in the boundary layer of the wavelength order near the surface. An explicit asymptotic formula for an EM wave traveling along geodesics on the surface is obtained. An exponential factor reflects the distinction between the planar and curved cases. The curvature-dependent correction term in the exponent demonstrates a strong dependence on the transverse curvature and a weak dependence on the longitudinal curvature. The closer the parameters to the resonance case, the more pronounced this tendency. It is found that the attenuation of the SPP in the case of lossy media may be reduced by changing the curvature. If the signs of the magnetic permeability of the medium on both sides of the interface are opposite, the surface magnetic plasmon polariton may propagate. Its short-wavelength asymptotics is found.

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“…Nano-gaps can be used for various trapping applications [2][3][4][5][6][7][8][9][10][11][12] as already demonstrated with cells 13 and conducting molecules 14 efficiently and without damage to biological material, due to their ability to produce strong light intensity gradients with low power. 15 Nano-gaps in metal nano-particles on dielectric substrates are promising for nano-focusing and nonlinear plasmonics, [16][17][18][19] as the localized surface plasmon resonance (LSPR) of particles is used to achieve a boost of sensitivity by field enhancement enabling single-molecule detection 20 , tweezing 21,22 , and can find applications in controlled polymerization on nano-scale [23][24][25][26] and micro-electrochemistry. 27 We developed bow-tie nano-antennas defined by electron-beam lithography (EBL) both with rounded shapes and fractal patterns designed to achieve broadband field enhancement from visible wavelength pushing to THz.…”

Section: Introductionmentioning

confidence: 99%

Tailoring plasmonic nanoparticles and fractal patterns

Rosa

Juodkazis

2011

SPIE Proceedings

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We studied new three-dimensional tailoring of nano-particles by ion-beam and electron-beam lithographies, aiming for features and nano-gaps down to 10 nm size. Electron-beam patterning is demonstrated for 2D fabrication in combination with plasmonic metal deposition and lift-off, with full control of spectral features of plasmonic nano-particles and patterns on dielectric substrates. We present wide-angle bow-tie rounded nano-antennas whose plasmonic resonances achieve strong field enhancement at engineered wavelength range, and show how the addition of fractal patterns defined by standard electron beam lithography achieve light field enhancement from visible to far-IR spectral range and scalable up towards THz band. Field enhancement is evaluated by FDTD modeling on full-3D simulation domains using complex material models, showing the modeling method capabilities and the effect of staircase approximations on field enhancement and resonance conditions, especially at metal corners, where a minimum rounding radius of 2 nm is resolved and a five-fold reduction of spurious ringing at sharp corners is obtained by the use of conformal meshing

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Shape effects in tapered metal rods during adiabatic nanofocusing of plasmons

Cited by 24 publications

References 51 publications

Nanostructures for surface plasmons

Nanostructures for surface plasmons

Asymptotics of surface plasmons on curved interface

Tailoring plasmonic nanoparticles and fractal patterns

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