Concave Plasmonic Particles: Broad-Band Geometrical Tunability in the Near-Infrared

Berkovitch, Nikolai; Ginzburg, Pavel; Orenstein, Meir

doi:10.1021/nl100222k

Cited by 53 publications

(54 citation statements)

References 22 publications

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“…Similar phenomena occur in optics, where capacitive or conductive couplings between non-touching/touching noble metal particles control the spectral response of localized plasmon resonances [25]. Moreover, the narrowing of the resonance (quality factor increase) is also an attribute of plasmonic resonances [25].…”

Section: Dipoles In a Wire Medium -A Contact Modementioning

confidence: 79%

“…The distinctive difference between these results and the noncontact case is the stronger red shift of the main resonance and its narrowing. The red shift results from effectively longer wire, moreover, the u-band shape of shortened conductors leads to concave geometry, also responsible for the red shift [25]. It should be mentioned that in the contact case the field is more localized within the wire medium which is the reason for Q-factor increase and the corresponding resonances narrowing.…”

Section: Dipoles In a Wire Medium -A Contact Modementioning

confidence: 99%

“…Moreover, the narrowing of the resonance (quality factor increase) is also an attribute of plasmonic resonances [25]. The difference between optical and GHz spectral ranges lies in the nature of the involved electromagnetic currents -in optics polarization currents should be considered instead of the conduction ones at lower frequencies.…”

Section: Dipoles In a Wire Medium -A Contact Modementioning

confidence: 99%

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Controlling electromagnetic scattering with wire metamaterial resonators

et al. 2016

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Manipulation of radiation is required for enabling a span of electromagnetic applications. Since properties of antennas and scatterers are very sensitive to a surrounding environment, macroscopic artificially created materials are good candidates for shaping their characteristics. In particular, metamaterials enable controlling both dispersion and density of electromagnetic states, available for scattering from an object. As the result, properly designed electromagnetic environment could govern waves' phenomena. Here electromagnetic properties of scattering dipoles, situated inside a wire medium (metamaterial) are analyzed both numerically and experimentally. Impact of the metamaterial geometry, dipole arrangement inside the medium, and frequency of the incident radiation on scattering phenomena was studied. It was shown that the resonance of the dipole hybridizes with Fabry-Pérot modes of the metamaterial, giving rise to a complete reshaping of electromagnetic properties. Regimes of controlled scattering suppression and super-scattering were observed. Numerical analysis is in an agreement with experiments, performed at the GHz spectral range. The reported approach to scattering control with metamaterials could be directly mapped into optical and infrared spectral ranges by employing scalability properties of Maxwell's equations.

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Section: Dipoles In a Wire Medium -A Contact Modementioning

confidence: 79%

Section: Dipoles In a Wire Medium -A Contact Modementioning

confidence: 99%

Section: Dipoles In a Wire Medium -A Contact Modementioning

confidence: 99%

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Controlling electromagnetic scattering with wire metamaterial resonators

et al. 2016

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“…1c ). As all sides of the diabolo nanoantenna are not parallel to the incident polarization direction, the electric fi elds can be enhanced evenly along the entire boundary of the structure 32,34 . Furthermore, 260-fold intensity enhancement was achieved at the electric fi eld maximum compared with the incident light intensity.…”

Section: Diabolo Nanoantenna For Nano-optical Vortex Trappingmentioning

confidence: 99%

Low-power nano-optical vortex trapping via plasmonic diabolo nanoantennas

et al. 2011

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Optical vortex trapping can allow the capture and manipulation of micro-and nanometresized objects such as damageable biological particles or particles with a refractive index lower than the surrounding material. However, the quest for nanometric optical vortex trapping that overcomes the diffraction limit remains. Here we demonstrate the fi rst experimental implementation of low-power nano-optical vortex trapping using plasmonic resonance in gold diabolo nanoantennas. The vortex trapping potential was formed with a minimum at 170 nm from the central local maximum, and allowed polystyrene nanoparticles in water to be trapped strongly at the boundary of the nanoantenna. Furthermore, a large radial trapping stiffness, ~ 0.69 pN nm − 1 W − 1 , was measured at the position of the minimum potential, showing good agreement with numerical simulations. This subwavelength-scale nanoantenna system capable of low-power trapping represents a signifi cant step toward versatile, effi cient nano-optical manipulations in lab-on-a-chip devices.

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“…In this work we will employ the localized surface plasmon (LSP) resonances supported by metal nanoparticles made of noble metals 15 . These resonances are solely determined by the particle's shape and surrounding environment and can be engineered and tuned to the desired frequency [16][17][18] .…”

mentioning

confidence: 99%

Analogue of the Quantum Hanle Effect and Polarization Conversion in Non-Hermitian Plasmonic Metamaterials

et al. 2012

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Here we investigate an optical counterpart of the quantum Hanle effect. By employing the concepts of nonhermitian quantum mechanics 7,8 , we have designed an artificial plasmonic "atom" which has a pair of degenerate resonances that split by 3 broken time-reversal symmetry due to the presence of loss. This is a complete optical analogue of the atomic system where initially degenerate atomic states are split when the time-reversal symmetry is broken by the magnetic field 1 . Twodimensional (2D) arrays of these particles can form a new artificial material (metamaterial) with extremely efficient optical activity.Metamaterials provide vast opportunities to manipulate light beams in an uncommon way 11 , promising a wide range of potential applications such as cloaking 12,13 and perfect lensing 14 based on negative index of refraction. In the optical range, the properties of metamaterials rely on plasmonic effects 11 . In this work we will employ the localized surface plasmon (LSP) resonances supported by metal nanoparticles made of noble metals 15 . These resonances are solely determined by the particle's shape and surrounding environment and can be engineered and tuned to the desired frequency [16][17][18] .The basic scheme of the Hanle effect is represented in Fig. 1(a-b). Linearly polarized light, being a superposition of left and right circular polarizations, excites coherently the p-orbitals of an atom, conserving the total angular momentum. The degeneracy between p-states [ Fig. 1(a)] could be removed by an applied static magnetic field [Fig 1(b)]. The excited p-states evolve in time with slightly dissimilar time constants, adding different phases for opposite circular polarizations and, as a consequence, resulting in polarization-unpreserved light scattering. The polarization of the scattered light depends then on the strength of the magnetic field. The plasmonic "atom level" diagram of our optical analogue is shown in Fig. 1(c-d)

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Concave Plasmonic Particles: Broad-Band Geometrical Tunability in the Near-Infrared

Cited by 53 publications

References 22 publications

Controlling electromagnetic scattering with wire metamaterial resonators

Controlling electromagnetic scattering with wire metamaterial resonators

Low-power nano-optical vortex trapping via plasmonic diabolo nanoantennas

Analogue of the Quantum Hanle Effect and Polarization Conversion in Non-Hermitian Plasmonic Metamaterials

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