Optical forces between coupled plasmonic nanoparticles near metal surfaces and negative index material waveguides

Vlack, C. Van; Yao, Peijun; Hughes, Stephen

doi:10.1103/physrevb.83.245404

Cited by 12 publications

(13 citation statements)

References 69 publications

(103 reference statements)

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“…Nanostructures can induce large variations in many fundamental quantum phenomena such as the rate of spontaneous emission 1 , 2 , the photonic Lamb shift of resonance frequencies and Casimir-Polder forces 3 . These effects have been extensively investigated with noble metal nanoparticles 4 , 5 in the visible range.…”

Section: Introductionmentioning

confidence: 99%

Gap enhanced fluorescence as a road map for the detection of very weakly fluorescent emitters from visible to ultraviolet

McArthur

Papoff²

2017

Sci Rep

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We analyze the enhancement of the rates of both the emission and the far field radiation for dipoles placed in the gap between a metallic nanorod, or nanosphere, and a metallic substrate. For wavelengths between 150 nm and 650 nm, the response of the gapped nanostructures considered in this work is dominated by few principal modes of the nanoparticle, which include self-consistently the effect of the substrate. For wavelengths shorter than 370 nm, the far field radiative enhancements of aluminum nanostructures are significantly higher than those for gold or silver. With aluminum, bright mode resonances are tunable over tens or hundreds of nanometers by changing the size of the nanoparticle and have far field radiative enhancements of up to three orders of magnitude. These results provide a road map to label-free detection of many emitters too weakly fluorescent for present approaches.

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Section: Introductionmentioning

confidence: 99%

Gap enhanced fluorescence as a road map for the detection of very weakly fluorescent emitters from visible to ultraviolet

McArthur

Papoff²

2017

Sci Rep

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“…Furthermore, an additional term, which is proportional to the gradient of the scattering Green function of the structure, appears in the time-averaged total force. It should be noted that defining the effective polarizability based on the Green function has already been reported in literature [41][42][43][44][45]. The main contribution of this paper is to show how the backaction field modifies different force terms, and how the new force term associated with the gradient of the scattering Green function could be the significant factor in determining the overall optical force.…”

Section: Introductionmentioning

confidence: 79%

Inclusion of the backaction term in the total optical force exerted upon Rayleigh particles in nonresonant structures

Abbassi

Mehrany

2018

Phys. Rev. A

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In this paper, we investigate the impact of the electromagnetic scattering caused by other objects in nonfree space on the time averaged force exerted upon a Rayleigh particle, which is conventionally referred to as the backaction effect. We show that backaction modifies the gradient force, radiation pressure, and spin curl force exerted upon Rayleigh particles, and gives rise to an additional force term which stems from the gradient of the backaction field in nonfree space. As a numerical example, we look into the trapping of a dielectric nanoparticle at the center of curvature of a spherical mirror, and study how it is affected by the backaction effect. We show that backaction can enhance the force exerted upon the particle, reshape the trapping potential, and shift the equilibrium position of the particle.

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“…So far only two works 20 , 21 , as far as of our knowledge, have studied the behavior of binding force for on-axis spherical heterodimers . Though the behavior and reversal of near field optical binding force for spherical plasmonic on-axis homodimers 22 – 26 (due to bonding and anti-bonding modes without any substrate) have been studied comprehensively, such detailed investigations lack for on-axis 20 , 21 and off-axis spherical heterodimers . Here off-axis means end-fire 20 and nearly end-fire configuration [cf.…”

Section: Introductionmentioning

confidence: 99%

Plasmonic Spherical Heterodimers: Reversal of Optical Binding Force Based on the Forced Breaking of Symmetry

Mahdy

Danesh

Zhang

et al. 2018

Sci Rep

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The stimulating connection between the reversal of near-field plasmonic binding force and the role of symmetry-breaking has not been investigated comprehensively in the literature. In this work, the symmetry of spherical plasmonic heterodimer-setup is broken forcefully by shining the light from a specific side of the set-up instead of impinging it from the top. We demonstrate that for the forced symmetry-broken spherical heterodimer-configurations: reversal of lateral and longitudinal near-field binding force follow completely distinct mechanisms. Interestingly, the reversal of longitudinal binding force can be easily controlled either by changing the direction of light propagation or by varying their relative orientation. This simple process of controlling binding force may open a novel generic way of optical manipulation even with the heterodimers of other shapes. Though it is commonly believed that the reversal of near-field plasmonic binding force should naturally occur for the presence of bonding and anti-bonding modes or at least for the Fano resonance (and plasmonic forces mostly arise from the surface force), our study based on Lorentz-force dynamics suggests notably opposite proposals for the aforementioned cases. Observations in this article can be very useful for improved sensors, particle clustering and aggregation.

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Optical forces between coupled plasmonic nanoparticles near metal surfaces and negative index material waveguides

Cited by 12 publications

References 69 publications

Gap enhanced fluorescence as a road map for the detection of very weakly fluorescent emitters from visible to ultraviolet

Gap enhanced fluorescence as a road map for the detection of very weakly fluorescent emitters from visible to ultraviolet

Inclusion of the backaction term in the total optical force exerted upon Rayleigh particles in nonresonant structures

Plasmonic Spherical Heterodimers: Reversal of Optical Binding Force Based on the Forced Breaking of Symmetry

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