Electrodynamics study of plasmonic bonding and antibonding forces in a bisphere

Ng, Jack; Tang, Ross Chin Hang; Chan, Che Ting

doi:10.1103/physrevb.77.195407

Cited by 40 publications

(67 citation statements)

References 29 publications

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“…There have so far only been a few experimental studies concerning metal colloids, 24,44,46 but several theoretical investigations of such effects have been reported in the literature. 37,41,[47][48][49][50][51][52][53][54][55][56][57] For example,…”

Section: Optical Torquesmentioning

confidence: 98%

Laser Trapping of Colloidal Metal Nanoparticles

et al. 2015

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Optical trapping using focused laser beams (laser tweezers) has been proven to be extremely useful for contactless manipulation of a variety of small objects, including biological cells, organelles within cells, and a wide range of other dielectric micro- and nano-objects. Colloidal metal nanoparticles have drawn increasing attention in the field of optical trapping because of their unique interactions with electromagnetic radiation, caused by surface plasmon resonance effects, enabling a large number of nano-optical applications of high current interest. Here we try to give a comprehensive overview of the field of laser trapping and manipulation of metal nanoparticles based on results reported in the recent literature. We also discuss and describe the fundamentals of optical forces in the context of plasmonic nanoparticles, including effects of polarization, optical angular momentum, and laser heating effects, as well as the various techniques that have been used to trap and manipulate metal nanoparticles. We conclude by suggesting possible directions for future research.

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Section: Optical Torquesmentioning

confidence: 98%

Laser Trapping of Colloidal Metal Nanoparticles

et al. 2015

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“…This is often referred to as the optical binding force (OBF) [14]. The OBF between plasmonic nanoparticles is substantially related to the optical near field in terms of both strength and spatial distribution, thus can be dramatically enhanced by surface plasmon resonance [15][16][17][18][19]. It is interesting to study the impacts on the OBF by Fano resonance in plasmonic nanostructures.…”

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confidence: 99%

Multiple reversals of optical binding force in plasmonic disk-ring nanostructures with dipole-multipole Fano resonances

Zhang

Xiao

2013

Opt. Lett.

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We study the optical far-field and near-field characteristics, and the optical force effects of plasmonic disk-ring nanostructures. There are multiple Fano features resulting from the scattering interferences of the hybridized modes from the disk's dipole and the ring's higher-order modes. In particular, it is found that the optical binding force between the disk and the ring shows multiple sign reversals spectrally, from the dipole-quadrupole regime up to the dipole-decapole regime. We show that the zero-force points can be categorized into two types: the positive-to-negative ones resulting from the Fano dip and the negative-to-positive ones associated with the transitions between dipole-multipole modes. The multiple sign reversals of the optical forces are tunable by the geometrical size and gap of the disk and ring. Such characters make it possible to organize unusual optical matters from individual plasmonic nanoparticles.

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“…14 that at the assumed intensity, the attractive bonding force is on the order of 0.5 pNμm , which is approximately 50 times stronger than the anti-bonding force (~0.01 pNμm ). Moreover, the already weak anti-bonding force will be further reduced by the absorption of circularly polarized incident wave, which induces an absorption torque of approximately 0.005 pNμm per cluster.…”

Section: Resultsmentioning

confidence: 91%

Optical Twist Induced by Plasmonic Resonance

Wang

Cui

et al. 2016

Sci Rep

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Harvesting light for optical torque is of significant importance, owing to its ability to rotate nano- or micro-objects. Nevertheless, applying a strong optical torque remains a challenging task: angular momentum must conserve but light is limited. A simple argument shows the tendency for two objects with strong mutual scattering or light exchange to exhibit a conspicuously enhanced optical torque without large extinction or absorption cross section. The torque on each object is almost equal but opposite, which we called optical twist. The effect is quite significant for plasmonic particle cluster, but can also be observed in structures with other morphologies. Such approach exhibits an unprecedentedly large torque to light extinction or absorption ratio, enabling limited light to exert a relatively large torque without severe heating. Our work contributes to the understanding of optical torque and introduces a novel way to manipulate the internal degrees of freedom of a structured particle cluster.

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Electrodynamics study of plasmonic bonding and antibonding forces in a bisphere

Cited by 40 publications

References 29 publications

Laser Trapping of Colloidal Metal Nanoparticles

Laser Trapping of Colloidal Metal Nanoparticles

Multiple reversals of optical binding force in plasmonic disk-ring nanostructures with dipole-multipole Fano resonances

Optical Twist Induced by Plasmonic Resonance

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