Laser Trapping of Colloidal Metal Nanoparticles

Lehmuskero, Anni; Johansson, Peter; Rubinsztein‐Dunlop, Halina; Tong, Lianming; Käll, Mikael

doi:10.1021/acsnano.5b00286

Cited by 205 publications

(201 citation statements)

References 136 publications

(373 reference statements)

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“…First, optical forces can be used in laser/optical trapping or optical tweezers. 53,54 The concept of optical trapping is given in Scheme 1. The primary force in these manipulations is a gradient force that moves a particle/molecule to the focal position and maintains the particle at that position (Scheme 1, left).…”

Section: Optically Driven Plasmonic Nanofabricationmentioning

confidence: 99%

Insight into plasmonic hot-electron transfer and plasmon molecular drive: new dimensions in energy conversion and nanofabrication

2017

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Localized surface plasmon resonance (LSPR) of plasmonic nanoparticles and nanostructures has attracted wide attention because the nanoparticles exhibit a strong near-field enhancement through interaction with visible light, enabling subwavelength optics and sensing at the single-molecule level. The extremely fast LSPR decays have raised doubts that such nanoparticles have use in photochemistry and energy storage. Recent studies have demonstrated the capability of such plasmonic systems in producing LSPR-induced hot electrons that are useful in energy conversion and storage when combined with electron-accepting semiconductors. Due to the femtosecond timescale, hot-electron transfer is under intense investigation to promote ongoing applications in photovoltaics and photocatalysis. Concurrently, hot-electron decay results in photothermal responses or plasmonic heating. Importantly, this heating has received renewed interest in photothermal manipulation, despite the developments in optical manipulation using optical forces to move and position nanoparticles and molecules guided by plasmonic nanostructures. To realize plasmonic heating-based manipulation, photothermally generated flows, such as thermophoresis, the Marangoni effect and thermal convection, are exploited. Plasmon-enhanced optical tweezers together with plasmon-induced heating show potential as an ultimate bottom-up method for fabricating nanomaterials. We review recent progress in two fascinating areas: solar energy conversion through interfacial electron transfer in gold-semiconductor composite materials and plasmon-induced nanofabrication.

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Section: Optically Driven Plasmonic Nanofabricationmentioning

confidence: 99%

Insight into plasmonic hot-electron transfer and plasmon molecular drive: new dimensions in energy conversion and nanofabrication

2017

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“…The above equations are generalized to an arbitrary illuminating wavefield expressible by its angular spectrum (28), which introduced in (54) yields…”

Section: Generalization To An Arbitrary Incident Fieldmentioning

confidence: 99%

“…Observations are more difficult to control and to quantitatively interpret with existing models. With few exceptions [34,36], most experimental [27,28] and theoretical [29][30][31][32][33][34]53] studies employ a static formulation, (perhaps following the path of pioneering work [21]), which was shown [37] to be incomplete and not compatible with energy and angular momentum conservation. Only for extremely small (i.e.…”

Section: Introductionmentioning

confidence: 99%

Optical torque: Electromagnetic spin and orbital-angular-momentum conservation laws and their significance

Nieto‐Vesperinas

2015

Phys. Rev. A

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The physics involved in the fundamental conservation equations of the spin and orbital angular momenta leads to new laws and phenomena that are disclosed here. To this end, we analyse the scattering of an electromagnetic wavefield by the canonical system constituted by a small particle, which is assumed dipolar in the wide sense. Specifically, under quite general conditions these laws lead to understanding the contribution and weight of each of those angular momenta to the electromagnetic torque exerted by the field on the object, which is shown to consist of an extinction and a scattering, or recoil, part. This leads to an interpretation of its effect different to that taken up till now by many theoretical and experimental works, and implies that a part of the recoil torque cancels the usually called intrinsic torque which was often considered responsible of the particle spinning. In addition, we obtain the contribution of the spatial structure of the wave to this torque, unknown to this date, showing its effect in the orbiting of the object, and demonstrating that it often leads to a negative torque on a single particle, i.e. opposite to the incident helicity, producing an orbital motion contrary to its spinning. Furthermore, we establish a decomposition of the electromagnetic torque into conservative and non-conservative components in which the helicity and the spin angular momentum play a role analogous to the energy and its flux for electromagnetic forces. These phenomena are illustrated with examples of beams, also showing the difficulties of some paraxial formulations whose fields do not hold the transversality condition.

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“…Combination of these two stabilizers is reliable while working with QDs of several nm size. Molar concentration of QDs in the samples that undergone laser irradiation was 5·10 -2 mole/m 3 , that corresponds to the mean inter-QD distance 20 nm. Excitonic absorption band of CdTe QDs ensembles in solutions is usually 30 nm wide; however, luminescence measurements show that individual QD linewidth is of order 3 nm [10].…”

Section: Methodsmentioning

confidence: 99%

“…Introduction Irradiation of ensembles of micro-and nanoparticles with optical radiation leads to various effects allowing the control of their motion. One of these effects is optical binding, being the effect based on optically induced interaction between particles [1], in contrast to optical trapping [2,3] which is based on forces raised from interaction of individual particles with light. In optical binding effect, electric field of a light wave polarizes particles, and ac polarizations of particles interact each other.…”

mentioning

confidence: 99%

Laser-induced wavelength-controlled self-assembly of colloidal quasi-resonant quantum dots

Tsipotan¹,

Gerasimova²,

Slabko³

et al. 2016

Opt. Express

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1. Introduction Irradiation of ensembles of micro-and nanoparticles with optical radiation leads to various effects allowing the control of their motion. One of these effects is optical binding, being the effect based on optically induced interaction between particles [1], in contrast to optical trapping [2,3] which is based on forces raised from interaction of individual particles with light. In optical binding effect, electric field of a light wave polarizes particles, and ac polarizations of particles interact each other. For interparticle distances much smaller than the wavelength this can be treated as the local field effect, i.e. external ac electric field acting onto individual particle becomes modified by the account of the field produced by neighboring particles. Optically induced interaction of particles becomes noticeable at certain level of light intensity when the potential energy associated with this interaction is comparable with kinetic energy of Brownian motion or with the potential energy of a barrier typically used to stabilize colloid solutions of NPs' ensembles. In recent studies, the most attention was devoted to the investigation of metallic NPs interacting with light. Particularly, calculation technique for modeling the dynamics of metal NPs was elaborated [4]. High precision manipulation of multiple metallic NPs using optical binding force induced by off-resonant low-power laser was recently demonstrated at distances up to several microns [5]. Alternatively, self-assembly of metal NPS at the subwavelength scale due to plasmonic interaction was obtained under strong off-resonant cw laser illumination, as was deduced from Raman and Rayleigh scattering [6]. Somehow similar result was observed in [7] where hybridization of metal NPs plasmonic resonance was observed in scattering when NPs were confined in an optical trap. Employing the plasmonic resonance of metal NPs with the laser frequency is widely recognized as means for enhancement of optically induced interaction between metallic NPs, as theoretically investigated [8,9]. Moreover, it was shown in these two papers that formation of NPs' clusters with pre-defined geometry is possible via proper choice of laser wavelength and polarization. Characteristic potential well depths for silver NPs, according to [9], are less than ten energies of thermal motion at laser field strengths close to metal NPs' breakdown threshold. More deep potential wells could be obtained when NPs with narrower resonant widths are under the self-assembly. Resonant widths of excitons in semiconductor QDs are two orders of magnitude narrower than plasmonic resonances in metals [10]. Formation of QDs' structures under optical irradiation due to various non-electrodynamical mechanisms were studied, e.g. in [11][12][13]. Surprisingly, no experimental attempts were done up to date to perform electrodynamically-driven laser-induced self-assembly of semiconductor nanoparticles, that may be of interest for quantum information, spintronics, single-electron transport, and sens...

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Laser Trapping of Colloidal Metal Nanoparticles

Cited by 205 publications

References 136 publications

Insight into plasmonic hot-electron transfer and plasmon molecular drive: new dimensions in energy conversion and nanofabrication

Insight into plasmonic hot-electron transfer and plasmon molecular drive: new dimensions in energy conversion and nanofabrication

Optical torque: Electromagnetic spin and orbital-angular-momentum conservation laws and their significance

Laser-induced wavelength-controlled self-assembly of colloidal quasi-resonant quantum dots

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