Tunable optical pulling force mediated by resonant electromagnetic coupling

Guo, Guangtao; Feng, Tianhua; Xu, Yi

doi:10.1364/ol.43.004961

Cited by 21 publications

(22 citation statements)

References 45 publications

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“…In addition, since our laser pulses have an ultra-short duration (~94 fs), the time-averaged optical force by the pulsed laser can be approximated 39 by that from a continuous laser with the same central frequency and power density (see Supplementary Note 5). We calculate electromagnetic field distributions at various r nb , θ, and φ using the finite element method (FEM) and then calculate F z using the Maxwell stress tensor 20,27 . More details are provided in the "Method" section.…”

Section: Resultsmentioning

confidence: 99%

“…Optical forces on an object due to the exchange of photon momentum with the object [17][18][19][20][21][22][23][24][25][26][27] can move nanoswimmers/ microswimmers along the beam direction. Light propulsion has unique advantages like wireless control, high spatial and temporal precision, and instant response 28 .…”

mentioning

confidence: 99%

“…However, the achieved moving speed is only~0.5 body-length s −1 , and the same strategy may not be applicable to objects in homogenous media, which are the cases for most nanoswimmers/microswimmers. Theoretically, an object in homogenous medium can also be pulled by a single planewave if the object has certain unique optical configurations to enable either optical gain 25,26 or near-field electromagnetic coupling between dielectric-metallic NP dimers 27 . However, the experimental demonstration in homogenous media is still lacking.…”

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confidence: 99%

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Ballistic supercavitating nanoparticles driven by single Gaussian beam optical pushing and pulling forces

2020

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Directed high-speed motion of nanoscale objects in fluids can have a wide range of applications like molecular machinery, nano robotics, and material assembly. Here, we report ballistic plasmonic Au nanoparticle (NP) swimmers with unprecedented speeds (~336,000 μm s −1) realized by not only optical pushing but also pulling forces from a single Gaussian laser beam. Both the optical pulling and high speeds are made possible by a unique NP-laser interaction. The Au NP excited by the laser at the surface plasmon resonance peak can generate a nanoscale bubble, which can encapsulate the NP (i.e., supercavitation) to create a virtually frictionless environment for it to move, like the Leidenfrost effect. Certain NP-in-bubble configurations can lead to the optical pulling of NP against the photon stream. The demonstrated ultra-fast, light-driven NP movement may benefit a wide range of nanoand bio-applications and provide new insights to the field of optical pulling force.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

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Ballistic supercavitating nanoparticles driven by single Gaussian beam optical pushing and pulling forces

2020

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“…In Eq. 1 , F ee and F em usually dominate in F z for most materials ( 10 ), and their signs (i.e., positive or negative) often determine the direction of the optical force. We note that for NPs with a strong magnetic dipole resonance (e.g., Si NPs), F mm can contribute to determining the sign of F z at the resonance ( 14 – 16 ), but at the off-resonance wavelength, the influence of F mm is insignificant, which will be shown later.…”

Section: Resultsmentioning

confidence: 99%

“…For instance, Guo et al (10) proposed theoretically that a single plane wave could pull a silica NP against the photon stream when the imaginary part of the electric dipole moment of the silica NP was reversed by optically coupling to a nearby Au NP that is 50 to 100 nm away. However, the two optically coupled objects (i.e., optically binding objects) can move apart (or stick together) when the opposite optical forces on them are repulsive (or attractive) (10,11), diminishing their optical coupling and thus OPF. As a result, such a strategy requires the optically coupled objects to stay close by to pull one of them for long distances, but it has not been demonstrated yet.…”

Section: Introductionmentioning

confidence: 99%

Long-distance optical pulling of nanoparticle in a low index cavity using a single plane wave

Lee

Luo

2020

Sci. Adv.

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Optical pulling force (OPF) can make a nanoparticle (NP) move against the propagation direction of the incident light. Long-distance optical pulling is highly desired for nano-object manipulation, but its realization remains challenging. We propose an NP-in-cavity structure that can be pulled by a single plane wave to travel long distances when the spherical cavity wrapping the NP has a refractive index lower than the medium. An electromagnetic multipole analysis shows that NPs made of many common materials can receive the OPF inside a lower index cavity. Using a silica-Au core-shell NP that is encapsulated by a plasmonic nanobubble, we experimentally demonstrate that a single laser can pull the Au NP-in-nanobubble structure for ~0.1 mm. These results may lead to practical applications that can use the optical pulling of NP, such as optically driven nanostructure assembly and nanoswimmers.

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An Optical Cluster: Near‐Field Optical Sorting and Separation of Plasmonic, Dielectric, and Chiral Nanoparticle

et al. 2021

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Separating distinct nanoparticles from a cluster by applying simple nonstructured light can be a novel approach for future industrial development. Understanding the type of distinct particles from a three‐particle cluster (i.e., chiral, plasmonic, and dielectric) based on different near‐field optical forces has not been reported so far. In most of the set ups, optical sorting is reported for radius‐based sorting of Mie‐ranged single object. Here, three different optical setups are proposed, illuminated by a linearly polarized plane wave (propagating along θ=45∘ angle) in a particle cluster constructed with chiral, plasmonic, and dielectric nanoparticles in an air medium (case 1), half immersed in water (case 2), and fully immersed in water (case 3). All of those have supported the near‐field optical sorting from the cluster of three Rayleigh sized particles. It is observed that the dielectric object experiences counter‐intuitive optical pulling force mainly due to the effect of induced magnetic‐type resonance created on nearby plasmonic object. In contrast, plasmonic objects experience optical pushing force due to the transferred momentum of photon and chiral objects experience lateral force mainly due to the induced magnetic dipole on the chiral object.

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Tunable optical pulling force mediated by resonant electromagnetic coupling

Cited by 21 publications

References 45 publications

Ballistic supercavitating nanoparticles driven by single Gaussian beam optical pushing and pulling forces

Ballistic supercavitating nanoparticles driven by single Gaussian beam optical pushing and pulling forces

Long-distance optical pulling of nanoparticle in a low index cavity using a single plane wave

An Optical Cluster: Near‐Field Optical Sorting and Separation of Plasmonic, Dielectric, and Chiral Nanoparticle

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