Holographic Plasmonic Nanotweezers for Dynamic Trapping and Manipulation

Huft, Preston; Kolbow, Joshua D.; Thweatt, Jonathan T.; Lindquist, Nathan C.

doi:10.1021/acs.nanolett.7b04289

Cited by 63 publications

(65 citation statements)

References 50 publications

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“…The condition of dynamic tweezing, characterized by a trapped particle moving along a definite pattern, often requires elaborated optical setups. Among these techniques, literature reports works based on polarization modulation [17,22 ], structured beams [18] or double trapping beams [23] Here, we were able to achieve similar results on a common trapping setup with fixed linear polarization, simply by displacing the microscope objective by 2 μm.…”

Section: Switchable Trappingmentioning

confidence: 60%

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Two-state switchable plasmonic tweezers for dynamic manipulation of nano-objects

et al. 2020

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In this work we present a plasmonic platform capable of trapping nano-objects as small as 100 nm in two different spatial configurations. The switch between the two trapping states, localized on the tip and on the outer wall of a vertical gold nanochannel, can be activated by a variation in the focusing position of the excitation laser along the main axis of the nanotube.We show that the trapping mechanism is facilitated by both an electromagnetic and thermal action.The "inner" and "outer" trapping states are respectively characterized by a static and a dynamic behavior and their stiffness was measured by analyzing the position of the trapped specimens as a function of time. In addition, it was demonstrated that the stiffness of the static state is high enough to trap of particles as small as 40nm.These results show a simple, controllable way to generate a switchable two-state trapping regime, which could find applications as a model for the study of dynamic trapping or as mechanism for the development of nanofluidic devices.

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Section: Switchable Trappingmentioning

confidence: 60%

“…Literature reports some examples of dynamic manipulation of particle based on plasmonic nanostructures [17,18]. These approaches are mostly characterized by binary on/off configurations, where the particle can be either trapped by the nanostructure-enhanced field (on) or released in the solution (off).…”

Section: Introductionmentioning

confidence: 99%

Two-state switchable plasmonic tweezers for dynamic manipulation of nano-objects

et al. 2020

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“…Therefore, the "grip" exerted on nanomaterials by plasmonic optical tweezers or plasmonic optical trapping (POT) should be very strong [16][17][18] . Following early demonstrations, POT has undergone rapid growth, and has been used to trap various nanomaterials such as polymer beads 10,[19][20][21][22][23][24][25][26][27] , metallic nanoparticles 12,18 , quantum dots 13,28,29 , dye aggregates 30,31 , and so on. In addition to these hard nanospheres, we have demonstrated that POT is also applicable to soft materials such as flexible polymer chains homogeneously dissolved in water 32,33 .…”

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confidence: 99%

Plasmonic Manipulation of DNA using a Combination of Optical and Thermophoretic Forces: Separation of Different-Sized DNA from Mixture Solution

Tanaka

Itoh

Saitoh

et al. 2020

Sci Rep

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We demonstrate the size-dependent separation and permanent immobilization of DNA on plasmonic substrates by means of plasmonic optical tweezers. We found that a gold nanopyramidal dimer array enhanced the optical force exerted on the DNA, leading to permanent immobilization of the DNA on the plasmonic substrate. The immobilization was realized by a combination of the plasmon-enhanced optical force and the thermophoretic force induced by a photothermal effect of the plasmons. In this study, we applied this phenomenon to the separation and fixation of size-different DNA. During plasmon excitation, DNA strands of different sizes became permanently immobilized on the plasmonic substrate forming micro-rings of DNA. The diameter of the ring was larger for longer DNA (in base pairs). When we used plasmonic optical tweezers to trap DNA of two different lengths dissolved in solution (ϕx DNA (5.4 kbp) and λ-DNA (48.5 kbp), or ϕx DNA and T4 DNA (166 kbp)), the DNA were immobilized, creating a double micro-ring pattern. The DNA were optically separated and immobilized in the double ring, with the shorter sized DNA and the larger one forming the smaller and larger rings, respectively. This phenomenon can be quantitatively explained as being due to a combination of the plasmon-enhanced optical force and the thermophoretic force. Our plasmonic optical tweezers open up a new avenue for the separation and immobilization of DNA, foreshadowing the emergence of optical separation and fixation of biomolecules such as proteins and other ncuelic acids. DNA has been the main target for optical trapping and manipulation. This is very important in medical science and biological physics, and numerous studies have been carried out so far. With conventional optical tweezers simply using a focused laser beam (developed by Arthur Ashkin 1-4), it is rather difficult to optically trap DNA in aqueous solutions containing hydrated random coil structures because of their small polarizability 5. In many cases, small dielectric microspheres are connected to the head and end groups of the DNA, and a focused laser beam optically manipulates these microspheres 6-9. This technique for DNA manipulation has stimulated extensive development in DNA biophysics. Recently, a breakthrough was achieved in the research field of optical tweezers 10-15. This is based on surface plasmons localized around metallic nanostructures. The surface plasmons lead to an electric field (E) enhancement effect of the incident light which amplifies the optical force (F g , gradient force) and hence the optical trapping potential (U):

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“…Many different approaches have been explored to achieve this higher level of plasmonic nanoparticle manipulation, which rely on changing the location of plasmonic focal spots by adjusting the properties (e.g. the wavelength, polarisation and wavefront) of the incident light [28][29][30][31][32][33][34][35]. As the nanoparticle traces the trajectory of the focal spots, it moves in the microchannel while remaining trapped.…”

Section: Introductionmentioning

confidence: 99%

Nanoparticle trapping and routing on plasmonic nanorails in a microfluidic channel

Yin¹,

He²,

Green³

et al. 2020

Opt. Express

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Plasmonic nanostructures hold great promise for enabling advanced optical manipulation of nanoparticles in microfluidic channels, resulting from the generation of strong and controllable light focal points at the nanoscale. A primary remaining challenge in the current integration of plasmonics and microfluidics is to transport trapped nanoparticles along designated routes. Here we demonstrate through numerical simulation a plasmonic nanoparticle router that can trap and route a nanoparticle in a microfluidic channel with a continuous fluidic flow. The nanoparticle router contains a series of gold nanostrips on top of a continuous gold film. The nanostrips support both localised and propagating surface plasmons under light illumination, which underpin the trapping and routing functionalities. The nanoparticle guiding at a Y-branch junction is enabled by a small change of 50 nm in the wavelength of incident light.

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Holographic Plasmonic Nanotweezers for Dynamic Trapping and Manipulation

Cited by 63 publications

References 50 publications

Two-state switchable plasmonic tweezers for dynamic manipulation of nano-objects

Two-state switchable plasmonic tweezers for dynamic manipulation of nano-objects

Plasmonic Manipulation of DNA using a Combination of Optical and Thermophoretic Forces: Separation of Different-Sized DNA from Mixture Solution

Nanoparticle trapping and routing on plasmonic nanorails in a microfluidic channel

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