Extracting the potential-well of a near-field optical trap using the Helmholtz-Hodge decomposition

Zaman, Mohammad Asif; Padhy, Punnag; Hansen, Paul; Hesselink, Lambertus

doi:10.1063/1.5016810

Cited by 16 publications

(17 citation statements)

References 31 publications

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“…17a, b) 319,320 . Numerical simulations were used to determine the optical force and potential well of the plasmonic traps [321][322][323][324] , and a further analysis was performed with the use of dielectrophoresis 325 . Owing to the nature of near-field plasmonic traps, two-dimensional arrays of such traps can be made for complex manipulation and transport of nanoparticles.…”

Section: Homogeneous Particlesmentioning

confidence: 99%

Plasmonic tweezers: for nanoscale optical trapping and beyond

et al. 2021

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Optical tweezers and associated manipulation tools in the far field have had a major impact on scientific and engineering research by offering precise manipulation of small objects. More recently, the possibility of performing manipulation with surface plasmons has opened opportunities not feasible with conventional far-field optical methods. The use of surface plasmon techniques enables excitation of hotspots much smaller than the free-space wavelength; with this confinement, the plasmonic field facilitates trapping of various nanostructures and materials with higher precision. The successful manipulation of small particles has fostered numerous and expanding applications. In this paper, we review the principles of and developments in plasmonic tweezers techniques, including both nanostructure-assisted platforms and structureless systems. Construction methods and evaluation criteria of the techniques are presented, aiming to provide a guide for the design and optimization of the systems. The most common novel applications of plasmonic tweezers, namely, sorting and transport, sensing and imaging, and especially those in a biological context, are critically discussed. Finally, we consider the future of the development and new potential applications of this technique and discuss prospects for its impact on science.

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Section: Homogeneous Particlesmentioning

confidence: 99%

Plasmonic tweezers: for nanoscale optical trapping and beyond

et al. 2021

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“…Mainly because the trap stiffness, the trapping range (hence the traps spacing), particle's location and other characterizing parameters of an optical trap are extracted from the trapping potential. A near-field optical trap generates a force-field that can be decomposed into a conservative/irrotational component and a non-conservative/solenoidal component, using the Helmholtz-Hodge decomposition (HHD) [63]. HHD can be applied in the case of a sufficiently smooth force F, defined in a bounded domain Ω with a smooth boundary δΩ and results in the following decomposition:…”

Section: The Trapping Potential and Particle's Dynamicsmentioning

confidence: 99%

The Rise of the OM-LoC: Opto-Microfluidic Enabled Lab-on-Chip

et al. 2021

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The integration of optical circuits with microfluidic lab-on-chip (LoC) devices has resulted in a new era of potential in terms of both sample manipulation and detection at the micro-scale. On-chip optical components increase both control and analytical capabilities while reducing reliance on expensive laboratory photonic equipment that has limited microfluidic development. Notably, in-situ LoC devices for bio-chemical applications such as diagnostics and environmental monitoring could provide great value as low-cost, portable and highly sensitive systems. Multiple challenges remain however due to the complexity involved with combining photonics with micro-fabricated systems. Here, we aim to highlight the progress that optical on-chip systems have made in recent years regarding the main LoC applications: (1) sample manipulation and (2) detection. At the same time, we aim to address the constraints that limit industrial scaling of this technology. Through evaluating various fabrication methods, material choices and novel approaches of optic and fluidic integration, we aim to illustrate how optic-enabled LoC approaches are providing new possibilities for both sample analysis and manipulation.

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“…One can also estimate viscosity of the suspension medium through the ACF analysis. In terms of the corner frequency, f c , the trap stiffness κ can be written as [28,29]…”

Section: B Autocorrelation Function Analysismentioning

confidence: 99%

Trap stiffness modification of an optically trapped microsphere through directed motion of nanoparticles

et al. 2020

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We report an enhancement in the corner frequency of an optically trapped non-magnetic microsphere in the plane perpendicular to the laser propagation direction on addition of ferrofluid to the suspension medium. We conjecture that a directed motion of the nanoparticles toward the trap in this plane is responsible for the augmentation. Changes in the corner frequency in the presence of external magnetic field gradients lend credence to this conjecture. Corner frequency augmentation is also observed when zinc oxide nanoparticles are used. Here, however, no further changes are seen in the presence of magnetic field gradients.

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Extracting the potential-well of a near-field optical trap using the Helmholtz-Hodge decomposition

Cited by 16 publications

References 31 publications

Plasmonic tweezers: for nanoscale optical trapping and beyond

Plasmonic tweezers: for nanoscale optical trapping and beyond

The Rise of the OM-LoC: Opto-Microfluidic Enabled Lab-on-Chip

Trap stiffness modification of an optically trapped microsphere through directed motion of nanoparticles

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