Pulsed laser manipulation of an optically trapped bead: Averaging thermal noise and measuring the pulsed force amplitude

Lindballe, Thue B.; Kristensen, Martin; Berg-Sørensen, Kirstine; Keiding, Søren Rud; Stapelfeldt, Henrik

doi:10.1364/oe.21.001986

Cited by 8 publications

(7 citation statements)

References 30 publications

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“…Inspired by this deduction, researchers have utilized pulsed lasers to eject particles initially attached on a glass substrate, which could then be captured and levitated by a conventional CW light optical tweezer after detachment [241,242] . In corresponding works, the axial gradient force of the pulsed laser would “kick” the attached particle in a pulsed fashion, and the detachment would not occur until the transient kick surmounts the strength of van der Waals force, which is estimated to be at nanonewton level in experimental scenarios (the situation here differs from those where actuators locomote “along” the substrate surface and experience stronger adhesive forces at ∼μN scale) [242,243] . Considering the transparency of both the particles and substrate to incident light and also the fact that such a large force is beyond reach of a CW light optical tweezer with ∼mW power output, the axial optical force (which also includes the scattering force) of the pulsed laser, the peak power of which is at ∼W scale, becomes the sole reason for particle ejection.…”

Section: Optical Manipulation In Solid Environmentsmentioning

confidence: 99%

Optical manipulation: from fluid to solid domains

et al. 2023

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.Light carries energy and momentum, laying the physical foundation of optical manipulation that has facilitated advances in myriad scientific disciplines, ranging from biochemistry and robotics to quantum physics. Utilizing the momentum of light, optical tweezers have exemplified elegant light–matter interactions in which mechanical and optical momenta can be interchanged, whose effects are the most pronounced on micro and nano objects in fluid suspensions. In solid domains, the same momentum transfer becomes futile in the face of dramatically increased adhesion force. Effective implementation of optical manipulation should thereupon switch to the “energy” channel by involving auxiliary physical fields, which also coincides with the irresistible trend of enriching actuation mechanisms beyond sole reliance on light-momentum-based optical force. From this perspective, this review covers the developments of optical manipulation in schemes of both momentum and energy transfer, and we have correspondingly selected representative techniques to present. Theoretical analyses are provided at the beginning of this review followed by experimental embodiments, with special emphasis on the contrast between mechanisms and the practical realization of optical manipulation in fluid and solid domains.

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Section: Optical Manipulation In Solid Environmentsmentioning

confidence: 99%

Optical manipulation: from fluid to solid domains

et al. 2023

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“…When targeting the modulation and delivery modules, correctly under filling microscope objectives with laser illumination can be used to optimize the available power [60]. Reaching the nanonewton (nN) optical force domain can either be done in the particle module using antireflection-coated beads [61], or in the source module by just using regular beads but replacing the light source with a short-pulsed laser [62]. Moreover, by moving beyond the standard microspheres, microfabrication-tailored particle shapes can be used to create optically steered microtools [63], which we will discuss further in Section 4.…”

Section: Experimental Geometries and Strategiesmentioning

confidence: 99%

Engineering light-matter interaction for emerging optical manipulation applications

et al. 2014

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Abstract:In this review, we explore recent trends in optical micromanipulation by engineering light-matter interaction and controlling the mechanical effects of optical fields. One central theme is exploring the rich phenomena beyond the now established precision measurements based on trapping micro beads with tightly focused beams. Novel synthesized beams, exploiting the linear and angular momentum of light, open new possibilities in optical trapping and micromanipulation. Similarly, novel structures are promising to enable new optical micromanipulation modalities. Moreover, an overview of the amazing features of the optics of tractor beams and backward-directed energy fluxes will be presented. Recently the so-called effect of negative propagation of the beams (existence of the backward energy fluxes) has been confirmed for X-waves and Airy beams. In the review, we will also discuss the negative pulling force of structured beams and negative energy fluxes in the vicinity of fibers. The effect is achieved due to the interaction of multipoles or, in another interpretation, the momentum conservation. Both backward-directed Poynting vector and backward optical forces are counter-intuitive and give an insight into new physics and technologies. Exploiting the degrees of freedom in synthesizing novel beams and designed microstructures offer attractive prospects for emerging optical manipulation applications.

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“…Hence, similar to the argumentation given in Ref. 19, we derived an expression for the expectation value of the power spectral density (see supplementary material 25 )…”

mentioning

confidence: 92%

“…The switching process (on/off) is controlled by blocking the laser output in intervals with a chopper wheel. By applying a post-elimination technique 19,20 for thermal noise based on a lock-in strategy, a force sensitivity of 2.4 fN is obtained. This value is lower than the force sensitivity obtained before in the context of optical tweezers applications in liquids.…”

mentioning

confidence: 99%

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Pushing nanoparticles with light — A femtonewton resolved measurement of optical scattering forces

et al. 2016

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Optomechanical manipulation of plasmonic nanoparticles is an area of current interest, both fundamental and applied. However, no experimental method is available to determine the forward-directed scattering force that dominates for incident light of a wavelength close to the plasmon resonance. Here, we demonstrate how the scattering force acting on a single gold nanoparticle in solution can be measured. An optically trapped 80 nm particle was repetitively pushed from the side with laser light resonant to the particle plasmon frequency. A lock-in analysis of the particle movement provides a measured value for the scattering force. We obtain a resolution of less than 3 femtonewtons which is an order of magnitude smaller than any measurement of switchable forces performed on nanoparticles in solution with single beam optical tweezers to date. We compared the results of the force measurement with Mie simulations of the optical scattering force on a gold nanoparticle and found good agreement between experiment and theory within a few fN.

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Pulsed laser manipulation of an optically trapped bead: Averaging thermal noise and measuring the pulsed force amplitude

Cited by 8 publications

References 30 publications

Optical manipulation: from fluid to solid domains

Optical manipulation: from fluid to solid domains

Engineering light-matter interaction for emerging optical manipulation applications

Pushing nanoparticles with light — A femtonewton resolved measurement of optical scattering forces

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