Controlling ghost traps in holographic optical tweezers

Hesseling, Christina; Woerdemann, Mike; Hermerschmidt, Andreas; Denz, Cornélia

doi:10.1364/ol.36.003657

Cited by 26 publications

(14 citation statements)

References 8 publications

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“…The appearance of artifacts and ghost traps is a very pressing problem in HOT (51); this problem also appears in our HAT system. On the one hand, secondary nodes appear along the z axis.…”

Section: Discussionmentioning

confidence: 99%

Holographic acoustic tweezers

Marzo

Drinkwater

2018

Proc. Natl. Acad. Sci. U.S.A.

401

261

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SignificanceHolographic optical tweezers use focused light to manipulate multiple objects independently without contact. They are used in tasks such as measuring the spring constant of DNA, the pulling force of the kinesin protein, or to trap matter in exotic states. Differently, acoustic tweezers use sound radiation forces to trap particles at a larger scale (i.e., from micrometers to centimeters). However, previous implementations did not provide individual control. We present the realization of holographic acoustic tweezers. Using an array of sound emitters, we engineer the generated sound field to manipulate multiple particles individually. This enables applications in contactless assembly both at the micrometer and centimeter scale as well as the creation of displays in which the pixels are levitating particles.

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“…The appearance of artifacts and ghost traps is a very pressing problem in HOT (51); this problem also appears in our HAT system. On the one hand, secondary nodes appear along the z axis.…”

Section: Discussionmentioning

confidence: 99%

Holographic acoustic tweezers

Marzo

Drinkwater

2018

Proc. Natl. Acad. Sci. U.S.A.

401

261

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“…These kind of algorithms propagate the light field numerically (using Fourier transformations) between the focal plane where the optical tweezers are supposed to appear and the hologram plane. In each plane the individual constraints, such as the trapping light pattern, the shape of the illumination beam, possible pixelation, discretisation of the phase levels, but also desired homogeneity of the traps or suppression of ghost traps can be accounted for .…”

Section: Beyond Standard Optical Tweezersmentioning

confidence: 99%

Advanced optical trapping by complex beam shaping

Woerdemann

Alpmann

Esseling

et al. 2013

Laser & Photonics Reviews

Self Cite

375

210

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Optical tweezers, a simple and robust implementation of optical micromanipulation technologies, have become a standard tool in biological, medical and physics research laboratories. Recently, with the utilization of holographic beam shaping techniques, more sophisticated trapping configurations have been realized to overcome current challenges in applications. Holographically generated higher‐order light modes, for example, can induce highly structured and ordered three‐dimensional optical potential landscapes with promising applications in optically guided assembly, transfer of orbital angular momentum, or acceleration of particles along defined trajectories. The non‐diffracting property of particular light modes enables the optical manipulation in multiple planes or the creation of axially extended particle structures. Alongside with these concepts which rely on direct interaction of the light field with particles, two promising adjacent approaches tackle fundamental limitations by utilizing non‐optical forces which are, however, induced by optical light fields. Optoelectronic tweezers take advantage of dielectrophoretic forces for adaptive and flexible, massively parallel trapping. Photophoretic trapping makes use of thermal forces and by this means is perfectly suited for trapping absorbing particles. Hence the possibility to tailor light fields holographically, combined with the complementary dielectrophoretic and photophoretic trapping provides a holistic approach to the majority of optical micromanipulation scenarios.

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“…The impact of these phase errors can be dramatic, especially in high-resolution metasurfaces, leading to significant reduction in the efficiency and to the formation of ghost images [92]. Ghost images are essentially the complex conjugated images of the desired object beam.…”

Section: Pixel Realizationmentioning

confidence: 99%

Metasurfaces-based holography and beam shaping: engineering the phase profile of light

Scheuer

2016

Nanophotonics

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Abstract:The ability to engineer and shape the phase profile of optical beams is in the heart of any optical element. Be it a simple lens or a sophisticated holographic element, the functionality of such components is dictated by their spatial phase response. In contrast to conventional optical components which rely on thickness variation to induce a phase profile, metasurfaces facilitate the realization of arbitrary phase distributions using large arrays with subwavelength and ultrathin (tens of nanometers) features. Such components can be easily realized using a single lithographic step and is highly suited for patterning a variety of substrates, including nonplanar and soft surfaces. In this article, we review the recent developments, potential, and opportunities of metasurfaces applications. We focus primarily on flat optical devices, holography, and beam-shaping applications as these are the key ingredients needed for the development of a new generation of optical devices which could find widespread applications in photonics.

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Controlling ghost traps in holographic optical tweezers

Cited by 26 publications

References 8 publications

Holographic acoustic tweezers

Holographic acoustic tweezers

Advanced optical trapping by complex beam shaping

Metasurfaces-based holography and beam shaping: engineering the phase profile of light

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