Massive ordering and alignment of cylindrical micro-objects by photovoltaic optoelectronic tweezers

Elvira, Iris; Muñoz-Martínez, Juan F.; Barroso, Álvaro; Denz, Cornélia; Ramiro, José Bruno; Garcı́a-Cabañes, A.; Agulló‐López, F.; Carrascosa, M.

doi:10.1364/ol.43.000030

Cited by 28 publications

(30 citation statements)

References 26 publications

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“…However, recently, new results have been reported on the effect of the electrical torques acting on elongated particles and the possibility of inducing, not only their trapping, but also their alignment along the PV fields [21,31]. For anisotropic particles the tensor αij has, in principle, three different principal values along the three main perpendicular axes.…”

Section: Physical Basis Of the Pv Methodsmentioning

confidence: 99%

“…For anisotropic particles the tensor α ij has, in principle, three different principal values along the three main perpendicular axes. For elongated (rod-shaped) particles having a dominant long z dimension (as for zeolite micro-cylinders in reference [31]), the main α zz component is:…”

Section: Physical Basis Of the Pv Methodsmentioning

confidence: 99%

“…Note that this torque operates throughout the whole trajectory of the particle path tending to align its main axis with the field during its approach to the active crystal surface. In reference [31] a rough simple estimate of the photovoltaic torque acting on elongated zeolites, ignoring local field effects, is calculated. For a typical PV field, E = 10 6 V/m, the maximum PV electrical torque value is τ ≈ 10 −15 Nm.…”

Section: Physical Basis Of the Pv Methodsmentioning

confidence: 99%

“…The combined action of patterning and alignment is demonstrated. This new capability enhances the versatility of PVT that are becoming a unique tool to prepare functional microstructures useful in a variety of fields such as photonics (nonlinear optics, plasmonics [36]), nanochemistry [31] or microfluidics [40].…”

Section: Manipulation Of Micro-or Nanoparticles and Applicationsmentioning

confidence: 99%

“…An organic liquid containing droplets of another immiscible liquid was injected and pumped through the channels. The lithium niobate Finally, a work on the use of PVT for alignment of a large number of micro-cylinders (zeolites type L), either parallel or normal to the substrate surface, has been recently published [31]. The combined action of patterning and alignment is demonstrated.…”

Section: Droplet Manipulationmentioning

confidence: 99%

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Recent Achievements on Photovoltaic Optoelectronic Tweezers Based on Lithium Niobate

et al. 2018

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Abstract:This review presents an up-dated summary of the fundamentals and applications of optoelectronic photovoltaic tweezers for trapping and manipulation of nano-objects on the surface of lithium niobate crystals. It extends the contents of previous reviews to cover new topics and developments which have emerged in recent years and are marking the trends for future research. Regarding the theoretical description of photovoltaic tweezers, detailed simulations of the electrophoretic and dielectrophoretic forces acting on different crystal configurations are discussed in relation to the structure of the obtained trapping patterns. As for the experimental work, we will pay attention to the manipulation and patterning of micro-and nanoparticles that has experimented an outstanding progress and relevant applications have been reported. An additional focus is now laid on recent work about micro-droplets, which is a central topic in microfluidics and optofluidics. New developments in biology and biomedicine also constitute a relevant part of the review. Finally, some topics partially related with photovoltaic tweezers and a discussion on future prospects and challenges are included.

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Section: Physical Basis Of the Pv Methodsmentioning

confidence: 99%

Section: Physical Basis Of the Pv Methodsmentioning

confidence: 99%

Section: Physical Basis Of the Pv Methodsmentioning

confidence: 99%

Section: Manipulation Of Micro-or Nanoparticles and Applicationsmentioning

confidence: 99%

Section: Droplet Manipulationmentioning

confidence: 99%

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Recent Achievements on Photovoltaic Optoelectronic Tweezers Based on Lithium Niobate

et al. 2018

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Assembly of Topographical Micropatterns with Optoelectronic Tweezers

Zhang

Zhai

Peng

et al. 2019

Advanced Optical Materials

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sequestration. [5][6][7] There are three categories of techniques that have been used to manufacture TMPs; the first (canonical) category relies on photo-or electron-beam (e-beam) lithography and etching. These methods permit unparalleled flexibility in user determination of feature size and spatial positioning, but they are expensive, require a cleanroom (and are not accessible to all users), and have some limitations on throughput (particularly for e-beam lithography). In recognition of these limitations, a second category of "dry" cleanroom-free methods has been developed, including 3D printing, [8][9][10] laser machining, [11] and "pick-and-place" technologies. [12,13] These techniques are useful, but they also rely on expensive and specialized tools and well-trained personnel, and can have limited throughput.A third category of "wet" cleanroom-free techniques has recently been proposed for forming topographical micropatterns, relying on dielectrophoresis tweezers (DEPT), [14][15][16] acoustic tweezers (AT), [17][18][19] magnetic tweezers (MT), [20,21] and optical tweezers (OT). [22][23][24][25] These techniques, in which patterns of 3D particles are assembled in a fluidic environment and are later dried for use in TMP applications, are creative and interesting, and preserve many of the advantages of the canonical methods while allowing for accessible, cleanroom-free operation. But each of the individual techniques has disadvantages; for example, DEPT and AT require the manufacture of micropatterned electrodes (typically using canonical cleanroom methods) and lack the flexibility to pattern large numbers of features. Likewise, MT-based methods can only assemble micro-objects that respond to magnetic fields, and OT-based techniques have sub-nanoNewton (

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Real‐Time Operation of Photovoltaic Optoelectronic Tweezers: New Strategies for Massive Nano‐object Manipulation and Reconfigurable Patterning

Sebastián‐Vicente

Muñoz‐Cortés

Garcı́a-Cabañes

et al. 2019

Part & Part Syst Charact

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Optical and optoelectronic techniques for micro‐ and nano‐object manipulation are becoming essential tools in nano‐ and biotechnology. Among optoelectronic manipulation platforms, photovoltaic optoelectronic tweezers (PVOTs) are an emergent technique that are particularly successful at producing permanent nanoparticle microstructures. New strategies to enhance the capabilities of PVOT, based on real‐time operation, are investigated. This optoelectronic platform uses z‐cut LiNbO3:Fe substrates under excitation by a Gaussian light beam. Unexpected results show that during illumination, metallic particles previously deposited on the substrate are ejected from the light spot region. This behavior differs from the trapping phenomenon observed in previous work on PVOT operation, using a sequential method in which illumination is prior to particle manipulation. To discuss the results, a novel mechanism of charge exchange between particles and the ferroelectric substrate is proposed. Applications of this repulsion behavior are investigated. On the one hand, either particle repulsion or trapping in the illuminated region can be obtained by simply light switching on/off. On the other hand, by moving the light spot, different kinds of arbitrarily shaped tracks along the light path, either empty or filled with particles, are obtained. The results demonstrate new key capabilities of PVOT, such as pattern drawing, erasure, and reconfiguration.

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Massive ordering and alignment of cylindrical micro-objects by photovoltaic optoelectronic tweezers

Cited by 28 publications

References 26 publications

Recent Achievements on Photovoltaic Optoelectronic Tweezers Based on Lithium Niobate

Recent Achievements on Photovoltaic Optoelectronic Tweezers Based on Lithium Niobate

Assembly of Topographical Micropatterns with Optoelectronic Tweezers

Real‐Time Operation of Photovoltaic Optoelectronic Tweezers: New Strategies for Massive Nano‐object Manipulation and Reconfigurable Patterning

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