Synergy between pyroelectric and photovoltaic effects for optoelectronic nanoparticle manipulation

Puerto, Andrés; Muñoz-Martín, J. F.; Méndez, Alfredo; Arizméndi, L.; Garcı́a-Cabañes, A.; Agulló‐López, F.; Carrascosa, M.

doi:10.1364/oe.27.000804

Cited by 21 publications

(26 citation statements)

References 32 publications

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“…Regarding the ferroelectric substrate, an alternative interesting manipulation method based on the thermally induced electric fields generated in undoped lithium niobate has been also proposed and extensively developed . Moreover, the synergy between both processes has been also exploited . The pyroelectric method is clearly advantageous when needing very high electric fields because pyroelectric fields can reach values significantly higher than photovoltaic ones.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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

Self Cite

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“…Regarding temperature, it should be homogeneous during the whole process (illumination and trapping). Otherwise, pyroelectric effects may appear and alter the crystal charge distribution, and so the pattern [147].…”

Section: Ambient Conditionsmentioning

confidence: 99%

“…A great variety of doping levels and oxidation-reduction ratios can be found in the samples used for conducting PVT experiments [57,68,93,128,182]. Experimentally, it has been found a minimum electric field required for trapping particles [147] and as it is known that the value of the saturation electric field is proportional to the absolute concentration of acceptors in the crystal (Eq. 5.4), it seems interesting to study the time evolution of the crystal electric field as a function of the doping and the oxidation-reduction ratio.…”

Section: Light Absorption and Crystal Thicknessmentioning

confidence: 99%

“…Two examples of this situation are the pyroelectric effect ( §10.2) [147]and the particle charging ( §8.3).…”

Section: Pattern Size and Crystal Thicknessmentioning

confidence: 99%

“…In addition, as there is evidence that suggests that there is a minimum electric field required for trapping particles [147], this FEM model is very useful for the design of experiments. It can be used to know a priori whether or not a crystal can develop an electric field high enough for particle trapping and if it does, the required value of light exposure.…”

Section: Analysis and Conclusionmentioning

confidence: 99%

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Nanoparticle structures obtained using photovoltaic tweezers and their applications in photonic devices

Martínez¹,

Francisco²

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Light‐Induced Virtual Electrodes for Microfluidic Droplet Electro‐Coalescence

Zamboni,

Sebastián‐Vicente,

Denz

et al. 2023

Adv Funct Materials

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Electro‐coalescence is the fusion phenomenon between a pair or more microfluidic droplets that are immersed in an immiscible medium under an electric field. This technique is frequently used to merge confined droplets in surfactant‐stabilized microfluidic emulsions using local electric fields. Despite the necessity of miniaturized electrodes, this method has proven highly successful in microfluidics and lab‐on‐a‐chip applications. Miniaturized electrodes severely curtail the spatial and temporal flexibility of the electric potential, thus hindering real‐time and flexible operation and leading to high production costs. The current study addresses this problem with reconfigurable electric field potential by light‐driven functional virtual electrodes. These electrodes are light‐induced on a non‐centrosymmetric ferroelectric photovoltaic crystal placed below a microfluidic droplet channel. The photovoltaic effect in the crystal is responsible for the space charge distributions that act as virtual electrodes, whose evanescent field is screened by free charges into the two liquids inside the channel. A numerical model is developed to describe the evolution of the evanescent electric field causing electro‐coalescence. Based on this prediction, two coalescence processes occur at two different timescales and with different numbers of droplets involved. Controlled exposure time modulation allows either rapid on‐demand coalescence of droplet pairs or breakup of the entire emulsion.

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Synergy between pyroelectric and photovoltaic effects for optoelectronic nanoparticle manipulation

Cited by 21 publications

References 32 publications

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

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

Nanoparticle structures obtained using photovoltaic tweezers and their applications in photonic devices

Light‐Induced Virtual Electrodes for Microfluidic Droplet Electro‐Coalescence

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