Plasmonic Enhancement in the Fluorescence of Organic and Biological Molecules by Photovoltaic Tweezing Assembly

Elvira, Iris; Muñoz-Martínez, Juan F.; Jubera, Mariano; Garcı́a-Cabañes, A.; Bella, José L.; Haro‐González, P.; Díaz-García, María A.; Agulló‐López, F.; Carrascosa, M.

doi:10.1002/admt.201700024

Cited by 15 publications

(15 citation statements)

References 40 publications

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“…The technique has been also applied to fabricate grating devices on lithium niobate waveguides [39]. Another relevant result that considerably enhances the applicability of particle patterns fabricated by PVT is the possibility of transferring the patterns to other substrates (glass, organic films) as it has been recently reported [36,38,39]. The result of such transferring method is illustrated in Figure 6c,d that shows the initial pattern on the lithium niobate substrate (Figure 6c) and the transferred pattern to a glass substrate (Figure 6d).…”

Section: Manipulation Of Micro-or Nanoparticles and Applicationsmentioning

confidence: 97%

“…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%

“…On the one hand, fabrication of metal nanoparticle structures has been demonstrated and applied for plasmonic fluorescence (FL) enhancement from organic luminescent molecules [36,37]. In fact, a remarkable average enhancement factor of 10 is observed for disperse Red 1 organic molecules deposited on the 1D and 2D metallic patterns fabricated in a x-or z-cut substrate, respectively.…”

Section: Manipulation Of Micro-or Nanoparticles and Applicationsmentioning

confidence: 99%

“…Finally, the possibility to combine PVT with other optical effects in biotechnological applications has been very recently reported [36]. There, the plasmonic enhancement of organic molecule fluorescence was efficiently modulated by PVT-driven patterns of silver nanoparticles.…”

Section: Biological Pvt Applicationsmentioning

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: Manipulation Of Micro-or Nanoparticles and Applicationsmentioning

confidence: 97%

Section: Manipulation Of Micro-or Nanoparticles and Applicationsmentioning

confidence: 99%

Section: Manipulation Of Micro-or Nanoparticles and Applicationsmentioning

confidence: 99%

Section: Biological Pvt Applicationsmentioning

confidence: 99%

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Recent Achievements on Photovoltaic Optoelectronic Tweezers Based on Lithium Niobate

et al. 2018

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“…This property makes PVOT very well suited to produce micro‐ and nanoparticle stable patterns. In fact, the fabrication of patterns with a very large number of metallic or dielectric particles distributed over a relatively large area, more than 1000 × 1000 µm has been already reported and a variety of applications in different fields, such as photonics, nanotechnology, biotechnology, and optofluidics, have been recently proposed and tested. PVOT manipulation involves not only the electrical response of the particles but also the singular optoelectronic behavior of the ferroelectric substrate .…”

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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Light and Thermally Induced Charge Transfer and Ejection of Micro‐/Nanoparticles from Ferroelectric Crystal Surfaces

Sebastián‐Vicente

Garcı́a-Cabañes

Agulló‐López

et al. 2021

Adv Elect Materials

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pyroelectric (PY) effect, allowing handling and trapping particles being close to the ferroelectric platform. Numerous works have been reported on these techniques and their multiple applications. Some reviews or reference works are refs. [12,15,16] for photovoltaic optoelectronic tweezers (PVOT), and refs. [10,17,18] for PY trapping.The particle ejection phenomenon reported in this paper has been incidentally discovered during particle manipulation with PVOT. [19] The so-called PVOT are a rather recent technique that has undergone a rapid development in the last few years, [16] based on the electric fields generated by the bulk PV effect. This effect is a singular phenomenon which strongly appears in a few crystalline ferroelectric materials, [20,21] such as LiNbO 3 (LN), when properly doped (mainly Fe or Cu). It allows the generation of remarkably high electric fields (up to ≈1.5 × 10 5 V cm −1 ) [22] for moderate or low light excitation levels (around mW cm −2 ). The PV effect is associated with optical transitions from localized states of impurities, such as Fe 2+ /Fe 3+ or Cu + /Cu 2+ , and with a directional electron migration along the polar axis (PV current). Once displaced, the electrons are trapped in other defects and generate a spatial charge distribution and the corresponding electric field, [23] which are illustrated in Figure 1. Two crystal configurations (parallel and perpendicular), commonly used for particle manipulation, are shown. [24,25] They are defined by the orientation of the polar axis, parallel or perpendicular to the active surface, respectively. The PV electric field extends near the surface outside the crystal (evanescent PV fields), where it can act either on charged particles via electrophoretic forces, or on neutral objects polarized by the field via dielectrophoretic forces, [26,27] as illustrated in Figure 1.So far, the vast majority of the reported experimental results have been obtained by using a two-step sequential procedure: first, the PV substrate is illuminated, and then, the particles are manipulated and trapped by means of the light-induced PV electric fields. This sequential method can be employed because the PV fields remain after illumination for periods of time in the range of days to months unless they are thermally erased or externally screened. Although this method is quite convenient to trap particles and assemble permanent particle structures, other applications require real-time manipulation.During real-time operation of photovoltaic optoelectronic tweezers, a novel intriguing phenomenon has been recently observed, namely, silver nanoparticles previously deposited on ferroelectric LiNbO 3 :Fe surfaces are ejected from them by illumination. Here, it is shown that this phenomenon results from the electrical charging of the micro-/nanoparticles previously trapped on the LiNbO 3 :Fe surfaces and the subsequent Coulomb repulsion. Specific experiments are performed to determine the sign of the transferred charges, which is negative/positive for the +c/−c sample face...

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Plasmonic Enhancement in the Fluorescence of Organic and Biological Molecules by Photovoltaic Tweezing Assembly

Abstract: Figure 8. SEM image of the Ag nanoparticles (average particle size of 25 nm) used for PV trapping. www.advancedsciencenews.com

Cited by 15 publications

References 40 publications

Recent Achievements on Photovoltaic Optoelectronic Tweezers Based on Lithium Niobate

Recent Achievements on Photovoltaic Optoelectronic Tweezers Based on Lithium Niobate

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

Light and Thermally Induced Charge Transfer and Ejection of Micro‐/Nanoparticles from Ferroelectric Crystal Surfaces

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