Tunable optofluidic microlens through active pressure control of an air–liquid interface

Shi, Jinjie; Stratton, Zak; Lin, Szu-Yuan; Huang, Hua; Huang, Tony Jun

doi:10.1007/s10404-009-0548-9

Cited by 58 publications

(48 citation statements)

References 57 publications

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“…Due to the setup of the liquid lens ͑enclosed channel with a large adjacent reservoir͒, the evaporation of the liquid was negligible. In our experiments we were able to observe a stable light focusing for at least 4 h. Compared to our previous work on tunable microlens based on hydraulic pressure activated microbubble, 39 the current design represents a further improvement in fluid consumption as the lens does not require a constant stream of flows, and the focal position is self-sustained ͑the focal position does not change when flow injection is ceased͒, whereas in our previous work 39 the constant pumping of fluid is needed to maintain the hydraulic pressure to keep the microbubble curvature and the focal position constant.…”

Section: -4supporting

confidence: 46%

Optofluidic tunable microlens by manipulating the liquid meniscus using a flared microfluidic structure

et al. 2010

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We have designed, demonstrated, and characterized a simple, novel in-plane tunable optofluidic microlens. The microlens is realized by utilizing the interface properties between two different fluids: CaCl 2 solution and air. A constant contact angle of ϳ90°is the pivotal factor resulting in the outward bowing and convex shape of the CaCl 2 solution-air interface. The contact angle at the CaCl 2 solution-air interface is maintained by a flared structure in the polydimethylsiloxane channel. The resulting bowing interface, coupled with the refractive index difference between the two fluids, results in effective in-plane focusing. The versatility of such a design is confirmed by characterizing the intensity of a traced beam experimentally and comparing the observed focal points with those obtained via ray-tracing simulations. With the radius of curvature conveniently controlled via fluid injection, the resulting microlens has a readily tunable focal length. This ease of operation, outstandingly low fluid usage, large range tunable focal length, and in-plane focusing ability make this lens suitable for many potential lab-on-a-chip applications such as particle manipulation, flow cytometry, and in-plane optical trapping.

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Section: -4supporting

confidence: 46%

Optofluidic tunable microlens by manipulating the liquid meniscus using a flared microfluidic structure

et al. 2010

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“…Recently, the development of optofluidic lens has attracted interests from the microfluidics research community (Dino 2009;Rosenauer and Vellekoop 2009;Shi et al 2010). To enhance the optical performance, Dong and Jiang (2008) formed an in situ tunable liquid microlens using liquid-air interfaces of liquid droplets.…”

Section: Introductionmentioning

confidence: 99%

A tunable optofluidic lens based on combined effect of hydrodynamics and electroosmosis

Wong

Nguyen

2010

Microfluid Nanofluid

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This paper presents the modeling and experimental results of a liquid-core liquid-cladding optofluidic lens under the combined effect of hydrodynamics and electroosmosis. To allow the lens to be tuned by a voltage, the cladding fluids are electrically conducting, while the core fluid is non-conducting. Under constant flow rates, mathematical models of two-dimensional dipole flow in a circularly bounded domain and electric field outside the parallel-plate capacitor were used to predict the curvature of the interface. A test device with a circular lens chamber with 2 mm diameter and 250 lm height was fabricated in polymethylmethacrylate (PMMA) using thermal bounding method. Two cladding fluids (aqueous NaCl) and the core fluid (silicone oil) are introduced into the circular domain by syringe pumps. External electric fields are applied on the two cladding fluids. Under the same inlet volumetric flow rates, the applied voltages are varied to tune the curvature of the interfaces between the cladding fluids and the core fluid. The interface shape is measured using fluorescence imaging technique. The results show that the interfaces between the cladding fluids and the core fluid have optically smooth arc shape. Under fixed cladding flow rates, the same voltage forms symmetric biconvex lens only. Different voltages can form biconvex lens, planoconvex lens, and meniscus lens. The experimental results agree well with the presented analytical model.

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“…Early work included liquid microlenses based on electrowetting [38], lenses in liquid-core liquid-cladding waveguide channels [39], and tunable gradient refractive index (RI) lenses [40]. More recent examples are the demonstration of an optofluidic bi-concave lenses that allow tuning a light beam from focusing to diverging [41] and a tunable microlens that is controlled via an active pressure of an air-liquid interface [42]. A very innovative development is the demonstration of an optofluidic light splitter based on transformation optics [43].…”

Section: Reconfigurable Optofluidic Devices and Systemsmentioning

confidence: 99%

Optofluidic bioanalysis: fundamentals and applications

et al. 2017

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Over the past decade, optofluidics has established itself as a new and dynamic research field for exciting developments at the interface of photonics, microfluidics, and the life sciences. The strong desire for developing miniaturized bioanalytic devices and instruments, in particular, has led to novel and powerful approaches to integrating optical elements and biological fluids on the same chip-scale system. Here, we review the state-of-the-art in optofluidic research with emphasis on applications in bioanalysis and a focus on waveguide-based approaches that represent the most advanced level of integration between optics and fluidics. We discuss recent work in photonically reconfigurable devices and various application areas. We show how optofluidic approaches have been pushing the performance limits in bioanalysis, e.g. in terms of sensitivity and portability, satisfying many of the key requirements for point-of-care devices. This illustrates how the requirements for bianalysis instruments are increasingly being met by the symbiotic integration of novel photonic capabilities in a miniaturized system.

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Tunable optofluidic microlens through active pressure control of an air–liquid interface

Cited by 58 publications

References 57 publications

Optofluidic tunable microlens by manipulating the liquid meniscus using a flared microfluidic structure

Optofluidic tunable microlens by manipulating the liquid meniscus using a flared microfluidic structure

A tunable optofluidic lens based on combined effect of hydrodynamics and electroosmosis

Optofluidic bioanalysis: fundamentals and applications

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