Hydrodynamically reconfigurable optofluidic microlens with continuous shape tuning from biconvex to biconcave

Fang, Chaolong; Dai, Bo; Xu, Qiao; Zhuo, Ran; Wang, Qi; Wang, Xu; Zhang, Dawei

doi:10.1364/oe.25.000888

Cited by 14 publications

(9 citation statements)

References 34 publications

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“…Another application case of utilizing the Dean flow is the 3D lens. The solid microlens generally has a fixed focal length once it is fabricated, while the liquid microlens provides a greater flexibility 28 . In 2007, Mao et al proposed a 2D optofluidic cylindrical microlens by the Dean flow 29 .…”

Section: Optofluidic Chipmentioning

confidence: 99%

Optofluidics: the interaction between light and flowing liquids in integrated devices

Zhu¹,

Zhu²,

Zuo³

et al. 2019

Opto-Electronic Advances

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Optofluidics is a rising technology that combines microfluidics and optics. Its goal is to manipulate light and flowing liquids on the micro/nanoscale and exploiting their interaction in optofluidic chips. The fluid flow in the on-chip devices is reconfigurable, non-uniform and usually transports substances being analyzed, offering a new idea in the accurate manipulation of lights and biochemical samples. In this paper, we summarized the light modulation in heterogeneous media by unique fluid dynamic properties such as molecular diffusion, heat conduction, centrifugation effect, light-matter interaction and others. By understanding the novel phenomena due to the interaction of light and flowing liquids, quantities of tunable and reconfigurable optofluidic devices such as waveguides, lenses, and lasers are introduced. Those novel applications bring us firm conviction that optofluidics would provide better solutions to high-efficient and high-quality lab-on-chip systems in terms of biochemical analysis and environment monitoring.

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Section: Optofluidic Chipmentioning

confidence: 99%

Optofluidics: the interaction between light and flowing liquids in integrated devices

Zhu¹,

Zhu²,

Zuo³

et al. 2019

Opto-Electronic Advances

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“…Another way to change the geometry of the in-plane liquid lens is to use the hydrodynamic modulation [ 26 , 27 , 33 ], in which the fluidic curve is formed and controlled by hydrodynamic force. In this case, two or more immiscible streams (the liquid core and the liquid cladding) are pumped into a specific microchannel to form reconfigurable interfaces.…”

Section: Classification Of In-plane Optofluidic Lensesmentioning

confidence: 99%

“…They used the combination of pressure driven flow and electro-osmosis to realize both focusing and diverging in a rectangle chip. Fang et al proposed a hydrodynamically reconfigurable optofluidic lens, which can be tuned from biconcave to biconvex [ 27 ]. Figure 5 depicts the operation principle of the liquid lens.…”

Section: Classification Of In-plane Optofluidic Lensesmentioning

confidence: 99%

“…The focal length is usually tuned by changing the lens geometry. In a microfluidic chip, there are numerous ways to modify the curvature of the fluidic interface, for example, pressure control [ 25 ], hydrodynamic modulation [ 26 , 27 ], electrowetting [ 24 ] and dielectrophoresis [ 23 ]. Among them, the pressure control and the hydrodynamic modulation are more popular in regulating in-plane lenses.…”

Section: Introductionmentioning

confidence: 99%

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Optofluidic Tunable Lenses for In-Plane Light Manipulation

Chen

et al. 2018

Micromachines

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Optofluidics incorporates optics and microfluidics together to construct novel devices for microsystems, providing flexible reconfigurability and high compatibility. Among many novel devices, a prominent one is the in-plane optofluidic lens. It manipulates the light in the plane of the substrate, upon which the liquid sample is held. Benefiting from the compatibility, the in-plane optofluidic lenses can be incorporated into a single chip without complicated manual alignment and promises high integration density. In term of the tunability, the in-plane liquid lenses can be either tuned by adjusting the fluidic interface using numerous microfluidic techniques, or by modulating the refractive index of the liquid using temperature, electric field and concentration. In this paper, the in-plane liquid lenses will be reviewed in the aspects of operation mechanisms and recent development. In addition, their applications in lab-on-a-chip systems are also discussed.

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“…The curvature of the interface can be modified by controlling the flow rate, thereby changing its focal length. Fang et al demonstrated a hydrodynamically reconfigurable optofluidic lens using flowing streams, in which the liquid of high RI acts as the core and the other one of low RI as the cladding [25]. They demonstrated the tuning of the liquid lens from biconcave to biconvex by adjusting the flow rate.…”

Section: Introductionmentioning

confidence: 99%

Dielectrophoresis-actuated in-plane optofluidic lens with tunability of focal length from negative to positive

Chen

Zhu

et al. 2018

Opt. Express

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This paper reports a tunable in-plane optofluidic lens by continuously tuning a silicone oil-air interface from concave to convex using the dielectrophoresis (DEP) force. Two parallel glasses are bonded firmly on two sides by NOA 81(Norland Optical Adhesive 81) spacers, forming an open microfluidic channel. An ITO (indium tin oxide) strip and another unpatterned ITO layer are deposited on two glasses as the top and bottom electrodes. Initially, a capillary concave liquid-air interface is formed at the end of the open channel. Then the DEP force is enabled to continuously deform the interface (lens) from concave to convex. In the experiment, the focal length gradually decreases from about -1 mm to infinite and then from infinite to around + 1 mm when the driving voltage is increased from 0 V to 260 V. Particularly, the longitudinal spherical aberration (LSA) is effectively suppressed to have LSA < 0.04 when the lens is operated in the focusing state. This work is the first study of in-plane tunable lenses using the DEP force and possesses special merits as compared to the other reported tunable lenses that are formed by pumping different liquids or by temperature gradient, such as wide tunability, no need for continuous supply of liquids, low power consumption (~81 nJ per switching) due to the capacitor-type driving, and the use of only one type of liquid. Besides, its low aberration makes it favorable for light manipulation in microfluidic networks.

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Hydrodynamically reconfigurable optofluidic microlens with continuous shape tuning from biconvex to biconcave

Cited by 14 publications

References 34 publications

Optofluidics: the interaction between light and flowing liquids in integrated devices

Optofluidics: the interaction between light and flowing liquids in integrated devices

Optofluidic Tunable Lenses for In-Plane Light Manipulation

Dielectrophoresis-actuated in-plane optofluidic lens with tunability of focal length from negative to positive

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