Liquid lens based on electrowetting: actual developments on larger aperture and multiple electrodes design for image stabilization or beam steering

Berge, B.; Broutin, Jérôme; Gaton, Hilario; Malet, Géraldine; Simon, E.; Thieblemont, Florent

doi:10.1117/12.2006847

Cited by 3 publications

(9 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The average values of the RMS deviation ranged from 88.98 nm at 0 V to 217.49 nm at 20 V. This result is comparable to previously reported values for RMS wavefront errors in electrowetting lens systems of 80 nm [7] and 211 nm [25] and in elastomeric lenses of 400 nm [27]. Berge et al report wavefront error values of the similarly sized, commercially available Varioptic lens A316 of 30-90 nm over the full tuning range, disregarding tilt and focus Zernike modes [28].…”

Section: Lens Qualitysupporting

confidence: 89%

Focus-tunable low-power electrowetting lenses with thin parylene films

et al. 2015

View full text Add to dashboard Cite

Electrowetting lenses with record low power consumption (microwatts) have been demonstrated using high-quality parylene AF-4 dielectric layers and large dodecyl sulfate ions. Water and propylene glycol are interchanged as the polar liquid to enable diverging and converging lens operation achievable with the application of 15 V. The optical quality of the lenses is comparable to conventional microlenses and the tuning exhibits very little (<0.5°) contact angle hysteresis.

show abstract

Section: Lens Qualitysupporting

confidence: 89%

Focus-tunable low-power electrowetting lenses with thin parylene films

et al. 2015

View full text Add to dashboard Cite

show abstract

“…To optimize the response of EWOD devices, it is imperative to study the dynamics of the liquid motion upon actuation. This dynamic behavior of EWOD actuation has been studied for droplet spreading, − capillary rise, , and lenses, − with particular emphasis on numerical modeling along with understanding the material properties and dimensional dependence of the actuation dynamics. For example, Hong et al investigated the effect of the droplet size and viscosity on the droplet spreading dynamics under direct current (DC) voltage actuation.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, by increasing the viscosity of the droplet, the response time can be tuned from underdamped to overdamped. Alternatively, for EWOD systems with viscous fluids, an overdrive voltage technique has been demonstrated to enhance the response in droplet spreading, capillary rise, and lenses . Kuiper and Hedriks, in their study, have reported systems with both underdamped and overdamped characteristics and, on the basis of a damped spring-mass system model, derived dimensionless parameters to calculate the necessary liquid viscosity for a given lens dimension for critically damped lens operation.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Response Time of Electrowetting Lenses with Shaped Input Voltage Functions

2017

View full text Add to dashboard Cite

Adaptive optical lenses based on the electrowetting principle are being rapidly implemented in many applications, such as microscopy, remote sensing, displays, and optical communication. To characterize the response of these electrowetting lenses, the dependence upon direct current (DC) driving voltage functions was investigated in a low-viscosity liquid system. Cylindrical lenses with inner diameters of 2.45 and 3.95 mm were used to characterize the dynamic behavior of the liquids under DC voltage electrowetting actuation. With the increase of the rise time of the input exponential driving voltage, the originally underdamped system response can be damped, enabling a smooth response from the lens. We experimentally determined the optimal rise times for the fastest response from the lenses. We have also performed numerical simulations of the lens actuation with input exponential driving voltage to understand the variation in the dynamics of the liquid-liquid interface with various input rise times. We further enhanced the response time of the devices by shaping the input voltage function with multiple exponential rise times. For the 3.95 mm inner diameter lens, we achieved a response time improvement of 29% when compared to the fastest response obtained using single-exponential driving voltage. The technique shows great promise for applications that require fast response times.

show abstract

“…[4] This model relies on "ideal" conditions where the friction phenomena are neglected. In his paper, Berge effectively established that some friction occurs and the damping measured is higher than the damping predicted for an ideal liquid lens.…”

Section: Resultsmentioning

confidence: 99%

“…As exposed in B. Berge's paper, [4] the classical response of a liquid lens to a step command is a second order oscillator. We will consider the damping constant ε of this oscillator.…”

Section: Optimization Of the Command Lawmentioning

confidence: 99%

Improvement of Varioptic's liquid lens based on electrowetting: how to obtain a short response time and its application in the design of a high resolution iris biometric system

et al. 2015

View full text Add to dashboard Cite

a Varioptic, a Business Unit of Parrot S.A., 24 B rue Jean Baldassini, 69007 Lyon (France); b Département d'optique théorique et appliquée, Unité haute résolution angulaire, ONERA, 29 AvABSTRACT This communication presents the results obtained for decreasing the response time of electrowetting-based real time focus correctors (liquid lenses).In order to provide a compact iris biometric system demonstrator, we have achieved a response time at 90% of 7.5 ms for a change in focalization from 0 diopter to 10 diopter with a liquid lens having an aperture of 1.9 mm. We have used a hydrodynamic fluid reorganization model to predict the features of these fast liquid lenses and evaluated the sensivity of the response time to the different conception parameters.

show abstract

Liquid lens based on electrowetting: actual developments on larger aperture and multiple electrodes design for image stabilization or beam steering

Cited by 3 publications

References 0 publications

Focus-tunable low-power electrowetting lenses with thin parylene films

Focus-tunable low-power electrowetting lenses with thin parylene films

Enhanced Response Time of Electrowetting Lenses with Shaped Input Voltage Functions

Improvement of Varioptic's liquid lens based on electrowetting: how to obtain a short response time and its application in the design of a high resolution iris biometric system

Contact Info

Product

Resources

About