The double-liquid focus-tunable lens based on electrowetting on dielectrics is attracting many researchers’ attention because of compact volume, quick responding speed, low consumption etc. In this paper, a focus-tunable liquid cylindrical lens based on electrowetting is designed, the structure and operating principles of this lens are introduced. COMSOL Multiphysics is chamber, and the focal length is varied continuously. According to the materials used in our laboratory, the focal length is estimated, ranging between (-∞, -38.6mm)υ(61.4mm, +∞).
The double-liquid variable-focus lens based on the electrowetting has the characteristics of small size, light weight, fast response, and low price and so on. In this paper, double-liquid variable-focus lens’s Principle and structure are introduced. The reasons for the existence and improvement of contact angle hysteresis are given according improved Young’s equation. At last, 1-Bromododecane with silicone oil are mixed to get oil liquid with different viscosity and proportion liquid as insulating liquid. External voltages are applied to these three liquid lens and focal lengths of the lenses versus applied voltage are investigated. Experiments show that, the decreasing of oil liquid viscosity can reduce focal length hysteresis.
Since electrowetting has been proposed, researchers began to apply eletrowetting into different fields, such as lab-on-chip systems, display technologies, printings and optics etc. This paper mainly introduced structure, theory and application of optical devices based on electrowetting. The optical devices include liquid optical prism, liquid optical lens and display. The paper introduced their principle, specific application and many advantages in optical applications. When they are applied to optical system, production and experiment, they can reduce mechanical moving parts, simplify the structure, operate easily, decrease manufacturing cost and energy consumption, improve working efficiency, and so on. We learn and research them in detail that will contribute to research and develop optical eletrowetting in the future.
With the miniaturization and light-weight of photoelectric instruments, the original method to change the focal length of lens mechanically can't meet the requirements now. Then variable-focus lens without mechanical elements appears. In recent years, varieties of variable-focus lenses, which have variable surfaces radius or variable refractive index, are put forward. The variable-focus lenses with variable surface radius mainly include variable-focus double liquid lens based on EWOD, variable-focus lens based on hydraulic pressure, ultrasonic variable-focus optical lens and so on. The variable-focus lens with variable refractive index mainly includes liquid crystal lens. This article introduces these kinds of variable-focus lenses and expounds the problems to be solved. It also analyzes the developing trend of variable-focus lens. KEYWORDS: variable-focus lens, EWOD, variable-focus double liquid lens, hydraulic pressure liquid lens, ultrasonic variable-focus optical lens, liquid crystal lens
Tantalum pentoxide film has a huge application potential in microelectronic field owing to its good chemical stability and thermal stability, and its good compatibility with semiconductor integrated circuit. In addition, Tantalum pentoxide film also has a high dielectric constant, a high refractive index, low absorption rate and a wide spectral range from 300nm to 1000nm in the visible spectral region. At present, it has a wide application in antireflection coatings, lasers, optical communication, solar wafers and so on. This review will focus on the preparation methods of Tantalum pentoxide film, and tantalum pentoxide film’s property and application, which are better for us to choose an appropriate method in an appropriate occasion.
In order to cure the cataract disease or injuries in eyes, intraocular lens(IOL) has been studied all the time to replace the crystalline lens in human eyes. Researches on IOL are started early from 19th century, and it develops greatly in the hundreds years after. This article introduces several main kinds of IOLs that appear in the development history of IOL, and raises the double-liquid zoom IOL based on electrowetting, which will be the trend of IOL study.
A novel design of a zoom lens system without motorized movements is proposed. The lens system consists of a fixed
lens and two double-liquid variable-focus lenses. The liquid lenses, made out of two immiscible liquids, are based on the
principle of electrowetting: an effect controlling the wetting properties of a liquid on a solid by modifying the applied
voltage at the solid-liquid interface. The structure and principle of the lens system are introduced in this paper. And
detailed calculations and simulation examples are presented to predict how two liquid lenses are related to meet the basic
requirements of zoom lenses.
In this paper, various structures for double-liquid variable focus lens are introduced. And based on an energy
minimization method, explicit calculations and detailed analyses upon an extended Young-type equation are given for
double-liquid lenses with cylindrical electrode. Such an equation is especially applicable to liquid-liquid-solid tri-phase
systems. It is a little different from the traditional Young equation that was derived according to vapor-liquid-solid triphase
systems. The electrowetting effect caused by an external voltage changes the interface shape between two liquids
as well as the focal length of the lens. Based on the extended Young-type equation, the relationship between the focal
length and the external voltage can also be derived. Corresponding equations and simulation results are presented.