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Electrowetting Lens

Application ID: 10029

The contact angle of a two-fluid interface with a solid surface is determined by the balance of the forces at the contact point. In electrowetting the balance of forces at the contact point is modified by the application of a voltage between a conducting fluid and the solid surface.

In many applications the solid surface consists of a thin dielectric deposited onto a conducting layer; this is often referred to as Electrowetting on Dielectric (EWOD). Electrowetting can be used to modify the contact angle dynamically by changing the voltage applied to the conducting liquid. In this example, the meniscus between two immiscible liquids is used as an optical lens. A change in curvature of the meniscus caused by the electrowetting effect is used to change the focal length of the lens over a large range. This model is based on the work of the Philips FluidFocus team.

This model uses the Laminar Two-Phase Flow, Moving Mesh interface and a time dependent study.

This application was built using the following:

Microfluidics Module

The combination of COMSOL® products required to model your application depends on the physics interfaces that define it. Particular physics interfaces may be common to several products (see the Specification Chart for more details). To determine the right combination of products for your project, you should evaluate all of your needs in light of each product's capabilities, consultation with the COMSOL Sales and Support teams, and the use of an evaluation license.