Electrowetting-actuated multifunctional optofluidic lens to improve the quality of computer-generated holography

This paper presents an electrowetting-actuated multifunctional optofluidic (EAMO) lens to improve the quality of computer-generated holography (CGH). A unique structure of the EAMO lens based on electrowetting effect is designed. When the electrodes of the EAMO lens are applied on different voltages, the functions of focal length change and aperture change can be achieved. Then the proposed lens is used in the reproduction system of the CGH due to the multiple functions. The experimental results show that the CGH with zoom function can be realized and undesirable light can be eliminated due to the unique structure of the EAMO lens. The focal length changes can be varied from 11.6 cm to + ∞ and -∞ to −150.6 cm. The aperture size changes can be varied from 10.1 cm to 6.7 cm. By using the proposed EAMO lens, high-quality CGH can be realized without moving the position of any components mechanically, while the setup of the CGH is greatly simplified.