Title :
Spherically Encapsulated Variable Liquid Lens on Coplanar Electrodes
Author :
An, Jae Yong ; Hur, Ji Hwan ; Kim, Sohee ; Lee, Jong Hyun
Author_Institution :
Sch. of Mechatron., Gwangju Inst. of Sci. & Technol. (GIST), Gwangju, South Korea
Abstract :
We herein demonstrated an electrowetting liquid lens using a spherical polymeric encapsulation on coplanar electrodes. In order to vary the focal length, the conductive inner lens was actuated by applying a voltage to the pinwheel-shaped coplanar electrodes. Silicone oil with a low vapor pressure was used as a nonconductive outer liquid lens, which was spherically encapsulated by chemical vapor deposition of thin-film polymer. The use of polymeric (parylene) encapsulation with coplanar indium-tin-oxide (ITO) electrodes provides a unique advantage in achieving an improved transparency, a wafer-level packaging of the liquid lens and the convenient accessibility of the electrical signal.
Keywords :
chemical vapour deposition; electrodes; electronics packaging; encapsulation; indium compounds; lenses; optical films; optical polymers; polymer films; silicones; tin compounds; transparency; vapour pressure; wetting; ITO; chemical vapor deposition; conductive inner lens; coplanar indium-tin oxide electrodes; electrical signal; electrowetting liquid lens; focal length; nonconductive outer liquid lens; pinwheel-shaped coplanar electrodes; polymeric parylene; silicone oil; spherical polymeric encapsulation; spherically encapsulated variable liquid lens; thin-film polymer; transparency; vapor pressure; wafer-level packaging; Electrodes; Encapsulation; Lenses; Optical device fabrication; Polymers; Shape; Tuning; Electrooptic devices; lenses; micro fabrication; optical device fabrication;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2011.2167606
