We report a focal-length tunable liquid lens based on thermopneumatically driven fluidic pressure. The fluidic pressure is generated by deformation of an elastomeric diaphragm induced by thermopneumaticity from a laterally integrated microheater sealed within an air chamber. The pressure is transmitted by a confined liquid to a lens diaphragm through an internal fluid channel. The liquid filling under the lens diaphragm functions as a liquid lens for dynamic focusing with properties depending on the curvature of the deformed diaphragm. The diaphragm area of the air chamber is designed five times larger than that of the lens cavity to yield high focal-length tunability by amplified deflection of the lens diaphragm. With our method, we achieved excellent focal-length tunability from infinity (without an input current) to 4 mm (with an input current of 12 mA) with a lens aperture diameter of 2 mm.
© 2012 Optical Society of Korea
Original Manuscript: December 28, 2011
Revised Manuscript: February 3, 2012
Manuscript Accepted: February 14, 2012
Published: March 25, 2012
June-Kyoo Lee, Kyung-Woo Park, Geun-Bae Lim, Hak-Rin Kim, and Seong-Ho Kong, "Variable-focus Liquid Lens Based on a Laterally-integrated Thermopneumatic Actuator," J. Opt. Soc. Korea 16, 22-28 (2012)
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