Fabrication and characterization of variable-focus liquid lens based on coil
Tao Chen,
Tianxin Ding,
Jingyi Sun,
Yue Chen,
Peitao Zheng,
Qirui Chen,
Zhongcheng Liang,
Meimei Kong,
Lingling Deng
Affiliations
Tao Chen
College of Electronic and Optical Engineering and College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Tianxin Ding
College of Electronic and Optical Engineering and College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Jingyi Sun
College of Electronic and Optical Engineering and College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Yue Chen
College of Electronic and Optical Engineering and College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Peitao Zheng
College of Electronic and Optical Engineering and College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Qirui Chen
College of Electronic and Optical Engineering and College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Zhongcheng Liang
College of Electronic and Optical Engineering and College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Meimei Kong
College of Electronic and Optical Engineering and College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Lingling Deng
College of Electronic and Optical Engineering and College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
This paper presents a coil-based liquid lens (CLL) with a mature and simple fabrication process. A tunable focal length is achieved by changing the liquid–liquid interface curvature using electrowetting on dielectric (EWOD). The lens cavity is a coil wound or stacked by a particular structure named EWOD wire, which is made by coating a soft insulating dielectric layer on a flexible conductive core. As a result, requirements for different lens designs can be achieved, and coating an insulating dielectric layer in complex cavities is not required. The optical performance of the CLL is measured with a clear aperture of 8 mm, which shows that the tunable range for the focal length is (−∞, −35 mm] ∪ [78 mm, +∞) at a voltage of 0–235 V, and the response time is less than 40 ms.
