We introduce a strategy to generate uniform illumination. The droplet pinned by a hydrophilic/superhydrophobic heterogeneous surface is oscillated, driven by a laterally placed loudspeaker. The vibrated droplet can be considered as a tunable lens, whose focus and focus length can be real-time tuned. The tunable “lens” is presented as a device for uniform illumination by mechanical manipulation. The incident light is scattered by the vibrated droplet during oscillation, and the irradiance distribution on the image plane becomes larger and more homogenous when the droplet is at resonance.
© 2013 Optical Society of America
Optical Design and Fabrication
Original Manuscript: May 13, 2013
Revised Manuscript: June 19, 2013
Manuscript Accepted: June 20, 2013
Published: July 23, 2013
Shuya Zhu, Weitao Jiang, Hongzhong Liu, Lei Yin, Yongsheng Shi, Bangdao Chen, Yucheng Ding, and Ningli An, "Bioinspired uniform illumination by vibrated sessile droplet pinned by a hydrophilic/superhydrophobic heterogeneous surface," Opt. Lett. 38, 2720-2722 (2013)