Oscillating Microlens Arrays Driven by Sound Waves

6 Oscillating Microlens Arrays Driven by Sound Waves 

Time series of pinned contact oscillating liquid lens driven by external pressure at resonance but with different forcing amplitudes. Driving amplitudes are 5.5 Pa (a), 23.4 Pa (b), and 31.7 Pa (c), respectively. Liquid volume is where R is lens radius. Lens is driven at 49 Hz. Time between frames is 4 msec. Scale bar is 1 mm. (Source Lopez, C.A. and A.H. Hirsa. 2008. Nature Photonics, 2(10), 610-613. With permission.) 

The liquid-to-solid contact lines were pinned by a hydrophobic substrate this significantly reduced energy dissipation from movements of the contact lines and viscosity. The natural frequency of the system scaled with the radius of the lens as and the resulting very high frequency response was obtained with a modestly sized lens [41]. 

Ahn and Y. K. Kim, Proposal of human eye s crystalline lens-like variable focusing lens, Sensors and Actuators A - Physical, vol. 78, pp. 48-53, Nov 1999. 

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