Structural Design And Analysis Of Optofluidic Lens

Optofluidics has been widely concerned and studied in optical related fields,because it can flexibly adjust the focal length,realize microfluidic analysis and optical detection at the same time in a microchip,and simplify the size of lens.Among them,the optofluidic lens with dual interface has important research significance,because the curvature of its dual interface can be adjusted independently according to the demand,accompanied by a large change of optical power.In this paper,the combined form is used to realize the optofluidic lenses based on three different driving forces: electrowetting-on-dielectric force,dielectrophoresis force and longitudinal gradient electrostatic force,and the related properties of the lenses are analyzed.The main research contents of this paper are as follows:1.In this paper,the research background of this subject and its related research progress at home and abroad are introduced.2.The working principles of the three main driving forces are introduced,and they are simply compared and analyzed from different angles.3.The designed biconvex optofluidic lens structure is simulated and analyzed by using COMSOL simulation software.The relevant factors affecting the electric field distribution of a single droplet lens structure are analyzed.Combined with ZEMAX software,the corresponding optical models are established,the focal length values and the root mean square radius values of the imaging spot diagram under different voltages are obtained.It is found that the focal length of the biconvex optofluidic lens continuously decreases from 37.2746 mm to 5.2879 mm,and the focal length changes by 31.9867 mm,about 32 mm.4.Based on the three driving forces,the structures of biconvex optofluidic lenes are designed experimentally.By applying voltage to the lens,the liquid interface surface shapes are observed and the zoom performances are analyzed.The image processing and fitting analysis of the surface shapes obtained from the experiment are carried out,and the related effects of different parameters are analyzed.It is found that the adjustment of the three driving forces on the biconvex optofluidic lens is reversible after the voltage is applied and withdrawn,and the fitting results of the surface shape in the initial state show the aspherical characteristics of the liquid interface.