Non-Destructive Testing on Optofluidic Lens Using Speckle Referencing-DSPI

Abstract

Tunable optofluidic lenses, ranging from in-plane micro-lenses to bulky out-of-plane lenses, were the subjects of research and analysis with much interest over the past decade. However, a reliable and practically feasible metrological approach and methodology is yet to be developed to study the properties and performance of the optofluidic lenses. In this report, we propose and demonstrate to utilize digital speckle pattern interferometry (DSPI) with the aid of speckle referencing to non-destructively evaluate the performance of a pneumatically driven out-of-plane optofluidic lens through measuring the 3-dimensional interface deformation.