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Optofluidic Chip System with Integrated Fluidically Controllable Optics

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Abstract

This paper describes an optofluidic approach for fiber coupling and flexible beam shaping in the central plane of all-glass microfluidic devices. Special microchannels with half circular sidewalls have been integrated into the device in order to create micro lens systems. Focal length of each of these micro-lenses can be controlled by the refractive index of the fluid inside the channel. That way adaptive, microfluidically controllable lens systems can be realized for use in beam shaping and light-section creation. A prototyped chip with five parallel fluidic channels with different distances between them and with free adjustable and combinational fluidic refraction indices inside has been prepared and investigated. A total of six fiber channels on each side are used for light input and output. The developed chip concept has a great potential for application in small biochemical analysis units like lab-on-a-chip or μ-total analysis systems. Simulations of light distribution inside the chip in dependence on fluid refraction indices as well as geometrical parameters are in accordance with realized transmission measurements.

© 2009 OSA/SPIE

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