Increasing Optical Path Lengths in Micro-Fluidic Devices Using a Multi-Pass Cell.

This study presents a novel absorption cell with a circular geometry that can be integrated into microfluidic devices for optical spectroscopy applications. The absorption cell is made of PDMS/SU8 and offers an optical path length that is 8.5 times its diameter, resulting in a significant increase in the sensitivity of the measurements. Overall, this design provides a reliable and efficient solution for optical spectroscopy in microfluidic systems, enabling the precise detection and analysis of small quantities of analytes.

Optical cross-connect system based on the White cell and three-state microelectromechanical system: experimental demonstration of the quartic cell.

We present a proof of concept (design, simulations, and experimental results) for an optical cross-connection device based on the optical White cell and a three-state microelectromechanical system tilting mirror array. We describe in detail the implementation of an underpopulated quartic White cell configuration. We discuss the aberrations associated with the output of the system.