The objective of this effort was to fabricate a waveguide integrated in a polymer microfluidic chip in order to deliver
excitation light to fluorescent probes contained in a fluidic channel. Instead of exciting the volume at a certain point
along a fluidic channel, the goal herein was to excite all the probes contained along the length of the fluidic channel.
An air-waveguide structure was designed and integrated into a polymer microfluidic chip. Fabrication of the
microfluidic chip was carried out by double-sided hot embossing of poly methyl methacrylate (PMMA) in sheet form.
The efficacy of the waveguide was evaluated by coupling light from a laser into it and testing the fluorescence
intensity from dye contained in the microfluidic channel. The results demonstrate illumination of the entire length of
the microfluidic channel with excitation wavelength light from the waveguide. Details of the design, fabrication
process and initial experimental results are presented in the course of this paper.
In this paper, we present a quasi-three-dimensional micro-fluidic device that has been constructed using the LIGA technology at CAMD. The idea is centered in the modular construction of molded plastic devices. A primary master template was patterned into SU-8 and PMMA, from which we made a reversed insertion mold by electroplating Nickel on it. Chips were patterned by hot embossing and the complex structure was obtained by stacking one layer on top of the other. Alignment marks were placed in each different layer to allow the accurate positioning of the structures. Each layer is a 2-dimensional micro-fluidic system and liquids can go from one level to another level, back and forth, producing this almost three-dimensional behavior. This work aims to introduce concepts and features that will be a step towards a complete modularization of micro-fluidic devices.
The objective of this work was to develop a thermally-driven bimetallic actuator for application in high temperature environments. The actuator was designed to drive distributed air flow control valves in a gas turbine combustor. The valves control localized cooling air flows in response to rises in temperature, leading to more uniform and complete combustion. The actuator is a passive thermo-mechanical device formed from bimorph elements concatenated in a recurve architecture to obtain the required forces and deflections. An electroplating process for depositing an Invar-like alloy in deep recess was developed and used in the fabrication of prototypes. Fabrication of additional protypes and testing are continuing.