Portal de Periódicos da CAPES

Deep wet etching of fused silica glass for hollow capillary optical leaky waveguides in microfluidic devices

2001; IOP Publishing; Volume: 11; Issue: 3 Linguagem: Inglês

10.1088/0960-1317/11/3/315

1361-6439

Axel Grosse, Matthias Grewe, Henning Fouckhardt,

Electrowetting and Microfluidic Technologies

We report on a technology for the fabrication of hollow capillary optical leaky waveguides in fused silica glass. The fabrication process is based on lithography, wet chemical etching and aligned direct bonding. We have developed a single-layer photoresist soft mask which allows for channel etch depths up to 33 µm in fused silica glass. To our knowledge, such etch depths have never been achieved before in fused silica glass with single-layer soft etch masks. Aligned direct glass-glass bonding is used for the first time to obtain channels with almost circular profiles with diameters between 16 and 66 µm. Capillary optical leaky waveguides embedded into microfluidic devices can be used, for example, for capillary electrophoresis and hyper Rayleigh scattering.