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Proceedings Paper

Integration of waveguides for optical detection in microfabricated analytical devices
Author(s): Joerg P. Kutter; Klaus B. Mogensen; Peter Friis; Anders M. Jorgensen; Nickolaj J. Petersen; Pieter Telleman; Joerg Huebner
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Paper Abstract

Buried optical channel waveguides integrated with a fluidic channel network on a planar microdevice are presented. The waveguides were fabricated using silica-on-silicon technology with the goal to replace bulk optical elements and facilitate various optical detection techniques for miniaturized total analysis systems or lab-on-a-chip systems. Waveguide structures with core layers doped with germanium were employed for fluorescence measurements, while waveguides with nitrogen- only doped core layers were used for absorbance measurements. By the elimination of germanium oxygen deficiency centers transmission of light down to 210nm was possible, allowing absorance measurements in the mid and far UV region (210 to 280nm), which is the region where a large number of different molecules absorb light. Robust, alignment-free microdevices, which can easily be hooked up to a number of light sources and detectors were used for fluorescence measurements of two dyes, fluorescein and Bodipy, and absorbance measurements of a stres-reducing drug, propranolol. The lowest detected concentrations were 250pM for fluorescein, 100nM for Bodipy and 12(mu) M for propranolol.

Paper Details

Date Published: 18 August 2000
PDF: 8 pages
Proc. SPIE 4177, Microfluidic Devices and Systems III, (18 August 2000); doi: 10.1117/12.395677
Show Author Affiliations
Joerg P. Kutter, Mikroelektronik Ctr./Technical Univ. of Denmark (Denmark)
Klaus B. Mogensen, Mikroelektronik Ctr./Technical Univ. of Denmark (Denmark)
Peter Friis, Mikroelektronik Ctr./Technical Univ. of Denmark (Denmark)
Anders M. Jorgensen, Mikroelektronik Ctr./Technical Univ. of Denmark (United States)
Nickolaj J. Petersen, Mikroelektronik Ctr./Technical Univ. of Denmark (Denmark)
Pieter Telleman, Mikroelektronik Ctr./Technical Univ. of Denmark (Denmark)
Joerg Huebner, Mikroelektronik Ctr./Technical Univ. of Denmark (Denmark)


Published in SPIE Proceedings Vol. 4177:
Microfluidic Devices and Systems III
Carlos H. Mastrangelo; Holger Becker, Editor(s)

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