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Proceedings Paper

Integrated semiconductor fluorescent detection system for biochip and biomedical applications
Author(s): Evan P. Thrush; Ofer Levi; Ke Wang; Mark A. Wistey; James S. Harris; Stephen J. Smith
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Paper Abstract

As biological analysis systems scale to smaller dimensions, the realization of small and portable biosensors becomes increasingly important. The innovation of integrated fluorescence sensors is now possible due to the development of optoelectronics over the past decade. We present the monolithic integration of vertical cavity surface emitting lasers, PIN photo-detectors and optical emission filters to be used as a fluorescence sensor. The integration will drastically reduce cost and size of fluorescence detection systems. Also, parallel sensing architectures of more than one hundred channels will be possible. The sensor will be utilized for near-IR fluorescence detection. This spectral range is compatible with standard AlGaAs optoelectronic technology and will also reduce background fluorescence from complex bio-fluids such as blood. PIN heterostructure photodetectors have been fabricated and tested. Photodetector experiments show extremely low dark current of less than 500fA/mm, quantum efficiency greater than 85 percent and linear detector response. Optical simulations predict a detection sensitivity lower than 10000 fluorescent molecules in a detection area of 104 micrometers 2.

Paper Details

Date Published: 21 June 2002
PDF: 9 pages
Proc. SPIE 4626, Biomedical Nanotechnology Architectures and Applications, (21 June 2002); doi: 10.1117/12.472094
Show Author Affiliations
Evan P. Thrush, Stanford Univ. (United States)
Ofer Levi, Stanford Univ. (United States)
Ke Wang, Stanford Univ. (United States)
Mark A. Wistey, Stanford Univ. (United States)
James S. Harris, Stanford Univ. (United States)
Stephen J. Smith, Stanford Univ. (United States)


Published in SPIE Proceedings Vol. 4626:
Biomedical Nanotechnology Architectures and Applications
Raymond P. Mariella; Catherine J. Murphy; Michelle Palmer; David A. Dunn; Darryl J. Bornhop; David A. Dunn; Raymond P. Mariella; Catherine J. Murphy; Dan V. Nicolau; Shuming Nie; Michelle Palmer; Ramesh Raghavachari; Darryl J. Bornhop; Ramesh Raghavachari; Shuming Nie; Ramesh Raghavachari, Editor(s)

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