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Microfluidics and Nanofluidics

, Volume 4, Issue 1–2, pp 3–16 | Cite as

Optofluidic waveguides: I. Concepts and implementations

  • Holger Schmidt
  • Aaron R. Hawkins
Research Paper

Abstract

We review recent developments and current status of liquid-core optical waveguides in optofluidics with emphasis on suitability for creating fully planar optofluidic labs-on-a-chip. In this first of two contributions, we give an overview of the different waveguide types that are being considered for effectively combining micro and nanofluidics with integrated optics. The large number of approaches is separated into conventional index-guided waveguides and more recent implementations using wave interference. The underlying principle for waveguiding and the current status are described for each type. We then focus on reviewing recent work on microfabricated liquid-core antiresonant reflecting optical (ARROW) waveguides, including the development of intersecting 2D waveguide networks and optical fluorescence and Raman detection with planar beam geometry. Single molecule detection capability and addition of electrical control for electrokinetic manipulation and analysis of single bioparticles are demonstrated. The demonstrated performance of liquid-core ARROWs is representative of the potential of integrated waveguides for on-chip detection with ultrahigh sensitivity, and points the way towards the next generation of high-performance, low-cost and portable biomedical instruments.

Keywords

Optofluidics Integrated optics Waveguides Fluorescence spectroscopy Single molecule detection 

Notes

Acknowledgments

We gratefully acknowledge the contributions of our colleagues D.W. Deamer, H.F. Noller, J.Z. Zhang, U. Hakanson, and students D. Yin, J.P, Barber, P. Measor, E. Lunt, M. Rudenko, and S. Kuehn. We also acknowledge funding for this work by the National Institutes of Health (NIH/NIBIB) under grants R21EB003430 and R01EB006097, the National Science Foundation (NSF) under grant ECS-0528730, a NASA/UARC Aligned Research Program (ARP) grant, a California Systemwide Biotechnology Research and Education Program Training Grant (UC-GREAT 2005-245), a National Academies Keck Futures Initiative Award (NAKFI-Nano14), and a grant from the David Huber Foundation.

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  1. 1.School of Engineering, MS: SOE-2, UC Santa CruzSanta CruzUSA
  2. 2.ECEn DepartmentBrigham Young UniversityProvoUSA

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