Integrated waveguide with a microfluidic channel in spiral geometry for spectroscopic applications

Linan Jiang, Stanley Pau

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

The authors fabricated and tested a compact optical sensor with an integrated waveguide and a microchannel in spiral geometry. The multimode waveguide, consisting of an SU-8 core of 40 μm thick and 50 μm wide and a fluid cladding layer of 60 μm thick, realizes a light-fluid interaction length of 110 mm within a device area of 4 cm2. The waveguide sensor measures changes in liquid sample concentration and is sensitive to changes in liquid refractive index. Absorbance measurements using the spiral waveguide sensor demonstrate increased sensitivity compared with a linear geometry sensor.

Original languageEnglish (US)
Article number111108
JournalApplied Physics Letters
Volume90
Issue number11
DOIs
StatePublished - Mar 23 2007

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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