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Proceedings Paper

A highly sensitive optofluidics-based refractometer in a Young interferometer design
Author(s): Sarun Sumriddetchkajorn; Kosom Chaitavon; Jitti Nukeaw
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Paper Abstract

This paper proposes a highly sensitive and compact optofluidics-based refractometer. Our key idea is based on the use of a two-channel microfluidic chip in a free-space Young interferometer structure that provides an inherent advantage in cancelling the unwanted optical phase noise induced from the surrounding environment during optical beam propagation. By using a 655-nm monochromatic light that travels in free space for 57.5 cm and a microfluidic chip designed to have two fluidic channels in parallel with a distance between channels of 900 μm and a channel depth of 100 μm, our simulation indicates that analysis of the movement of the interference fringe offers a sensitivity of better than 1.31×10-4 in measuring the change of the refractive index. A better than thousand-fold improvement can also be accomplished by investigating the amplitude change of the interference fringe via a > 10-bit digitalization. Our experiment in analyzing the change of the refractive index of the sucrose solution will be discussed. Polarization insensitivity and simplicity in design and implementation are also additional key advantages.

Paper Details

Date Published: 13 May 2010
PDF: 9 pages
Proc. SPIE 7726, Optical Sensing and Detection, 77260Y (13 May 2010); doi: 10.1117/12.852747
Show Author Affiliations
Sarun Sumriddetchkajorn, National Electronics and Computer Technology Ctr. (Thailand)
Kosom Chaitavon, National Electronics and Computer Technology Ctr. (Thailand)
Jitti Nukeaw, King Mongkut's Institute of Technology Ladkrabang (Thailand)

Published in SPIE Proceedings Vol. 7726:
Optical Sensing and Detection
Francis Berghmans; Anna Grazia Mignani; Chris A. van Hoof, Editor(s)

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