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Proceedings Paper

Refractive index detection of nanolitre samples in a microfluidic chip with a Michelson interferometer
Author(s): Yangcheng Luo; Huiqing Chen; Kun Liu; Changyong Zhu; Junshan Liu
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Paper Abstract

A Michelson interferometer is designed for the refractive index detection of nanolitre samples in a microfluidic chip. A He-Ne laser beam (power of 0.5mW) is divided into a detection beam and a reference beam by a beam splitter. Equal inclination interference patterns (circular fringes) formed by the reference beam and the detection beam passing through the chip channel (width of 65μm and depth of 50μm) are observed clearly. The intensity of the central part of the interference pattern changes while rotating the chip. Signals of the light intensity versus the rotation angle are collected by a detector (consisted of a fiber and a photomultiplier) and recorded by a computer. By rotating the chip from 0° to +17°, signals are measured when the chip channel is filled with air, water and sodium hydroxide solution NaOH (with a refractive index of 1.3450). Fitting the signal curves with Origin program in a theoretical equation, the refractive indices of air, water and NaOH solution in the chip channel are derived. The results coincided basically with those measured by an Abbe refractometer.

Paper Details

Date Published: 12 December 2018
PDF: 7 pages
Proc. SPIE 10848, Micro-Optics and MOEMS, 1084804 (12 December 2018); doi: 10.1117/12.2503854
Show Author Affiliations
Yangcheng Luo, Shaoguan Univ. (China)
Huiqing Chen, Shaoguan Univ. (China)
Kun Liu, Shaoguan Univ. (China)
Changyong Zhu, Shaoguan Univ. (China)
Junshan Liu, Dalian Univ. of Technology (China)

Published in SPIE Proceedings Vol. 10848:
Micro-Optics and MOEMS
Yuelin Wang; Huikai Xie, Editor(s)

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