12 December 2018 Refractive index detection of nanolitre samples in a microfluidic chip with a Michelson interferometer
Author Affiliations +
Proceedings Volume 10848, Micro-Optics and MOEMS; 1084804 (2018) https://doi.org/10.1117/12.2503854
Event: International Symposium on Optoelectronic Technology and Application 2018, 2018, Beijing, China
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.
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yangcheng Luo, Huiqing Chen, Kun Liu, Changyong Zhu, and Junshan Liu " Refractive index detection of nanolitre samples in a microfluidic chip with a Michelson interferometer", Proc. SPIE 10848, Micro-Optics and MOEMS, 1084804 (12 December 2018); doi: 10.1117/12.2503854; https://doi.org/10.1117/12.2503854
PROCEEDINGS
7 PAGES


SHARE
Advertisement
Advertisement
Back to Top