A highly sensitive optofluidics-based refractometer in a Young interferometer design
2010
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.
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