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Phase-transmission-grating-based compact optofluidic refractometer.

Hongbin Yu¹, Guangya Zhou, Fook Siong Chau

¹Department of Mechanical Engineering, Micro/Nano Systems Initiative Technology, National University of Singapore, Singapore 117576.

|June 17, 2009

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This study presents a compact optofluidic refractometer using a grating-integrated microfluidic chip. Thicker gratings enhance sensitivity for refractive index (RI) measurements but reduce the measurable range.

Area of Science:

Optofluidics
Nanophotonics
Microfluidics

Background:

Refractive index (RI) sensing is crucial in various scientific fields.
Existing refractometer designs can be bulky or complex.
Optofluidic devices offer miniaturization and integration potential.

Purpose of the Study:

To demonstrate a compact optofluidic refractometer.
To investigate the effect of grating structure parameters on device performance.
To establish a theoretical and experimental understanding of the device's working principle.

Main Methods:

Integration of a grating structure with rectangular grooves into a microfluidic network.
Utilizing the modulation of zeroth-order diffraction intensity for RI sensing.

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Theoretical analysis and experimental validation of device performance.

Main Results:

The device's working principle relies on RI-induced modulation of transmitted light intensity.
Device sensitivity and measurement range are inversely related to grating thickness.
Theoretical predictions and experimental results show strong agreement.

Conclusions:

A compact and effective optofluidic refractometer based on grating-enhanced light modulation has been developed.
Grating thickness is a critical parameter for tuning refractometer sensitivity and measurement range.
Further improvements in sensitivity can be achieved with lower-limit detectors.