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An optofluidic prism tuned by two laminar flows.

S Xiong¹, A Q Liu, L K Chin

¹School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore.

|March 31, 2011

Summary

This study introduces a tunable optofluidic prism using laminar flow streams for adaptable light manipulation. The device demonstrates precise control over light deviation and beam scanning, enhancing optical signal intensity and enabling light dispersion.

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Area of Science:

Optofluidics
Microfluidics
Optical Engineering

Background:

Traditional optical prisms lack tunability and miniaturization capabilities.
Optofluidic devices offer dynamic control over optical properties through fluid manipulation.
Need for reconfigurable optical components in compact systems.

Purpose of the Study:

To design and demonstrate a tunable optofluidic prism.
To achieve dynamic control over light beam deviation and scanning.
To explore applications in light intensity enhancement and spectral dispersion.

Main Methods:

Fabrication of triangular microfluidic chambers with specific apex angles (70° and 90°).
Utilizing laminar flow of liquids with different refractive indices (benzyl alcohol, DI water, ethylene glycol mixture).
Development of a hydrodynamic model to predict prism tuning via flow rate variations.
Experimental demonstration of light beam scanning and spectral dispersion.

Main Results:

Tunable apex angle from 75° to 135° by adjusting flow rate ratios.
Adjustable deviation angle of the output light beam from -13.5° to 22°.
Demonstrated light beam scanning with a 60 μm tuning range and 65.7% intensity increase.
Achieved light dispersion with a 2.5° deviation angle difference for two laser wavelengths.

Conclusions:

The developed optofluidic prism offers a highly tunable and reconfigurable platform for light manipulation.
The device shows promise for applications requiring dynamic beam steering, intensity modulation, and spectral separation.
The integration of a third flow stream allows transformation into an asymmetric prism for advanced functionalities.