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Published on: April 11, 2025
Modelling and optimization of micro optofluidic lenses
Chaolong Song1, Nam-Trung Nguyen, Say-Hwa Tan
1School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore639798.
Lab on a Chip
|April 17, 2009
Summary
Researchers developed a novel circular optofluidic lens using three laminar streams. This design enables precise control over lens curvature and focal length, validated by experimental results.
Area of Science:
- Optofluidics
- Fluid dynamics
- Lens design
Background:
- Optofluidic lenses offer tunable focal lengths.
- Previous designs often faced limitations in curvature control and fabrication.
Purpose of the Study:
- To model and experimentally validate a novel liquid-core liquid-cladding optofluidic lens with a circular design.
- To establish relationships between fluid flow and lens optical properties.
Main Methods:
- Utilized two-dimensional dipole flow theory for modeling.
- Employed a circular chamber design for fluid stream confinement.
- Fabricated a polydimethylsiloxane (PDMS) device with a 1 mm diameter chamber.
- Characterized fluid dynamics and lens shape using fluorescent dyes and tracing particles.
Main Results:
- Accurate prediction of stream lines and interface curvature.
- Established a direct correlation between flow rate ratio and lens focal length.
- Demonstrated the formation of liquid-core liquid-cladding lenses with tunable, perfect curvatures.
- Experimental results closely matched analytical predictions.
Conclusions:
- The circular chamber design facilitates the creation of optofluidic lenses with superior curvature control compared to rectangular designs.
- The developed model accurately predicts lens performance, enabling precise focal length tuning.
- This work presents a promising platform for advanced optofluidic applications.
