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Lensless Fluorescent Microscopy on a Chip

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Published on: August 17, 2011

An electrokinetically tunable optofluidic bi-concave lens.

Haiwang Li¹, Chaolong Song, Trung Dung Luong

¹School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang, Avenue, Singapore 639798.

|July 11, 2012

Summary

This study introduces a novel optofluidic lens capable of both focusing and diverging light. By combining fluid flow and electro-osmosis, the lens

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Area of Science:

Optofluidics
Microfluidics
Photonics

Background:

Optofluidic lenses offer tunable optical properties.
Controlling liquid interfaces is key for lens functionality.
Integrating electrical control enhances performance.

Purpose of the Study:

To design and demonstrate an optofluidic in-plane bi-concave lens.
To achieve both light focusing and diverging capabilities.
To control lens performance using electro-osmosis and fluid flow.

Main Methods:

Numerical simulations using finite volume and level set methods.
Experimental fabrication using soft lithography in polydimethylsiloxane (PDMS).
Utilizing a liquid core-liquid cladding (L(2)) configuration with specific fluids.

Main Results:

Demonstrated tunable focal length in focusing mode.
Achieved adjustable divergent angles in diverging mode.
Showed good agreement between numerical simulations and experimental outcomes.

Conclusions:

The proposed optofluidic lens successfully integrates focusing and diverging functions.
External electric fields provide effective control over optical performance.
This design presents a versatile platform for tunable micro-optical devices.