Low-cost fluorescence microscope with microfluidic device fabrication for optofluidic applications.

Area of Science:

• Optofluidics and microscale fluid dynamics.
• Laser-induced phenomena and bubble dynamics.
• Development of custom optical microscopy systems.

Background:

• Optofluidic devices enable precise fluid manipulation at micro- and millimeter scales.
• Laser-induced cavitation offers a method for generating controlled microbubbles.
• Characterizing microscale fluid flow is crucial for various scientific applications.

Purpose of the Study:

• To describe a dedicated optical setup for studying laser-induced cavitation in microchannels.
• To extend the setup for analyzing fluid flow using fluorescence-Particle Image Velocimetry (PIV).
• To provide protocols for in-house microchannel fabrication for optical experiments.

Main Methods:

• Utilizing a tightly focused laser beam to induce local evaporation and microbubble formation.
• Employing high-speed microscopy and digital image analysis to track bubble interface dynamics.
• Adapting the optical setup for fluorescence-Particle Image Velocimetry (PIV) for fluid flow analysis.

Main Results:

• Successful generation and tracking of laser-induced microbubbles within a microchannel.
• Demonstration of fluid flow analysis using fluorescence-PIV with minimal system modifications.
• Development of protocols for fabricating custom microchannels as sample holders.

Conclusions:

• The described optical setup provides a versatile platform for studying optofluidic phenomena.
• The system allows for cost-effective, in-house construction of a fluorescence microscope.
• This approach facilitates detailed investigation of microbubble dynamics and microscale fluid transport.