High-speed microparticle isolation unlimited by Poisson statistics.

Area of Science:

• Biotechnology
• Microfluidics
• Laser Physics

Background:

• High-throughput microparticle sorting is crucial for various applications.
• Current methods face limitations due to the trade-off between throughput, purity, and yield, often governed by Poisson statistics.
• Isolating rare microparticles necessitates methods that maintain both high purity and high yield.

Purpose of the Study:

• To develop an on-chip microparticle sorter that overcomes the conventional throughput-purity-yield trade-off.
• To enable high-speed, high-purity, and high-yield isolation of microparticles, particularly for rare particle applications.
• To demonstrate a novel mechanism for microparticle manipulation using laser-induced cavitation.

Main Methods:

• An on-chip microparticle sorter was designed with ultrashort switching windows in time (10 μs) and space (10 μm).
• Femtosecond laser pulses were employed to generate localized transient cavitation bubbles within a microchannel.
• Microparticles were acoustically focused into a dense stream and deflected by the laser-induced bubbles at a flow speed of 1 m s^-1.

Main Results:

• The developed sorter successfully overcomes the Poisson trade-off inherent in traditional microparticle sorting.
• The method achieves high-speed isolation of microparticles with simultaneous high purity and high yield.
• Demonstrated precise manipulation of microparticles using femtosecond laser-induced cavitation bubbles.

Conclusions:

• The novel microparticle sorting technique offers a significant advancement for high-throughput applications.
• This method is particularly valuable for rare microparticle isolation where missing events must be avoided.
• The use of femtosecond laser-induced cavitation provides a powerful tool for microfluidic manipulation and particle sorting.