🔬 A Faster Way to Capture Bacteria: Laser-Powered Fiber Optic Trap
Osaka Metropolitan University researchers have developed a technique using a laser and a gold-coated optical fiber to quickly concentrate bacteria from a liquid sample.
The method achieves a more than tenfold improvement in efficiency over conventional approaches, collecting thousands to hundreds of thousands of bacteria or microparticles from a 20-microliter sample in 60 seconds.
How the technique works:
The technique involves a metallic thin-film-coated optical fiber that acts as a localized photothermal source. When a laser is beamed into the fiber, the gold-coated tip absorbs light and converts it into heat, inducing fluid motion and bubble formation. This creates three-dimensional convection currents that transport particles and concentrate them between the bubble and the fiber tip.
A key advantage:
According to lead author Takuya Iida, the system captures targets from all directions within the liquid, unlike conventional photothermal techniques that primarily operate in two dimensions.
Next steps:
The researchers plan to integrate the technique with downstream analytical tools and test it across a broader range of materials and conditions.