What is Optical Trapping?
Optical trapping, also known as
optical tweezers, is a technique that uses a highly focused laser beam to manipulate microscopic particles. This method allows scientists to hold and move small objects, such as nanoparticles, cells, and even individual molecules, with high precision.
How Does Optical Trapping Work?
Optical trapping relies on the
radiation pressure exerted by light. When a laser beam is focused through a microscope objective lens, it creates a gradient force that can trap particles at the focal point. The particle experiences a restoring force proportional to its displacement from the focal point, effectively holding it in place.
It is generally limited to particles in the micron to nanometer range.
High-intensity lasers can cause
photodamage to biological samples.
Trapping efficiency decreases for very small particles due to
Brownian motion.
Conclusion
Optical trapping is a versatile and powerful tool in nanotechnology, enabling precise manipulation of nanoparticles and biological samples. Despite its limitations, ongoing research and technological advancements continue to expand its applications and capabilities.
