Trapping and rotating microparticles and bacteria with moiré-based optical propelling beams

Area of Science:

• Optics and Photonics
• Biophysics
• Microfluidics

Background:

• Optical tweezers are essential tools for manipulating microscopic objects.
• Existing methods often require complex mechanical setups or phase-sensitive interference.
• Controlling rotation of microparticles and cells with high precision remains a challenge.

Purpose of the Study:

• To propose and demonstrate a novel moiré-based rotating optical tweezers system.
• To achieve computer-controlled trapping and rotation of microparticles and biological samples.
• To explore the potential of white-light patterns for optical manipulation.

Main Methods:

• Utilizing a moiré-based optical setup to generate rotating optical tweezers.
• Demonstrating trapping and rotation of polystyrene beads and Escherichia coli cells.
• Implementing computer control for precise adjustment of rotation speed and direction.

Main Results:

• Successful trapping and rotation of microparticles and Escherichia coli cells.
• Demonstrated full computer control over rotation speed and direction.
• Experimentally generated white-light propelling beams and arrays.

Conclusions:

• The moiré-based rotating optical tweezers offer a versatile and controllable method for micro-manipulation.
• This technology obviates the need for mechanical movement or phase-sensitive interference.
• Future work can explore incoherent white-light rotating patterns for optical tweezing and particle manipulation.