Spin characterization of high-stability optically levitated particles in dual-beam traps

Area of Science:

• Physics
• Optical Trapping
• Microparticle Manipulation

Background:

• Optically levitated spinning particles are crucial for inertial sensing, precision measurement, and quantum science.
• Single-beam optical traps limit stability and rotational speed for micro-vaterite particles.
• Existing dual-beam configurations have not achieved stable high-rate spinning of vaterite particles.

Purpose of the Study:

• To develop a stable method for high-rate spinning of vaterite particles using optical levitation.
• To overcome the limitations of single-beam traps in particle stability and rotation.
• To explore the potential of dual-beam configurations for advanced particle manipulation.

Main Methods:

• Utilized two counter-propagating laser beams with opposite circular polarization.
• Levitated and drove 3.58-μm-diameter vaterite particles to high spin rates.
• Characterized particle orientation under varying pressure conditions.

Main Results:

• Achieved a two-order-of-magnitude improvement in translational oscillation frequency and spin rate compared to single-beam traps.
• Reached 6-MHz rotation at 20 Pa without increasing thermal motion at low pressures.
• Demonstrated a fivefold improvement in orientational stability.

Conclusions:

• The dual-beam optical levitation system provides a stable platform for high-rate particle spinning.
• This technique significantly enhances particle stability and rotational capabilities.
• Offers potential for advanced applications in sensing and physical research.