Chiral particles in the dual-beam optical trap

Area of Science:

• Optics and Photonics
• Soft Matter Physics
• Nanotechnology

Background:

• Chiral microparticles, specifically spherical chiral microresonators, exhibit unique optical properties due to their supramolecular helicoidal structure.
• The asymmetric response of these particles to specific light helicity and wavelength is key to their manipulation.

Purpose of the Study:

• To investigate the dynamics of chiral microparticles within a dual-beam optical trap.
• To explore how polarization states of dual light beams influence particle trapping position and rotational frequency.

Main Methods:

• Utilizing a dual-beam optical trap setup to confine chiral microparticles.
• Investigating both symmetric and asymmetric polarization configurations of the interfering light beams.
• Analyzing the asymmetric transmission properties of the chiral particles.

Main Results:

• A tunable wash-board potential was created by exploiting polarization-controlled asymmetric transmission, enabling axial trapping position control.
• Asymmetric polarization configurations induced controlled rotation of the trapped chiral particles.
• Complex dynamics were observed in the optical binding of rotating particles.

Conclusions:

• Dual-beam optical traps offer precise control over chiral microparticle dynamics through polarization manipulation.
• The study highlights the potential for creating tunable potentials and controlling particle rotation for advanced optical manipulation applications.