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Area of Science:

  • Optics
  • Quantum Mechanics
  • Nanotechnology

Background:

  • Spin-orbit interactions in evanescent fields are crucial for understanding light-matter interactions.
  • Polarization-dependent lateral forces on particles arise from spin momentum transfer.
  • The interplay between particle resonances, light helicity, and lateral forces remains an open research question.

Purpose of the Study:

  • To investigate polarization-dependent phenomena in a microfiber-microcavity system with whispering-gallery-mode resonances.
  • To understand how particle resonances synergize with incident light's helicity and lateral forces.
  • To unify and intuitively understand polarization-dependent optical forces.

Main Methods:

  • Utilizing a microfiber-microcavity system to host whispering-gallery-mode resonances.
  • Analyzing the influence of light polarization and helicity on lateral forces at resonance.
  • Developing a generalized theoretical framework for optical lateral forces.

Main Results:

  • Lateral forces at resonance are not directly proportional to incident light helicity.
  • Polarization-dependent coupling and resonance phases contribute additional helicity effects.
  • Optical lateral forces exist even with zero incident light helicity.

Conclusions:

  • Introduced a generalized law for optical lateral forces, unifying polarization-dependent phenomena.
  • Demonstrated novel helicity contributions arising from resonance effects.
  • Opened avenues for engineering polarization-controlled resonant optomechanical systems.