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Mode-Symmetry-Assisted Optical Pulling by Bound States in the Continuum
Hang Li1, Yongyin Cao1, Rui Feng1
1Institute of Advanced Photonics, School of Physics, <a href="https://ror.org/01yqg2h08">Harbin Institute of Technology</a>, Harbin 150001, China.
Physical Review Letters
|July 12, 2024
Summary
Researchers developed a new method for optical pulling forces (OPFs) using bound states in the continuum. This technique enables strong light-matter interactions for enhanced optical manipulation without increasing light momentum.
Area of Science:
- Optics
- Condensed Matter Physics
- Nanotechnology
Background:
- Optical pushing and trapping are established techniques.
- Optical pulling forces (OPFs) are less understood and limited by momentum transfer.
- Existing methods for OPFs often require increased forward momentum of light.
Purpose of the Study:
- To present a novel mechanism for generating strong optical pulling forces.
- To overcome the limitations of momentum transfer in existing OPF methods.
- To enable enhanced optical manipulation without increasing light momentum.
Main Methods:
- Utilizing bound states in the continuum (BICs).
- Designing background lattice units for enhanced light-matter interaction.
- Leveraging mode symmetry for momentum extraction.
Main Results:
- Demonstrated a mechanism for generating large OPFs.
- Achieved strong interactions between objects and background lattices.
- Showcased OPFs without the need for increased forward momentum of light.
Conclusions:
- The proposed mechanism offers a new route for significant optical manipulation.
- Bound states in the continuum are effective for generating large OPFs.
- This work has potential for exploring light momenta in various media.
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