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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
Published on: November 21, 2019
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The primeval optical evolving matter by optical binding inside and outside the photon beam.
Chih-Hao Huang1, Boris Louis2,3, Roger Bresolí-Obach4,5,6
1Department of Applied Chemistry, College of Science, National Yang Ming Chiao Tung University, Hsinchu, 30010, Taiwan.
Nature Communications
|September 10, 2022
Summary
Optical binding can assemble nanoparticles outside direct laser illumination. This study shows light scattering creates binding networks, enabling particle assembly beyond the focal spot.
Area of Science:
- Nanophotonics and Plasmonics
- Optical Manipulation and Trapping
Background:
- Optical binding, the light-induced assembly of particles, typically requires direct laser irradiation.
- Existing research has not explored optical binding phenomena occurring outside the immediate focal spot of a laser beam.
Purpose of the Study:
- To demonstrate and investigate optical binding occurring beyond the focal spot of a single laser beam.
- To explore the mechanisms behind light-induced assembly of nanoparticles in regions not directly illuminated.
Main Methods:
- Utilized a single, tightly focused laser beam to trap gold nanoparticles at an interface.
- Assembled up to three gold nanoparticles in a linear arrangement within the laser's focal spot.
- Analyzed scattered light interactions and nanoparticle motion outside the focal area.
Main Results:
- A linear arrangement of gold nanoparticles within the focal spot efficiently scattered the trapping laser.
- Scattered light generated discrete arc-shaped potential wells outside the focal spot, leading to nanoparticle trapping.
- Externally trapped nanoparticles exhibited correlated motion with directly illuminated particles and among themselves.
Conclusions:
- Optical binding can extend beyond the focal spot through back-scattered light and multi-channel scattering.
- A dynamic optical binding network is formed, enabling assembly of particles not directly irradiated.
- This expands the understanding of optical binding for creating complex, light-induced many-body systems.
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