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Trapping metallic particles using focused Bloch surface waves.

Yifeng Xiang¹, Xi Tang, Yanan Fu

¹Institute of Photonics, Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China. dgzhang@ustc.edu.cn.

|January 3, 2020

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Researchers developed a new method to stably trap metallic particles using focused Bloch surface waves. This technique overcomes limitations of traditional optical tweezers for mesoscopic/Mie particles, enabling new applications in sensing and imaging.

Area of Science:

Photonics and Plasmonics
Optical Trapping
Nanotechnology

Background:

Metallic particles are crucial for optical sensing, imaging, and electric field enhancement.
Traditional optical tweezers struggle to trap mesoscopic/Mie metallic particles due to strong scattering forces.
Stable trapping and transport of metallic particles are essential for advanced applications.

Purpose of the Study:

To demonstrate stable trapping of metallic particles using focused Bloch surface waves.
To overcome the limitations of conventional optical tweezers for mesoscopic/Mie metallic particles.
To enable new applications in optical sensing, imaging, and electric field enhancement.

Main Methods:

Utilizing focused Bloch surface waves propagating in the near-field of a dielectric multilayer structure with a photonic band gap.

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Exciting Bloch surface waves using an annular beam with azimuthal polarization and a high-numerical-aperture objective.

Performing numerical simulations to calculate optical forces on gold particles.

Main Results:

Metallic particles, specifically gold particles, were stably trapped using focused Bloch surface waves.
The developed method successfully overcomes the scattering force limitations of traditional optical tweezers.
Numerical simulations of optical forces on gold particles showed consistency with experimental observations.

Conclusions:

Focused Bloch surface waves provide an effective solution for stably trapping metallic mesoscopic/Mie particles.
This advancement opens possibilities for enhanced optical sensing, imaging, and electric field manipulation.
The technique offers a significant improvement over traditional optical trapping methods for metallic nanoparticles.