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. 2023 Oct 20;131(16):163601.
doi: 10.1103/PhysRevLett.131.163601.

Trapping Microparticles in a Structured Dark Focus

F Almeida  1 , I Sousa  1 , O Kremer  2 , B Pinheiro da Silva  3 , D S Tasca  3 , A Z Khoury  3 , G Temporão  2 , T Guerreiro  1
Affiliations

Trapping Microparticles in a Structured Dark Focus

F Almeida et al. Phys Rev Lett. .

Abstract

We experimentally demonstrate stable trapping and controlled manipulation of silica microspheres in a structured optical beam consisting of a dark focus surrounded by light in all directions-the dark focus tweezer. Results from power spectrum and potential analysis demonstrate the nonharmonicity of the trapping potential landscape, which is reconstructed from experimental data in agreement to Lorentz-Mie numerical simulations. Applications of the dark tweezer in levitated optomechanics and biophysics are discussed.

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