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Trapping microparticles in a structured dark focus

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arxiv 2302.01953 v2 pith:7J3TGSYG submitted 2023-02-03 quant-ph physics.optics

Trapping microparticles in a structured dark focus

classification quant-ph physics.optics
keywords darkfocustrappingdemonstratepotentialstructuredtweezeragreement
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 so-called Dark Focus Tweezer. Results from power spectrum and potential analysis demonstrate the non-harmonicity of the trapping potential landspace, 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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