Optical levitation

Dag Hanstorp

doi:10.1117/12.3027956

3 October 2024 Optical levitation

Dag Hanstorp

Author Affiliations +

Proceedings Volume PC13112, Optical Trapping and Optical Micromanipulation XXI; PC131120Q (2024) https://doi.org/10.1117/12.3027956
Event: Nanoscience + Engineering, 2024, San Diego, California, United States

Abstract

In optical levitation, a focused, vertically aligned laser beam is used to trap micrometer sized where the photon pressure from the light is balancing gravity. I will in this work review the field by presenting a number of different experiments. I will show how the Foerster Resonance Energy Transfer (FRET) mechanism can be used to track the dynamics of two coalescing glycerol droplets. Second, I will show the directional Mie spectrum of evaporating water droplets arrange in consecutive Fano Combs. This observation is explained by a quantum analogy where the droplet can be seen as an "optical atom" with angular momentum, tunneling, and excited states. Third, I will show how we have used optical levitation to create a single droplet version of Millikan's experiment where the effects of a single electron removal can be observed by the naked eye and measured with a ruler. Finally, I will present our ongoing efforts to trap nanometer sized particles in vacuum and a method to levitate metallic particles.

Conference Presentation

Citation Download Citation

Dag Hanstorp "Optical levitation", Proc. SPIE PC13112, Optical Trapping and Optical Micromanipulation XXI, PC131120Q (3 October 2024); https://doi.org/10.1117/12.3027956

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