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5 October 2023 Metasurface microparticles driven by optical forces
Mikael Käll
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Proceedings Volume PC12649, Optical Trapping and Optical Micromanipulation XX; PC1264916 (2023) https://doi.org/10.1117/12.2678008
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States
Abstract
High-index dielectric metasurfaces that deflect light or alter its polariztion state experience photon recoil forces and torques due to conservation of linear and angular momentum. We utilized this effect to construct miniature "metavehicles" able to navigate across a surface in water under plane-wave illumination while being steered through the incident polarization [1]. The control scheme does not involve gradient forces, in contrast to the vast majority of previous optical manipulation studies, yet the forces generated are strong enough to let the metavehicles work as transporters of microscopic cargo, such as biological cells. Depending on how the metasurface is constructed, metavehicles can be optimized for different behaviours and functionalities, thereby opening the door to novel fundamental studies and applications in fields like microrobotics, micromachines, and active matter. [1] Andrén et al, Nature Nanotechnology 16, 970-974 (2021).
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Mikael Käll "Metasurface microparticles driven by optical forces", Proc. SPIE PC12649, Optical Trapping and Optical Micromanipulation XX, PC1264916 (5 October 2023); https://doi.org/10.1117/12.2678008
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KEYWORDS
Angular momentum
Dielectric polarization
Dielectrics
Light sources and illumination
Nanotechnology
Optical manipulation
Photon polarization
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