Unidirectional lateral optical forces on polarizable nanoparticles near drift-biased graphene metasurfaces

Nayan Kumar Paul; J. S. Gomez-Diaz

doi:10.1117/12.2567735

20 August 2020 Unidirectional lateral optical forces on polarizable nanoparticles near drift-biased graphene metasurfaces

Nayan Kumar Paul, J. S. Gomez-Diaz

Author Affiliations +

Proceedings Volume 11461, Active Photonic Platforms XII; 1146106 (2020) https://doi.org/10.1117/12.2567735
Event: SPIE Nanoscience + Engineering, 2020, Online Only

Abstract

Under adequate illumination of plane wave, polarizable nanoparticles near a plasmonic surface acquire out-of-plane polarization spin and experience lateral forces thanks to the recoil of directional surface plasmons excited on the surface. The strength and direction of such forces are mostly controlled by the power and direction of the incoming light. Here, we show that illuminating a nanoparticle near a drift-biased graphene metasurface excites unidirectional surface plasmons whose trajectory is fully determined by the drift-current and does not depend on the direction of incoming light. Due to momentum conservation, unidirectional lateral forces are exerted on the particle with a strength that can be controlled and even amplified over two orders of magnitude by the applied DC bias. Our findings may resolve delicate laser beam alignment issues and reduce the beam intensity required for the trapping and routing of nanoparticles.

Conference Presentation

Citation Download Citation

Nayan Kumar Paul and J. S. Gomez-Diaz "Unidirectional lateral optical forces on polarizable nanoparticles near drift-biased graphene metasurfaces", Proc. SPIE 11461, Active Photonic Platforms XII, 1146106 (20 August 2020); https://doi.org/10.1117/12.2567735

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