Nanoparticle orbital rotation, from a nanoscale plasmonic hotspot to the periphery of a laser beam

Christophe Pin; Hideki Fujiwara; Kota Sudo; Ryo Kakuta; Yuji Sunaba; Shutaro Ishida; Keiji Sasaki

doi:10.1117/12.2659394

8 December 2022 Nanoparticle orbital rotation, from a nanoscale plasmonic hotspot to the periphery of a laser beam

Christophe Pin, Hideki Fujiwara, Kota Sudo, Ryo Kakuta, Yuji Sunaba, Shutaro Ishida, Keiji Sasaki

Proceedings Volume 12479, Optical Manipulation and Structured Materials Conference (OMC 2022); 124790X (2022) https://doi.org/10.1117/12.2659394
Event: Optics and Photonics International Congress, 2022, Yokohama, Japan

Abstract

The spin angular momentum of light can induce the orbital rotation of matter via spin-orbit angular momentum conversion. In this work, we demonstrate the orbital rotation of nanoparticles using two different physical mechanisms. First, a nanoscale Poynting vector vortex is created above the nanogap of a plasmonic trimer nanoantenna upon circularly polarized laser irradiation. Using these trimer nanotweezers, single fluorescent nanodiamond trapping and rotation is experimentally achieved. Second, the orbital rotation of VO₂ nanoparticles is achieved using a focused, circularly polarized Gaussian laser beam. We demonstrate that the non-linear optical response caused by the insulator-to-metal phase transition of VO₂ leads to the formation of an annular trapping potential well around the center of the laser beam.

Citation Download Citation

Christophe Pin, Hideki Fujiwara, Kota Sudo, Ryo Kakuta, Yuji Sunaba, Shutaro Ishida, and Keiji Sasaki "Nanoparticle orbital rotation, from a nanoscale plasmonic hotspot to the periphery of a laser beam", Proc. SPIE 12479, Optical Manipulation and Structured Materials Conference (OMC 2022), 124790X (8 December 2022); https://doi.org/10.1117/12.2659394

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