期刊
NANO LETTERS
卷 21, 期 14, 页码 6268-6273出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c02083
关键词
Plasmonic trapping; Spin-orbit angular-momentum transfer; Plasmonic nanogap antenna; Localized surface plasmon
类别
资金
- JSPS KAKENHI [JP16H06506, JP18H03882, JP18H05205, JP19H04529, JP20K05290, JP20K15145, JP21H04657]
This study demonstrates controlled orbital rotation of a single fluorescent nanodiamond trapped by a gold trimer nanoantenna using either rotating linearly polarized light or circularly polarized light. The rotation direction is found to be opposite to the light's polarization rotation, and different excitation sequences and the generation of a Poynting vector vortex of reversed handedness are responsible for this inversion.
The ability to control the motion of single nanoparticles or molecules is currently one of the major scientific and technological challenges. Despite tremendous progress in the field of plasmonic nanotweezers, controlled nanoscale manipulation of nanoparticles trapped by a plasmonic nanogap antenna has not been reported yet. Here, we demonstrate the controlled orbital rotation of a single fluorescent nanodiamond trapped by a gold trimer nanoantenna irradiated by a rotating linearly polarized light or circularly polarized light. Remarkably, the rotation direction is opposite to the light's polarization rotation. We numerically show that this inversion comes from sequential excitation of individual nanotriangles in the reverse order when the linear polarization is rotated, whereas using a circular polarization, light-nanoparticle angular momentum transfer occurs via the generation of a Poynting vector vortex of reversed handedness. This work provides a new path for the control of light-matter angular momentum transfer using plasmonic nanogap antennas.
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