Journal
NANO LETTERS
Volume 12, Issue 7, Pages 3645-3649Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl301347j
Keywords
Metal nanoneedle; laser ablation; optical vortex; chirality; singular optics
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Funding
- Japan Society for the Promotion of Science [21360026]
- Grants-in-Aid for Scientific Research [21360026, 23360024, 24656009, 23656041, 23656040] Funding Source: KAKEN
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We discovered for the first time that light can twist metal to control the chirality of metal nanostructures (hereafter, chiral metal nanoneedles). The helicity of optical vortices is transferred to the constituent elements of the irradiated material (mostly melted material), resulting in the formation of chiral metal nanoneedles. The chirality of these nanoneedles could be controlled by just changing the sign of the helicity of the optical vortex. The tip curvature of these chiral nanoneedles was measured to be <40 nm, which is less than 1/25th of the laser wavelength (1064 nm). Such chiral metal nanoneedles will enable us to selectively distinguish the chirality and optical activity of molecules and chemical composites on a nanoscale and they will provide chiral selectivity for nanoscale imaging systems (e.g., atomic force microscopes), chemical reactions on plasmonic nanostructures, and planar metamaterials.
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