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We discovered that a nanosecond optical vortex pulse can create a chiral cone‐shaped monocrystalline silicon (Si) nanostructure (chiral Si nanocone) by transferring its optical angular momentum to a monocrystalline Si substrate. The fabricated Si nanocone, with a length of 4.8 µm and a tip curvature of ∼110 nm, was fully monocrystalline, and it had a spiral structure with an 86 nm line width on a...
We for the first time demonstrated a chiral mono-crystalline cone-shaped silicon structure (chiral Si nano-cone). It was fabricated on a nano-scale by transferring the optical angular momentum of optical vortex to a mono-crystalline Si substrate.
Optical vortices, having an orbital angular momentum due to a helical wavefront, have been intensely employed in various fields, including optical trapping, optical tweezers and spanners for microstructures. Recently, we demonstrated the formation of twisted (chiral) metal nanoneedles by the deposition of optical vortex pulses, in which the orbital angular momentum of the optical vortex is transferred...
We discovered that chiral-structure of nano-needles fabricated by optical vortex laser ablation can be controlled by changing the magnitude of orbital angular momentum. We also demonstrated the formation of a chiral Si-bump.
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