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In recent years, miniaturization and light weightedness are required for industrial products as well as high functionality. Thin plates are appropriate in terms of weight, however they are usually difficult to produce only by cutting operation due to the deformation by cutting force or vibration of the thin plate. This study deals with the machining of a twisted thin plate, whose height, width and...
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.
Metal microneedles have been attractive in many fields including nano-scopic imagers, energy-saving field emission displays, and biomedical nano-electro mechanical systems. Several methods for fabrication of metal microneedles have been proposed. However, they involve mostly a bottom-up technique based on several chemical processes, and their time and cost efficiencies are limited. In recent years,...
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