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A planar bilayered silver prisms with rounded corner is shown to have a singular optical mode depends of gaps by numerical simulation. Such behavior results from the plasmon resonance in the pairs of nanoprisms both the electric and the magnetic components of light.
A Bessel beam is suitable for laser micro-fabrication because it possesses both a micron-sized focal spot and a deep focal depth. As the influence of focusing aberrations is much smaller than that of a convex lens, the generation of a Bessel beam using an axicon is very practical. In the case of laser micro drilling of austenitic stainless steel with a Bessel beam, suitable processing conditions were...
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