Intense Bessel-like beams arising from pyramid-shaped microtips |
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Authors: | Martin Jérôme Proust Julien Gérard Davy Bijeon Jean-Louis Plain Jérôme |
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Institution: | Laboratoire de Nanotechnologie et d’Instrumentation Optique, CNRS (UMR 6279 STMR), Université de Technologie de Troyes, 10010 Troyes, France. |
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Abstract: | We show both numerically and experimentally that intense, narrow, and low-divergence beams of light are produced at the apex of dielectric pyramid-shaped microtips. These beams exhibit a Bessel transverse profile but are narrower than the usual Bessel beam, allowing for a significant enhancement of the light intensity inside the beam. They are generated by axicon-like structures with submicrometric height imprinted in glass by combining optical lithography and chemical etching. The resulting beams are experimentally imaged using fluorescence microscopy, in remarkable agreement with numerical computations. |
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