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Intense Bessel-like beams arising from pyramid-shaped microtips

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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Submitted on : Wednesday, November 20, 2019 - 4:02:30 PM
Last modification on : Tuesday, October 6, 2020 - 4:26:41 PM

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Jérôme Martin, Julien Proust, Davy Gérard, Jean-Louis Bijeon, Jerome Plain. Intense Bessel-like beams arising from pyramid-shaped microtips. Optics Letters, Optical Society of America - OSA Publishing, 2012, 37 (7), pp.1274. ⟨10.1364/OL.37.001274⟩. ⟨hal-02372825⟩

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