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.
© 2012 Optical Society of America
Original Manuscript: January 9, 2012
Revised Manuscript: February 16, 2012
Manuscript Accepted: February 16, 2012
Published: March 30, 2012
Vol. 7, Iss. 6 Virtual Journal for Biomedical Optics
Jérôme Martin, Julien Proust, Davy Gérard, Jean-Louis Bijeon, and Jérôme Plain, "Intense Bessel-like beams arising from pyramid-shaped microtips," Opt. Lett. 37, 1274-1276 (2012)