We apply femtosecond laser direct writing in photopolymers for manufacturing of conical microlenses and closely packed arrays thereof. We demonstrate the fabrication of high optical quality axicons of 15 µm in radius, having 150°, 160°, and 170° cone angles. Their optical properties and performance are modeled using the finite-difference time-domain method and compared with experimentally measured data. Additionally, optimization of the laser direct writing parameters regarding these types of micro-objects is presented. Possible applications of closely packed arrays of axicon microlenses are discussed, having potential attractivity in the fields of modern microscopy, light-based material processing, particle manipulation in microfluidic, and optofluidic applications.
© 2012 Optical Society of America
Original Manuscript: February 3, 2012
Revised Manuscript: May 23, 2012
Manuscript Accepted: June 1, 2012
Published: July 11, 2012
Vol. 7, Iss. 9 Virtual Journal for Biomedical Optics
Albertas Žukauskas, Mangirdas Malinauskas, Carsten Reinhardt, Boris N. Chichkov, and Roaldas Gadonas, "Closely packed hexagonal conical microlens array fabricated by direct laser photopolymerization," Appl. Opt. 51, 4995-5003 (2012)