We report and analyze experimental observation of the formation of a narrow, well collimated laser beam at optical frequency behind the woodpile photonic crystal fabricated using a femtosecond laser multi-photon polymerization technique. We show that the collimation depends on the input laser beam focusing conditions. We discuss the experimental results and give theoretical interpretation.
Proceedings of SPIE: proceedings of the Photonic Crystal Materials and Devices X Conference, Brussels, Belgium, 16-19 April 2012 / Hernan Ruy Miguez, Sergei G. Romanov, Lucio Claudio Andreani and Christian Seassal (eds.),
Vol. 8425, paper no. 842511
The authors acknowledge support from the Spanish Ministerio de Ciencia e Innovacion and European Union FEDER through projects FIS2008-06024-C03-C02, and FIS2011 29731-C02-01, the EC Seventh Framework Programme LASERLAB-EUROPE (grant agreements no. 228334), and the European Union Structural Funds project 'Postdoctoral Fellowship Implementation in Lithuania'.