Microphotonic parabolic light directors fabricated by two-photon lithography

Creators: Atwater, J. H.; Spinelli, P.; Kosten, E.; Parsons, J.; Van Lare, C.; Van de Groep, J.; Garcia de Abajo, J.; Polman, A.; Atwater, H. A.

Abstract

We have fabricated microphotonic parabolic light directors using two-photon lithography, thin-film processing, and aperture formation by focused ion beam lithography. Optical transmission measurements through upright parabolic directors 22 μm high and 10 μm in diameter exhibit strong beam directivity with a beam divergence of 5.6°, in reasonable agreement with ray-tracing and full-field electromagnetic simulations. The results indicate the suitability of microphotonic parabolic light directors for producing collimated beams for applications in advanced solar cell and light-emitting diode designs.

Additional Information

© 2011 American Institute of Physics. Received 8 August 2011; accepted 20 September 2011; published online 13 October 2011. The authors are grateful for technical assistance from G. Vollenbroek and M. Vrucinic. The Caltech researchers are supported by the Light-Matter Interactions Energy Frontier Research Center, an EFRC program of the Office of Science, United States Department of Energy under Grant No. DESC0001293 (EDK and HAA). Researchers of the Center for Nanophotonics at AMOLF are supported by the research program of FOM which is financially supported by NWO.

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