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.

Appl. Phys. Lett.
Photonic Materials

Atwater, J. H., Spinelli, P., Kosten, E. D., Parsons, J., van Lare, M. C., van de Groep, J., … Atwater, H. (2011). Microphotonic parabolic light directors fabricated by two-photon lithography. Appl. Phys. Lett., 99(15, Article number: 151113), 1–3. doi:10.1063/1.3648115