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.A. (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