Dresden 2020 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 71: Focus Session: Tailored Nonlinear Photonics II

HL 71.4: Vortrag

Donnerstag, 19. März 2020, 16:15–16:30, POT 51

ZnO-based dielectric nanoantennas for nonlinear applications — •Christian Golla, Nils Weber, Sophia Thies, Thomas Zentgraf, and Cedrik Meier — Department Physik, Universität Paderborn, 33098 Paderborn, Germany

Boosting nonlinear optical effects like second and third harmonic generation on the nanoscale is a subject of many theoretical and experimental studies. Here, plasmonic nanoantennas play an important role due to their capability of enhancing local electric fields and thus increasing the efficiency of nonlinear processes. However, intrinsic losses caused by metals limit the efficiency of such devices especially in the visible regime. In this context, nanostructures made of dielectric materials emerged as complementary candidates to plasmonic systems in recent years. These structures allow the confinement and magnification of electric and magnetic fields to subwavelength volumes based on Mie resonances. Due to the low absorption compared to metals they are considered as an alternative to overcome the limitations of plasmonic structures. In our work, zinc oxide based nanoantennas on sapphire substrates are investigated. Not only enhancement of the generation of second and third harmonic light but also the realization of a metasurface in the linear regime are demonstrated. Furthermore, preliminary results for combining the nonlinear character and the metasurface are shown.