Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 48: Focus Session (with O): Nanophotonic concepts and materials for energy harvesting - Plasmonics, transformation optics, upconversion, and beyond I

HL 48.1: Hauptvortrag

Mittwoch, 18. März 2015, 11:00–11:30, EW 201

Transformation Optics: From Fundamentals to Applications for Energy Harvesting — •Martin Wegener and Martin Schumann — Institute of Applied Physics and Institute of Nanotechnology, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany

Transformation optics can be seen as a versatile tool for designing devices in optics and other areas of physics. In this talk, we start by giving a broad introduction into this concept. A striking paradigm is invisibility cloaking. We briefly review experimental demonstrations in optics, thermodynamics, and mechanics. Next, we discuss a possible application: In order to extract the electrical power from solar cells, metal contacts at the sun-facing surface are required. Unfortunately, these contacts create optically dead areas, reducing the overall current per area by a few percent. We present a solution to this problem by using microstructures that are designed by transformation optics and that cloak the contacts. An experimental proof-of-principle demonstration based on three-dimensional direct-laser-writing optical laser lithography is given.