Scientific Results

Highly efficient light extraction and directional emission from large refractive-index materials with a planar Yagi-Uda antenna

Year: 2017

Authors: Galal H., Agio M.

Autors Affiliation: Laboratory of Nano-Optics, University of Siegen, 57072 Siegen, Germany; Department of Physics, Ain Shams University, 11566 Cairo, Egypt; National Institute of Optics (INO), National Research Council (CNR), 50125 Florence, Italy

Abstract: Light emission is a basic process at the core of applications in optics and photonics, such as lighting, sensing and telecom. Despite extensive work on the design of light-matter interfaces, the outcoupling of electromagnetic radiation from nanoscale sources is still a challenge. Here, we show how a planar Yagi-Uda antenna based on thin-film optics can lead to more than 90% outcoupling efficiency and strong directional emission from materials with a large refractive index. Our findings are particularly relevant for semiconductor-based nanophotonic devices, which typically suffer from a large mismatch with respect to free-space and guided modes. (C) 2017 Optical Society of America

Journal/Review: OPTICAL MATERIALS EXPRESS

Volume: 7 (5)      Pages from: 1634  to: 1646

More Information: This work was funded by the University of Siegen.
KeyWords: Antennas; Directive antennas; Electromagnetic waves; Light; Optical films; Refractive index; Semiconductor devices; Directional emission; Free spaces; Guided modes; Light extraction; Nanophotonic devices; Out-coupling efficiency; Thin film optics; Yagi-Uda antennas; Antenna arrays
DOI: 10.1364/OME.7.001634

Citations: 7
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