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

  Articoli su Riviste JCR/ISI  (anno 2017)

Autori:  Galal H., Agio M

Affiliazione Autori:  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

Riassunto:  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.

Rivista/Giornale:  OPTICAL MATERIALS EXPRESS
Volume n.:  7 (5)      Pagine da: 1634  a: 1646
Parole chiave: Optical materials - Detectors - Sources - Surface plasmons - Theory and design
DOI: 10.1364/OME.7.001634


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