High-efficiency light-wave control with all-dielectric optical Huygens' metasurfaces

By M. Decker, Isabelle Staude, M. Falkner, J. Dominguez, Dragomir N. Neshev, I. Brener, T. Pertsch, Yuri Kivshar. 2014

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Optical metasurfaces have developed as a breakthrough concept for advanced wavefront engineering enabled by subwavelength resonant nanostructures. However, reflection and/or absorption losses as well as low polarisation-conversion efficiencies pose a fundamental obstacle for achieving high transmission efficiencies that are required for practical applications. Here we demonstrate, for the first time to our knowledge, highly efficient all-dielectric metasurfaces for near-infrared frequencies using arrays of silicon nanodisks as meta-atoms. We employ the main features of Huygens’ sources, namely spectrally overlapping electric and magnetic dipole resonances of equal strength, to demonstrate Huygens’ metasurfaces with a full transmission-phase coverage of 360 degrees and near-unity transmission, and we confirm experimentally full phase coverage combined with high efficiency in transmission. Based on these key properties, we show that all-dielectric Huygens’ metasurfaces could become a new paradigm for flat optical devices, including beam-steering, beam-shaping, and focusing, as well as holography and dispersion control. two-photon microscope – is almost completely recompressed to the Fourier-limited initial pulse after transmission through 6 layers of our Huygens’ metasurface. This shows that Huygens’ metasurfaces can also provide remarkable dispersion-control that can be integrated in a linear beam path as an ultra-thin transmitting element. metasurface have their foundation in the resonant overlap of electric and magnetic dipole resonances of the silicon-nanodisk resonators. Our results

Subfields: Aerospace Engineering, Biomedical Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/5cae57d0d0f5ae0d2b017fbfe821b6b305b6b3fb