TY - JOUR A1 - Graf, Florian A1 - Feis, Joshua A1 - Santiago, Xavier Garcia A1 - Wegener, Martin A1 - Rockstuhl, Carsten A1 - Fernandez-Corbaton, Ivan T1 - Achiral, Helicity Preserving, and Resonant Structures for Enhanced Sensing of Chiral Molecules JF - ACS Photonics Y1 - 2019 U6 - https://doi.org/10.1021/acsphotonics.8b01454 VL - 6 SP - 482 ER - TY - JOUR A1 - Schneider, Philipp-Immanuel A1 - Santiago, Xavier Garcia A1 - Soltwisch, Victor A1 - Hammerschmidt, Martin A1 - Burger, Sven A1 - Rockstuhl, Carsten T1 - Benchmarking five global optimization approaches for nano-optical shape optimization and parameter reconstruction JF - ACS Photonics Y1 - 2019 U6 - https://doi.org/10.1021/acsphotonics.9b00706 VL - 6 SP - 2726 ER - TY - JOUR A1 - Abass, Aimi A1 - Gutsche, Philipp A1 - Maes, Bjorn A1 - Rockstuhl, Carsten A1 - Martins, Emiliano R T1 - Insights into directional scattering: from coupled dipoles to asymmetric dimer nanoantennas JF - Opt. Express N2 - Strong and directionally specific forward scattering from optical nanoantennas is of utmost importance for various applications in the broader context of photovoltaics and integrated light sources. Here, we outline a simple yet powerful design principle to perceive a nanoantenna that provides directional scattering into a higher index substrate based on the interference of multiple electric dipoles. A structural implementation of the electric dipole distribution is possible using plasmonic nanoparticles with a fairly simple geometry, i.e. two coupled rectangular nanoparticles, forming a dimer, on top of a substrate. The key to achieve directionality is to choose a sufficiently large size for the nanoparticles. This promotes the excitation of vertical electric dipole moments due to the bi-anisotropy of the nanoantenna. In turn, asymmetric scattering is obtained by ensuring the appropriate phase relation between the vertical electric dipole moments. The scattering strength and angular spread for an optimized nanoantenna can be shown to be broadband and robust against changes in the incidence angle. The scattering directionality is maintained even for an array configuration of the dimer. It only requires the preferred scattering direction of the isolated nanoantenna not to be prohibited by interference. Y1 - 2016 U6 - https://doi.org/10.1364/OE.24.019638 VL - 24 IS - 17 SP - 19638 EP - 19650 ER - TY - JOUR A1 - Santiago, Xavier Garcia A1 - Hammerschmidt, Martin A1 - Burger, Sven A1 - Rockstuhl, Carsten A1 - Fernandez-Corbaton, Ivan A1 - Zschiedrich, Lin T1 - Decomposition of scattered electromagnetic fields into vector spherical wave functions on surfaces with general shapes JF - Phys. Rev. B Y1 - 2019 U6 - https://doi.org/10.1103/PhysRevB.99.045406 VL - 99 SP - 045406 ER -