TY - JOUR A1 - Gutsche, Philipp A1 - Santiago, Xavier Garcia A1 - Schneider, Philipp-Immanuel A1 - McPeak, Kevin A1 - Nieto-Vesperinas, Manuel A1 - Burger, Sven T1 - Role of Geometric Shape in Chiral Optics JF - Symmetry Y1 - 2020 U6 - https://doi.org/10.3390/sym12010158 VL - 12 SP - 158 ER - TY - JOUR A1 - Gutsche, Philipp A1 - Schneider, Philipp-Immanuel A1 - Burger, Sven A1 - Nieto-Vesperinas, Manuel T1 - Chiral scatterers designed by Bayesian optimization JF - J. Phys.: Conf. Ser. Y1 - 2018 U6 - https://doi.org/10.1088/1742-6596/963/1/012004 VL - 963 SP - 012004 ER - TY - JOUR A1 - Wilson, Jon A1 - Gutsche, Philipp A1 - Herrmann, Sven A1 - Burger, Sven A1 - McPeak, Kevin T1 - Correlation of circular differential optical absorption with geometric chirality in plasmonic meta-atoms JF - Opt. Express Y1 - 2019 U6 - https://doi.org/10.1364/OE.27.005097 VL - 27 SP - 5097 ER - TY - JOUR A1 - Gutsche, Philipp A1 - Mäusle, Raquel A1 - Burger, Sven T1 - Locally Enhanced and Tunable Optical Chirality in Helical Metamaterials JF - Photonics Y1 - 2016 U6 - https://doi.org/10.3390/photonics3040060 VL - 3 SP - 60 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 - Gregersen, Niels A1 - de Lasson, Jakob Rosenkrantz A1 - Frandsen, Lars Hagedorn A1 - Gutsche, Philipp A1 - Burger, Sven A1 - Kim, Oleksiy S. A1 - Breinbjerg, Olav A1 - Ivinskaya, Aliaksandra A1 - Wang, Fengwen A1 - Sigmund, Ole A1 - Häyrynen, Teppo A1 - Lavrinenko, Andrei T1 - Benchmarking state-of-the-art numerical simulation techniques for analyzing large photonic crystal membrane line defect cavities JF - Proc. SPIE Y1 - 2018 U6 - https://doi.org/10.1117/12.2304338 VL - 10672 SP - 106721C ER - TY - JOUR A1 - Gutsche, Philipp A1 - Nieto-Vesperinas, Manuel T1 - Optical Chirality of Time-Harmonic Wavefields for Classification of Scatterers JF - Sci. Rep. Y1 - 2018 U6 - https://doi.org/10.1038/s41598-018-27496-w VL - 8 SP - 9416 ER - TY - JOUR A1 - de Lasson, Jakob Rosenkrantz A1 - Frandsen, Lars Hagedorn A1 - Gutsche, Philipp A1 - Burger, Sven A1 - Kim, Oleksiy S. A1 - Breinbjerg, Olav A1 - Ivanskaya, Aliaksandra A1 - Wang, Fengwen A1 - Sigmund, Ole A1 - Häyrynen, Teppo A1 - Lavrinenko, Andrei A1 - Mork, Jesper A1 - Gregersen, Niels T1 - Benchmarking five numerical simulation techniques for computing resonance wavelengths and quality factors in photonic crystal membrane line defect cavities JF - Opt. Express Y1 - 2018 U6 - https://doi.org/10.1364/OE.26.011366 VL - 26 SP - 11366 ER - TY - JOUR A1 - Mrowinski, Paweł A1 - Schnauber, Peter A1 - Gutsche, Philipp A1 - Kaganskiy, Arsenty A1 - Schall, Johannes A1 - Burger, Sven A1 - Rodt, Sven A1 - Reitzenstein, Stephan T1 - Directional emission of a deterministically fabricated quantum dot – Bragg reflection multi-mode waveguide system JF - ACS Photonics Y1 - 2019 U6 - https://doi.org/10.1021/acsphotonics.9b00369 VL - 6 SP - 2231 ER - TY - JOUR A1 - Wolff, Christian A1 - Gutsche, Philipp A1 - Steel, Michael J. A1 - Eggleton, Benjamin J. A1 - Poulton, Christopher G. T1 - Impact of nonlinear loss on stimulated Brillouin scattering JF - J. Opt. Soc. Am. B N2 - We study the impact of two-photon absorption (2PA) and fifth-order nonlinear loss such as 2PA-induced free-carrier absorption in semiconductors on the performance of stimulated Brillouin scattering devices. We formulate the equations of motion including effective loss coefficients, whose explicit expressions are provided for numerical evaluation in any waveguide geometry. We find that 2PA results in a monotonic, algebraic relationship between amplification, waveguide length, and pump power, whereas fifth-order losses lead to a nonmonotonic relationship. We define a figure of merit for materials and waveguide designs in the presence of fifth-order losses. From this, we determine the optimal waveguide length for the case of 2PA alone and upper bounds for the total Stokes amplification for the case of 2PA as well as fifth-order losses. The analysis is performed analytically using a small-signal approximation and is compared to numerical solutions of the full nonlinear modal equations. Y1 - 2015 U6 - https://doi.org/10.1364/JOSAB.32.001968 VL - 32 IS - 9 SP - 1968 EP - 1978 ER - TY - JOUR A1 - Poulikakos, Lisa A1 - Gutsche, Philipp A1 - McPeak, Kevin A1 - Burger, Sven A1 - Niegemann, Jens A1 - Hafner, Christian A1 - Norris, David T1 - The Optical Chirality Flux as a Useful Far-Field Probe of Chiral Near Fields JF - ACS Photonics Y1 - 2016 U6 - https://doi.org/10.1021/acsphotonics.6b00201 VL - 3 SP - 1619 ER - TY - JOUR A1 - Wolff, Christian A1 - Gutsche, Philipp A1 - Steel, Michael J. A1 - Eggleton, Benjamin J. A1 - Poulton, Christopher G. T1 - Power limits and a figure of merit for stimulated Brillouin scattering in the presence of third and fifth order loss JF - Opt. Express N2 - We derive a set of design guidelines and a figure of merit to aid the engineering process of on-chip waveguides for strong Stimulated Brillouin Scattering (SBS). To this end, we examine the impact of several types of loss on the total amplification of the Stokes wave that can be achieved via SBS. We account for linear loss and nonlinear loss of third order (two-photon absorption, 2PA) and fifth order, most notably 2PA-induced free carrier absorption (FCA). From this, we derive an upper bound for the output power of continuous-wave Brillouin-lasers and show that the optimal operating conditions and maximal realisable Stokes amplification of any given waveguide structure are determined by a dimensionless parameter ℱ involving the SBS-gain and all loss parameters. We provide simple expressions for optimal pump power, waveguide length and realisable amplification and demonstrate their utility in two example systems. Notably, we find that 2PA-induced FCA is a serious limitation to SBS in silicon and germanium for wavelengths shorter than 2200nm and 3600nm, respectively. In contrast, three-photon absorption is of no practical significance. Y1 - 2015 U6 - https://doi.org/10.1364/OE.23.026628 VL - 23 IS - 20 SP - 26628 EP - 26638 ER - TY - JOUR A1 - Pomplun, Jan A1 - Burger, Sven A1 - Zschiedrich, Lin A1 - Gutsche, Philipp A1 - Schmidt, Frank T1 - Method for fast computation of angular light scattering spectra from 2D periodic arrays JF - Proc. SPIE Y1 - 2016 U6 - https://doi.org/10.1117/12.2219666 VL - 9778 SP - 977839 ER - TY - JOUR A1 - Gutsche, Philipp A1 - Poulikakos, Lisa A1 - Hammerschmidt, Martin A1 - Burger, Sven A1 - Schmidt, Frank T1 - Time-harmonic optical chirality in inhomogeneous space JF - Proc. SPIE Y1 - 2016 U6 - https://doi.org/10.1117/12.2209551 VL - 9756 SP - 97560X ER -