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 - CHAP A1 - Gregersen, Niels A1 - Rosenkrantz de Lasson, Jakob A1 - Hagedorn Frandsen, Lars A1 - Häyrynen, Teppo A1 - Lavrinenko, Andrei A1 - Moerk, Jesper A1 - Wang, Fengwen A1 - Sigmund, Ole A1 - Kim, Oleksiy S. A1 - Breinbjerg, Olav A1 - Ivinskaya, Aliaksandra A1 - Gutsche, Philipp A1 - Burger, Sven T1 - Benchmarking five computational methods for analyzing large photonic crystal membrane cavities T2 - Numerical Simulation of Optoelectronic Devices (NUSOD) Y1 - 2017 U6 - https://doi.org/10.1109/NUSOD.2017.8010005 SP - 89 ER - TY - CHAP A1 - Novitsky, Andrey A1 - Rosenkrantz de Lasson, Jakob A1 - Hagedorn Frandsen, Lars 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 A1 - Mørk, Jesper A1 - Gregersen, Niels T1 - Comparison of five computational methods for computing Q factors in photonic crystal membrane cavities T2 - 19th International Conference on Transparent Optical Networks (ICTON) Y1 - 2017 U6 - https://doi.org/10.1109/ICTON.2017.8024813 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 - GEN A1 - Gutsche, Philipp A1 - Poulikakos, Lisa A1 - Burger, Sven A1 - Hammerschmidt, Martin A1 - Schmidt, Frank T1 - Optical chirality: conservation law in arbitrary space T2 - 606. WE-Heraeus-Seminar on Nanophotonics and Complex Spatial Modes of Light N2 - The introduction of the near-field quantity of optical chirality has emerged in various numerical and few experimental studies of local chirality enhancement due to its relation to the excitation rate of chiral molecules. This time-even pseudoscalar has been dismissed as being a higher-order version of helicity. Nevertheless, we revisit the derivation of the underlying conservation law and define optical chirality in media similar to. We identify the mechanism of chirality conversion by either inhomogeneous or anisotropic space to complement the conservation of optical chirality. The conservation law of optical chirality in arbitrary space enables the extension of the concept of polarization to the near-field where no distiniguished propagation direction of light is present. We show that the connection of electromagnetic energy and optical chirality provide the ability to define a circular polarization basis in time-harmonic near-field analysis. In order to illustrate our theory, we present electromagnetic field simulations of simple as well as more complex nanostructures. Results using the well-known far-field polarization concept are readily reproduced and extended from the point of view of chirality conversion. Y1 - 2016 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 - TY - GEN A1 - Gutsche, Philipp A1 - Läuter, Matthias A1 - Schmidt, Frank T1 - Parameter-dependent Parallel Block Sparse Arnoldi and Döhler Algorithms on Distributed Systems N2 - We summarize the basics and first results of the analyses within our ZIB Bridge Project and give an outlook on further studies broadening the usage of hardware acceleration within the Finite Element Method (FEM) based solution of Maxwell’s equations. T3 - ZIB-Report - 16-15 KW - Generalized Eigenvalue Problem KW - Many Integrated Core Coprocessor (MIC) KW - Finite Element Method Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-58202 SN - 1438-0064 ER - TY - CHAP A1 - Gregersen, Niels A1 - de Lasson, Jakob Rosenkrantz A1 - Frandsen, Lars Hagedorn A1 - Kim, Oleksiy S. A1 - Breinbjerg, Olav A1 - Wang, Fengwen A1 - Sigmund, Ole A1 - Ivinskaya, Aliaksandra A1 - Lavrinenko, Andrei A1 - Gutsche, Philipp A1 - Burger, Sven A1 - Häyrynen, Teppo A1 - Merk, Jesper T1 - Comparison of five numerical methods for computing quality factors and resonance wavelengths in photonic crystal membrane cavities T2 - CLEO/Europe-EQEC Y1 - 2017 U6 - https://doi.org/10.1109/CLEOE-EQEC.2017.8087750 ER -