Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 58: Poster: Quantum Optics and Photonics III
Q 58.18: Poster
Donnerstag, 14. März 2019, 16:15–18:15, S Atrium Informatik
Geometry optimization for Casimir-Polder calculations using the discontinuous Galerkin time domain method — •Bettina Beverungen1, Philip Kristensen1, and Kurt Busch1,2 — 1Humboldt-Universität zu Berlin, Institut für Physik, AG Theoretische Optik & Photonik, Newtonstr. 15, 12489 Berlin, Germany — 2Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Str. 2A, 12489 Berlin, Germany
Many properties of light-matter interaction depend on the geometry of the system to be analyzed and might exhibit improved performance for nontrivially shaped structures. These kinds of problems are typically not analytically tractable and involve large parameter spaces, therefore lending themselves to black box optimization methods, which do not require knowledge of the objective function's explicit functional form. In this work, we implemented a genetic algorithm for geometry optimization of nanophotonic structures simulated via the discontinuous Galerkin time domain (DGTD) method.
We employ the genetic algorithm in combination with a numerical DGTD calculation of Casimir-Polder forces for arbitrarily shaped objects. These forces are typically attractive, as in the case of a small polarizable particle interacting with a plate. However, specialized geometries can lead to the introduction of repulsive forces under particular circumstances. As an example application, we explore the use of complex geometrical shapes to increase the repulsive force.