Full Wave Analysis of Three Dimensional Optical Metamaterials Involving DeformedNanowires

Karaosmanoglu, Barıscan
Yılmaz, Akıf
Ergül, Özgür Salih


Full-Wave Electromagnetic Optimisation of Corrugated Metallic Reectors Using a Multigrid Approach
KARAOVA, Gokhan; ALTINOKLU, Askin; Ergül, Özgür Salih (2018-01-19)
A multigrid optimisation strategy is introduced to design passive metallic reflectors with corrugated shapes. The strategy is based on using genetic algorithms at multiple grids and shaping the metal sheets, starting from coarse details to fine tunings. This corresponds to a systematic expansion of the related optimisation space, which is explored more efficiently in comparison to a brute-force optimisation without using grid. By employing the multilevel fast multipole algorithm to analyse the electromagnet...
Full wave electromagnetic optimizations using surface integral equations and the multilevel fast multipole algorithm
We present an electromagnetic optimization environment based on full-wave solutions via surface integral equations and the multilevel fast multipole algorithm (MLFMA). Optimizations are performed by using genetic algorithms, while the required trials are performed accurately via MLFMA. The developed mechanism can handle many different operations, such as portion moving/removing, rotation, and gap opening, that have different effects in the constructed matrix equations but that can efficiently be executed in...
Full-Wave Electromagnetic Optimizations of Corrugated Metallic Sheets
Altinoklu, Askin; Karaosmanoglu, Bariscan; Ergül, Özgür Salih (2016-07-01)
We present optimizations of corrugated metallic sheets for desired electromagnetic responses. Patches of finite extents are considered and deformed to achieve the required characteristics. Optimizations are performed by using genetic algorithms (GAs), while the required accurate solutions are performed via the multilevel fast multipole algorithm. In addition to improvements in GAs, the optimization environment is enhanced by using dynamic accuracy control and adaptive mesh refinement to handle thousands of ...
Full Anelastic Waveform Tomography Including Model Uncertainty
Askan Gündoğan, Ayşegül (2008-12-01)
This article is concerned with the problem of seismic inversion in the presence of model uncertainty. In a recent article (Askan et al., 2007), we described an inverse adjoint anelastic wave propagation algorithm for determining the crustal velocity and attenuation properties of basins in earthquake-prone regions. We formulated the tomography problem as a constrained optimization problem where the constraints are the partial and the ordinary differential equations that govern the anelastic wave propagation ...
Full-wave Electromagnetic Optimizations of Photonic Crystals Involving Dielectric Rods
Eray, H.; Karaosmanoglu, B.; Ergül, Özgür Salih (2017-11-22)
We consider full-wave optimizations of photonic crystals (PhCs) involving dielectric rods to obtain desired output patterns for given excitations. Starting from a full grid, each rod is kept or extracted in order to maximize the power density at different output locations. PhCs are modeled as three-dimensional structures, which are analyzed via surface integral equations and the multilevel fast multipole algorithm, in order to investigate realistic problems without resorting to infinite-length assumptions. ...
Citation Formats
B. Karaosmanoglu, A. Yılmaz, and Ö. S. Ergül, “Full Wave Analysis of Three Dimensional Optical Metamaterials Involving DeformedNanowires,” 2015, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/76857.