Computational Design and Analysis of Efficient Couplers for Nano-optical Links

Altinoklu, A.
Ergül, Özgür Salih
We present rigorous optimization and design of efficient couplers to improve optical transmission along nanowires. It is well-known that nanowires are excellent tools to transmit electromagnetic power in nano-optical systems, while couplers become inevitable at critical locations, particularly in input/output regions and at corners if nanowires are bended. We use genetic algorithms supported by fast full-wave solutions to efficiently and accurately obtain effective couplers in alternative scenarios. The designed couplers are investigated in detail, such as in terms of grid size and frequency, while we consider various cases of nanowire configurations. Usage of multiple couplers and their integration on the same transmission lines are also studied. The results are interpreted to reach conclusions and guidelines on the design of effective couplers for complex nanowire networks and nano-optical links.
PhotonIcs and Electromagnetics Research Symposium - Spring (PIERS-Spring)


Computational Design of Optical Couplers for Bended Nanowire Transmission Lines
Tuncyurek, Yunus Emre; Karaosmanoglu, Bariscan; Ergül, Özgür Salih (2017-07-01)
We present computational analysis, optimization, and design of optical couplers that can be useful to improve the transmission along bended nanowires. After demonstrating the deteriorated energy transmission due to sharp bends, which lead to out-of-phase nanowires and diffraction, we use a rigorous simulation environment to design efficient couplers made of spherical particles. For this purpose, an optimization module based on genetic algorithms is combined with the multilevel fast multipole algorithm, lead...
Design, optimization, and analyses of nano-optical couplers consisting of nanocubes to construct efficient nanowire transmission systems
Altınoklu, Aşkın; Ergül, Özgür Salih (2021-01-01)
We present the design, optimization, and analyses of efficient couplers to construct nano-optical transmission systems involving nanowires. The couplers consist of optimized arrangements of nanocubes and are integrated into critical locations, such as nanowire inputs, corners, and junctions, to improve electromagnetic transmission in accordance with design purposes. Optimization and numerical analyses are performed by employing an efficient simulation environment based on a full-wave solver and genetic algo...
Design and performance analysis of a pump-turbine system using computational fluid dynamics
Yıldız, Mehmet; Albayrak, Kahraman; Çelebioğlu, Kutay; Department of Mechanical Engineering (2011)
In this thesis, a parametric methodology is investigated to design a Pump-Turbine system using Computational Fluid Dynamics ( CFD ). The parts of Pump-Turbine are created parametrically according to the experience curves and theoretical design methods. Then, these parts are modified to obtain 500 kW turbine working as a pump with 28.15 meters head. The final design of Pump-Turbine parts are obtained by adjusting parameters according to the results of the CFD simulations. The designed parts of the Pump-Turbi...
Numerical Investigation of Nano-Cavities for Optimal Power Absorption in Solar Cells
Karaosmanoglu, Bariscan; Topcuoglu, Ulas; Tuygar, Emre; Ergül, Özgür Salih (2018-06-01)
We present a numerical study of nano-cavities used in solar cells for energy harvesting, by employing surface integral equations based on Maxwell's equations in the frequency domain and an efficient solver based on the multilevel fast multipole algorithm (MLFMA). With the three-dimensional modeling of surfaces, we obtain accurate results to evaluate the performances of different structures for improved power absorption in solar cells. This paper includes a brief description of the developed solver and initi...
Dynamic modelling and simulation of a wind turbine
Altuğ, Ayşe Hazal; Yavrucuk, İlkay; Department of Aerospace Engineering (2015)
In this thesis, a dynamic model for a horizontal axis wind turbine is developed for an upwind configuration using the MATLAB/Simulink environment. Blade Element Momentum Theory is used to model the rotor. It is assumed that the rotor blades are rigid and wind speed is uniform. Aerodynamic and gravitational forces are calculated as distributed loads. Verification of the model is done by using the LMS Samtech, Samcef for Wind Turbines software. Aerodynamic properties of the blades, sectional loads and moments...
Citation Formats
A. Altinoklu and Ö. S. Ergül, “Computational Design and Analysis of Efficient Couplers for Nano-optical Links,” presented at the PhotonIcs and Electromagnetics Research Symposium - Spring (PIERS-Spring), Rome, ITALY, 2019, Accessed: 00, 2020. [Online]. Available: