Investigation of Nanoantenna Geometries for Maximum Field Enhancements at Optical Frequencies

Date

2017-05-25

Author

Ustun, E.
Eroglu, O.
Gür, Uğur Meriç
Ergül, Özgür Salih

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

114
views

0
downloads

We present a comparative study of nanoantennas for maximum power enhancements at their feed gaps. Due to frequency-dependent plasmonic properties of metals at optical frequencies, removing the frequency-size relationship used in perfectly conducting models, two-dimensional analysis involving both frequency and geometric scaling is performed to accurately assess the performances of different geometries. Computationally intensive simulations involving thousands of full-wave solutions are carried out by employing surface integral equations and the multilevel fast multipole algorithm. Tens of different structures, which demonstrate diverse enhancement properties, are considered and compared with each other. Numerical simulations show favorable properties of different geometries depending on the range of the optical frequency.

Subject Keywords

Plasmonic nanoantennas, Bowtie nanoantenna, Antennas, Light

URI

https://hdl.handle.net/11511/55300

Collections

Department of Electrical and Electronics Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Computational Demonstration of Multiband Nanoantennas for Power Enhancement Gür, Uğur Meriç; Ustun, Emre; Eroglu, Omer; Dikmen, Fatih; Ergül, Özgür Salih (2017-07-14) We present multiband nanoantennas that can provide large enhancement factors at multiple frequencies in the optical spectrum. The structures are obtained by opening slits on the conventional bowtie designs. Since frequency/geometry scaling is not valid due to plasmonic properties of metals, two dimensional scans are performed using a rigorous solver based on surface integral equations and method of moments. The results demonstrate the feasibility of nanoantennas with multiband characteristics that can be us...
Computational design of nanoantennas with improved power enhancement capabilities via shape optimization Işiklar, Göktuǧ; Yazar, Şirin; İbili, Hande; Onay, Gülten; El Ahdab, Zeina; Ergül, Özgür Salih (2023-01-01) Computational design and analyses of nanoantennas obtained via surface shape optimization are presented. Starting with a kernel geometry, free deformations are applied on selected surfaces to reach optimal designs that can provide improved power enhancement capabilities at desired frequencies. An in-house implementation of genetic algorithms is efficiently combined with the multilevel fast multipole algorithm developed for accurate solutions of plasmonic problems to construct the effective optimization envi...
Investigation of Alternative Array Configurations of Nanowires for Maximum Power Transmission at Optical Frequencies Karaosmanoglu, Bariscan; Satana, Hasan Aykut; Dikmen, Fatih; Ergül, Özgür Salih (2017-07-14) We present a computational analysis and comparison of nanowire arrays for efficient transmission of electromagnetic power at optical frequencies. A reliable simulation environment involving the multilevel fast multipole algorithm for fast iterative solutions of surface integral equations is used to accurately compute field intensity and power density values in the vicinity of nanowires in diverse configurations. The results demonstrate favorable properties of honeycomb structures that can provide efficient ...
Development of a pressure-based solver for both incompressible and compressible flows Denk, Kerem; Sert, Cüneyt; Department of Mechanical Engineering (2007) The aim of this study is to develop a two-dimensional pressure-based Navier-Stokes solver for incompressible/compressible flows. Main variables are Cartesian velocity components, pressure and temperature while density is linked to pressure via equation of state. Modified SIMPLE algorithm is used to achieve pressure-velocity coupling. Finite Volume discretisation is performed on non-orthogonal and boundary-fitted grids. Collocated variable arrangement is preferred because of its advantage on staggered arrang...
Analysis of correlated circular and extremal data with a flexible cylindrical distribution Kalaylıoğlu Akyıldız, Zeynep Işıl (2021-08-01) In this article, we introduce a flexible cylindrical distribution for modeling and analysis of dependent extremal and directional observations. The distribution can be used to investigate the connection between two related phenomena, such as the daily fastest wind speed and its direction. The proposed model is applicable for the analysis of a wide variety of cylindrical data, including datasets with asymmetrically distributed directional observations. The model enjoys the advantages of interpretable model p...

Citation Formats

E. Ustun, O. Eroglu, U. M. Gür, and Ö. S. Ergül, “Investigation of Nanoantenna Geometries for Maximum Field Enhancements at Optical Frequencies,” 2017, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/55300.