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|Title:||Differential evolution algorithm based photonic structure design: Numerical and experimental verification of subwavelength ? /5 focusing of light||Authors:||Bor, E.
|Issue Date:||Aug-2016||Publisher:||Nature Publishing Group||Source:||Bor, E., Turduev, M., & Kurt, H. (2016). Differential evolution algorithm based photonic structure design: numerical and experimental verification of subwavelength ?/5 focusing of light. Scientific reports, 6, 30871.||Abstract:||Photonic structure designs based on optimization algorithms provide superior properties compared to those using intuition-basedapproaches. In the present study, we numerically and experimentally demonstrate subwavelength focusing of light using wavelength scale absorption-free dielectric scattering objects embedded in an air background. An optimization algorithm based on differential evolution integrated into the finite-difference time-domain method was applied to determine the locations of each circular dielectric object with a constant radius and refractive index. The multiobjective cost function defined inside the algorithm ensures strong focusing of light with low intensity side lobes. The temporal and spectral responses of the designed compact photonic structureprovided a beam spot size in air with a full width at half maximum value of 0.19?, where ? is the wavelength of light. The experiments were carried out in the microwave region to verify numerical findings, and very good agreement between the two approaches was found. The subwavelength light focusing is associated with a strong interference effect due to nonuniformly arranged scatterers and an irregular index gradient. Improving the focusing capability of optical elements by surpassing the diffraction limit of light is of paramount importance in optical imaging, lithography, data storage, and strong light-matter interaction. © The Author(s) 2016.||URI:||https://www.nature.com/articles/srep30871
|Appears in Collections:||Elektrik ve Elektronik Mühendisliği Bölümü / Department of Electrical & Electronics Engineering|
PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection
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