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Title: Design and analysis of all-dielectric subwavelength focusing flat lens
Authors: Turduev, Mirbek
 Bor, E.
 Kurt, Hamza
Keywords: Multiplexing
mode converter
Issue Date: Aug-2017
Publisher: Institute Of Physics Publishing
Source: Turduev, M., Bor, E., & Kurt, H. (2017). Design and analysis of all-dielectric subwavelength focusing flat lens. Journal of Physics D: Applied Physics, 50(38), 38LT02.
Abstract: In this letter, we numerically designed and experimentally demonstrated a compact photonic structure for the subwavelength focusingof light using all-dielectric absorption-free and nonmagnetic scattering objects distributed in an air medium. In order to design the subwavelength focusing flat lens, an evolutionary algorithm is combined with the finite-difference time-domain method for determining the locations of cylindrical scatterers. During the multi-objective optimization process, a specific objective function is defined to reduce the full width at half maximum (FWHM) and diminish side lobe level (SLL) values of light at the focal point. The time-domain response of the optimized flat lens exhibits subwavelength light focusing with an FWHM value of 0.19? and an SLL value of 0.23, where ? denotes the operating wavelength of light. Experimental analysis of the proposed flat lens is conducted in a microwave regime and findings exactly verify the numerical results with an FWHM of 0.192? and an SLL value of 0.311 at the operating frequency of 5.42 GHz. Moreover, the designed flat lens provides a broadband subwavelength focusing effect with a 9% bandwidth covering frequency range of 5.10 GHz-5.58 GHz, where corresponding FWHM values remain under 0.21?. Also, it is important to note that the designed flat lens structure performs a line focusing effect. Possible applications of the designed structure in telecom wavelengths are speculated upon for future perspectives. Namely, the designed structure can perform well in photonic integrated circuits for different fields of applications such as high efficiency light coupling, imaging and optical microscopy, with its compact size and ability for strong focusing. © 2017 IOP Publishing Ltd.
ISSN: 223727
Appears in Collections:Elektrik ve Elektronik Mühendisliği Bölümü / Department of Electrical & Electronics Engineering
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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