Design and Analysis of All-dielectric Subwavelength Focusing Flat Lens

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dc.contributor.author Turduev, M.
dc.contributor.author Bor, E.
dc.contributor.author Kurt, H.
dc.date.accessioned 2019-06-26T12:34:18Z
dc.date.available 2019-06-26T12:34:18Z
dc.date.issued 2017
dc.identifier.issn 0022-3727
dc.identifier.issn 1361-6463
dc.identifier.uri https://doi.org/10.1088/1361-6463/aa805a
dc.identifier.uri https://acikerisim.tedu.edu.tr/xmlui/handle/20.500.12485/197
dc.description.abstract In this letter, we numerically designed and experimentally demonstrated a compact photonic structure for the subwavelength focusing of 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 lambda 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 lambda 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 lambda. 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. en_US
dc.description.sponsorship Scientific and Technological Research Council of Turkey (TUBITAK) Turkish Academy of Sciences en_US
dc.language.iso en en_US
dc.subject Physics en_US
dc.title Design and Analysis of All-dielectric Subwavelength Focusing Flat Lens en_US
dc.type Article en_US
dc.relation.journal Journal of Physics D: Applied Physics
dc.contributor.authorID 0000-0002-3334-0808
dc.identifier.issue 38
dc.identifier.startpage 1
dc.identifier.endpage 5
dc.identifier.volume 50

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