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Title: A broadband polarization-insensitive diffractive lens design for subwavelength focusing of light
Authors: Yıldırım, Bumin K.
Bor, Emre
Kurt, Hamza
Turduev, Mirbek
Keywords: Lenses
integrated optics
optical polarization
broadband communication
finite difference methods
Issue Date: 2019
Publisher: IEEE Computer Society
Source: Yildirim, B. K., Bor, E., Kurt, H., and Turduev, M. (2019, July). A Broadband Polarization-Insensitive Diffractive Lens Design for Subwavelength Focusing of Light. In 2019 21st International Conference on Transparent Optical Networks (ICTON) (pp. 1-4). IEEE.
Series/Report no.: International Conference on Transparent Optical Networks
Abstract: In this study, we propose the metaheuristic design of a polarization-insensitive diffractive lens. The designed lens structure consists of concentric dielectric rings with optimally modulated widths and heights. Here, the evolutionary optimization approach is conducted to find the optimum values of concentric rings' widths and heights to obtain polarization-insensitive subwavelength focusing effect of the incident light. Three-dimensional finite-difference time-domain (3D FDTD) method is incorporated with the optimization algorithm to evaluate the focusing ability of instantly designed lens structures throughout the optimization process. The presented lens structure is designed at operating frequency of 10 GHz, and has a diameter of 18.45 cm with thickness of 2.4 cm. The detailed analysis of the polarization-insensitive focusing effect of designed diffractive flat lens is numerically investigated at microwave frequency regime considering the scenario of experimental verification to be conducted at the same spectral region. Possible experimental verifications are discussed along with the 3D-printing of the designed lens structure. As a further step, the presented design concept may be applied to design metasurfaces operating at visible wavelengths. © 2019 IEEE.
ISBN: 978-172812779-8
ISSN: 21627339
Appears in Collections:Elektrik ve Elektronik Mühendisliği Bölümü / Department of Electrical & Electronics Engineering
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

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