A broadband polarization-insensitive diffractive lens design for subwavelength focusing of light

Bumin K. Yildirim, Emre Bor, Hamza Kurt, Mirbek Turduev*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

8 Scopus citations

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.

Original languageEnglish (US)
Title of host publication21st International Conference on Transparent Optical Networks, ICTON 2019
PublisherIEEE Computer Society
ISBN (Electronic)9781728127798
DOIs
StatePublished - Jul 2019
Event21st International Conference on Transparent Optical Networks, ICTON 2019 - Angers, France
Duration: Jul 9 2019Jul 13 2019

Publication series

NameInternational Conference on Transparent Optical Networks
Volume2019-July
ISSN (Electronic)2162-7339

Conference

Conference21st International Conference on Transparent Optical Networks, ICTON 2019
Country/TerritoryFrance
CityAngers
Period07/9/1907/13/19

Bibliographical note

Funding Information:
This work was supported by the Scientific and Technological Research Council of Turkey (TUBITAK) under Project No. 116F182. H.K. acknowledges partial support from the Turkish Academy of Sciences.

Publisher Copyright:
© 2019 IEEE.

Keywords

  • Diffractive lens
  • Microwaves
  • Optimization
  • Polarization-insensitive
  • Subwavelength focusing

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

Fingerprint

Dive into the research topics of 'A broadband polarization-insensitive diffractive lens design for subwavelength focusing of light'. Together they form a unique fingerprint.

Cite this