Semiconductor Physics, Quantum Electronics & Optoelectronics, 27 (1), P. 109-116 (2024).
DOI: https://doi.org/10.15407/spqeo27.01.109
Numerical study of single-layer and interlayer grating polarizers based on metasurface structures for quantum key distribution systems
Institute of Laser for Postgraduate Studies, University of Baghdad, Al-Jadyriah, 10070, Baghdad, Iraq Abstract.
Polarization is an important property of light, which refers to the direction of electric field oscillations. Polarization modulation plays an essential role for polarization encoding quantum key distribution (QKD). Polarization is used to encode photons in the QKD systems. In this work, visible-range polarizers with optimal dimensions based on resonance grating waveguides have been numerically designed and investigated using the COMSOL Multiphysics Software. Two structures have been designed, namely a single-layer metasurface grating (SLMG) polarizer and an interlayer metasurface grating (ILMG) polarizer. Both structures have demonstrated high extinction ratios, ~1.8·103 and 8.68·104, and the bandwidths equal to 45 and 55 nm for the SLMG and ILMG, respectively.
Keywords:quantum cryptography, resonance grating, subwavelength grating, metasurfaces, wire grid polarizer.
A.Q. Baki, S.K. Tawfeeq*
*Corresponding author e-mail: shelan.khasro@ilps.uobaghdad.edu.iq
This work is licensed under a Creative Commons Attribution-NoDerivatives 4.0 International License.