Nanophotonics

Highly-directive polymeric quasicrystalline antenna

A. A. Chuev^a, V. A. Chistyakov^a, A. A. Dudnikova^a, A. D. Sayanskii^a, M. S. Sidorenko^a, M. V. Rybin<sup>ab

a</sup> St. Petersburg National Research University of Information Technologies, Mechanics and Optics
^b Ioffe Institute, St. Petersburg

Abstract: The development of optical antennas is a critical challenge in modern photonics. Contemporary technological capabilities for fabricating such elements impose several constraints, including planar modulation of dielectric permittivity. Additionally, it is desirable to use low-absorption materials with a low refractive index. This study presents the results of the design and investigation of dielectric nanoantennas based on low-contrast quasicrystalline structures, which enable the formation of a radiation pattern from a dipole source. The material distribution within the structure is determined using an inverse design method and computational optimization to achieve the maximum gain coefficient. Theoretical analysis of the optimized optical antenna properties demonstrates a radiation gain of up to 10 dBi when using materials with a refractive index of 1.48.

Keywords: quasicrystalline photonic structure, inverse design method, optical antennas, high directivity, low-refractive-index materials.

Received: 22.04.2025
Revised: 28.04.2025
Accepted: 29.04.2025

DOI: 10.61011/OS.2025.07.61110.7861-25

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