Details
| Original language | English |
|---|---|
| Pages (from-to) | 19418-19441 |
| Number of pages | 24 |
| Journal | Optics express |
| Volume | 33 |
| Issue number | 9 |
| Early online date | 25 Apr 2025 |
| Publication status | Published - 5 May 2025 |
Abstract
Engineering the field scattered by an object is an important problem across the entire electromagnetic spectrum. For example, directional scattering achieved by means of nanoantennas is sought for applications in integrated optics, nanophotonics, sensing, single photon sources, and quantum information processing. Since a scattered field can be decomposed into a superposition of multipolar fields, the multipole decomposition technique provides an ideal platform for scattering engineering. In this paper, we present a topology optimization method for the inverse design of nanostructures to achieve specific multipoles with amplitude and phase control at a given wavelength. Our technique is formulated based on the discrete dipole approximation (DDA), and the optimization objective is specified as the current density associated with each multipole. Our approach operates on near-field quantities and is computationally lighter than similar methods targeting the far-field. Moreover, we can enforce a desired size/shape of the design volume, e.g., to meet fabrication or diffractionless constraints. We demonstrate our method by optimizing dielectric and metallic nanoantennas to achieve directional scattering based on the Kerker effect, using different excitation sources, including a plane wave and a dipole emitter. However, the generality of our approach makes it suitable for engineering nanoantennas with arbitrary scattering properties under various illumination conditions.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
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In: Optics express, Vol. 33, No. 9, 05.05.2025, p. 19418-19441.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Topology optimization of optical nanoantennas with desired multipoles
AU - Bahmani, Sadeq
AU - Evlyukhin, Andrey B.
AU - Hassan, Emadeldeen
AU - Calà Lesina, Antonio
N1 - Publisher Copyright: © 2025 Optica Publishing Group (formerly OSA). All rights reserved.
PY - 2025/5/5
Y1 - 2025/5/5
N2 - Engineering the field scattered by an object is an important problem across the entire electromagnetic spectrum. For example, directional scattering achieved by means of nanoantennas is sought for applications in integrated optics, nanophotonics, sensing, single photon sources, and quantum information processing. Since a scattered field can be decomposed into a superposition of multipolar fields, the multipole decomposition technique provides an ideal platform for scattering engineering. In this paper, we present a topology optimization method for the inverse design of nanostructures to achieve specific multipoles with amplitude and phase control at a given wavelength. Our technique is formulated based on the discrete dipole approximation (DDA), and the optimization objective is specified as the current density associated with each multipole. Our approach operates on near-field quantities and is computationally lighter than similar methods targeting the far-field. Moreover, we can enforce a desired size/shape of the design volume, e.g., to meet fabrication or diffractionless constraints. We demonstrate our method by optimizing dielectric and metallic nanoantennas to achieve directional scattering based on the Kerker effect, using different excitation sources, including a plane wave and a dipole emitter. However, the generality of our approach makes it suitable for engineering nanoantennas with arbitrary scattering properties under various illumination conditions.
AB - Engineering the field scattered by an object is an important problem across the entire electromagnetic spectrum. For example, directional scattering achieved by means of nanoantennas is sought for applications in integrated optics, nanophotonics, sensing, single photon sources, and quantum information processing. Since a scattered field can be decomposed into a superposition of multipolar fields, the multipole decomposition technique provides an ideal platform for scattering engineering. In this paper, we present a topology optimization method for the inverse design of nanostructures to achieve specific multipoles with amplitude and phase control at a given wavelength. Our technique is formulated based on the discrete dipole approximation (DDA), and the optimization objective is specified as the current density associated with each multipole. Our approach operates on near-field quantities and is computationally lighter than similar methods targeting the far-field. Moreover, we can enforce a desired size/shape of the design volume, e.g., to meet fabrication or diffractionless constraints. We demonstrate our method by optimizing dielectric and metallic nanoantennas to achieve directional scattering based on the Kerker effect, using different excitation sources, including a plane wave and a dipole emitter. However, the generality of our approach makes it suitable for engineering nanoantennas with arbitrary scattering properties under various illumination conditions.
UR - http://www.scopus.com/inward/record.url?scp=105004075499&partnerID=8YFLogxK
U2 - 10.1364/OE.559578
DO - 10.1364/OE.559578
M3 - Article
AN - SCOPUS:105004075499
VL - 33
SP - 19418
EP - 19441
JO - Optics express
JF - Optics express
SN - 1094-4087
IS - 9
ER -