Electric and magnetic multipole centers

Alex Kildishev; Karim Achouri; Daria Smirnova

doi:10.1117/12.3015671

11 June 2024 Electric and magnetic multipole centers

Alex Kildishev, Karim Achouri, Daria Smirnova

Proceedings Volume PC12991, Nanophotonics X; PC129910D (2024) https://doi.org/10.1117/12.3015671
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

Multipole expansions enable rapid numerical modeling of optical scatterer arrays, but choosing expansion centers is ambiguous. We derive optimal centers where multipolar spectra become unique, separately minimizing electric and magnetic quadrupole norms. This significantly reduces computations, benefiting differentiable solvers critical for machine learning photonics design. Analysis of dispersive mutual center positions provides insight into scattering and optical forces. Connections to optomechanics, and quantum/topological photonics are also hinted through links between the number of optimal magnetic centers and the topological metrics of resonant modes.

Conference Presentation

Citation Download Citation

Alex Kildishev, Karim Achouri, and Daria Smirnova "Electric and magnetic multipole centers", Proc. SPIE PC12991, Nanophotonics X, PC129910D (11 June 2024); https://doi.org/10.1117/12.3015671

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