IEEE Spectrum breed · Technology

Multipole Resonances in Dielectric Metasurfaces

Dielectric metasurfaces offer low-loss alternatives for controlling light. Their performance relies on engineered optical resonances, which can be predicted and understood using multipole decomposition.

A single quadrumer meta-atom, initially studied for its magnetic octupole response, can evolve into distinct light manipulation regimes. This foundational work shows how arranging quadrumers into a periodic crystalline silicon metasurface leads to anomalous absorption enhancement.

This enhancement is governed by two independent multipole mechanisms coexisting within the same structure. Ongoing work on a gallium nitride metasurface uses the interplay of four different multipoles to sculpt reflection and transmission spectra, including quasi-bound-states-in-the-continuum (q-BIC) manipulation.

COMSOL Multiphysics® and multipole decomposition connect full-wave simulation with analytical insight, translating abstract resonance behavior into interpretable design rules. Multipole-based simulation serves as a design strategy for tailoring absorption, reflection, and transmission in dielectric metasurfaces.

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