Coupled mode theory for metasurface design

Zhou, Ming; Belling, Samuel W.; Chen, Haotian; Yu, Zongfu

doi:10.1117/12.2528909

Cited by 2 publications

(1 citation statement)

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“…For example, full-wave simulations require huge computing costs and reveal very little physics. Meanwhile, although many models (e.g., coupled-mode theory (CMT) [18][19][20][21] , Fano's formula 22,23 , or effective circuit models 24,25 ) were proposed to analyze the underlying physics, they typically require model parameters fitted from simulation results, and thus cannot predict unknown phenomena before having studied the systems numerically. As an early attempt, a photonic tight-binding method (TBM) 26 , with all involved parameters computable without fitting procedures, was proposed to successfully predict the resonance peak positions of a coupled system.…”

Section: Introductionmentioning

confidence: 99%

Tailoring the lineshapes of coupled plasmonic systems based on a theory derived from first principles

et al. 2020

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Coupled photonic systems exhibit intriguing optical responses attracting intensive attention, but available theoretical tools either cannot reveal the underlying physics or are empirical in nature. Here, we derive a rigorous theoretical framework from first principles (i.e., Maxwell’s equations), with all parameters directly computable via wave function integrations, to study coupled photonic systems containing multiple resonators. Benchmark calculations against Mie theory reveal the physical meanings of the parameters defined in our theory and their mutual relations. After testing our theory numerically and experimentally on a realistic plasmonic system, we show how to utilize it to freely tailor the lineshape of a coupled system, involving two plasmonic resonators exhibiting arbitrary radiative losses, particularly how to create a completely “dark” mode with vanishing radiative loss (e.g., a bound state in continuum). All theoretical predictions are quantitatively verified by our experiments at near-infrared frequencies. Our results not only help understand the profound physics in such coupled photonic systems, but also offer a powerful tool for fast designing functional devices to meet diversified application requests.

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