Shape Deformation of Nanoresonator: A Quasinormal-Mode Perturbation Theory - Archive ouverte HAL Access content directly
Journal Articles Physical Review Letters Year : 2020

Shape Deformation of Nanoresonator: A Quasinormal-Mode Perturbation Theory

(1, 2) , (3) , (1, 2)
1
2
3

Abstract

When material parameters are fixed, optical responses of nanoresonators are dictated by their shapes and dimensions. Therefore, both designing nanoresonators and understanding their underlying physics would benefit from a theory that predicts the evolutions of resonance modes of open systems—the so-called quasinormal modes (QNMs)—as the nanoresonator shape changes. QNM perturbation theories (PTs) are one ideal choice. However, existing theories developed for tiny material changes are unable to provide accurate perturbation corrections for shape deformations. By introducing a novel extrapolation technique, we develop a rigorous QNM PT that faithfully represents the electromagnetic fields in perturbed domain. Numerical tests performed on the eigenfrequencies, eigenmodes, and optical responses of deformed nanoresonators evidence the predictive force of the present PT, even for large deformations. This opens new avenues for inverse design, as we exemplify by designing super-cavity modes and exceptional points with remarkable ease and physical insight.

Dates and versions

hal-03001919 , version 1 (12-11-2020)

Identifiers

Cite

Wei Yan, Philippe Lalanne, Min Qiu. Shape Deformation of Nanoresonator: A Quasinormal-Mode Perturbation Theory. Physical Review Letters, 2020, 125 (1), ⟨10.1103/PhysRevLett.125.013901⟩. ⟨hal-03001919⟩
30 View
0 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More