期刊
PHYSICAL REVIEW LETTERS
卷 125, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.013901
关键词
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资金
- National Key Research and Development Program of China [2017YFA0205700]
- National Natural Science Foundation of China [61927820]
- ANR project Resonance [ANR-16-CE24-0013]
- Agence Nationale de la Recherche (ANR) [ANR-16-CE24-0013] Funding Source: Agence Nationale de la Recherche (ANR)
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 deforniations. 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.
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