Multipole engineering by displacement resonance: a new degree of freedom of Mie resonance

Yu-Lung Tang, Te-Hsin Yen, Kentaro Nishida, Chien-Hsuan Li, Yu-Chieh Chen, Tianyue Zhang, Chi-Kang Pai, Kuo-Ping Chen, Xiangping Li (), Junichi Takahara () and Shi-Wei Chu ()
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Yu-Lung Tang: National Taiwan University
Te-Hsin Yen: National Taiwan University
Kentaro Nishida: National Taiwan University
Chien-Hsuan Li: National Taiwan University
Yu-Chieh Chen: National Taiwan University
Tianyue Zhang: Jinan University
Chi-Kang Pai: National Taiwan University
Kuo-Ping Chen: National Yang Ming Chiao Tung University
Xiangping Li: Jinan University
Junichi Takahara: Osaka University
Shi-Wei Chu: National Taiwan University

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract The canonical studies on Mie scattering unravel strong electric/magnetic optical responses in nanostructures, laying foundation for emerging meta-photonic applications. Conventionally, the morphology-sensitive resonances hinge on the normalized frequency, i.e. particle size over wavelength, but non-paraxial incidence symmetry is overlooked. Here, through confocal reflection microscopy with a tight focus scanning over silicon nanostructures, the scattering point spread functions unveil distinctive spatial patterns featuring that linear scattering efficiency is maximal when the focus is misaligned. The underlying physical mechanism is the excitation of higher-order multipolar modes, not accessible by plane wave irradiation, via displacement resonance, which showcases a significant reduction of nonlinear response threshold, sign flip in all-optical switching, and spatial resolution enhancement. Our result fundamentally extends the century-old light scattering theory, and suggests new dimensions to tailor Mie resonances.

Date: 2023
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DOI: 10.1038/s41467-023-43063-y

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