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

Autor: Tang YL; Department of Physics, National Taiwan University, 1, Sec 4, Roosevelt Rd., Taipei, 10617, Taiwan., Yen TH; Department of Physics, National Taiwan University, 1, Sec 4, Roosevelt Rd., Taipei, 10617, Taiwan., Nishida K; Department of Physics, National Taiwan University, 1, Sec 4, Roosevelt Rd., Taipei, 10617, Taiwan., Li CH; Department of Physics, National Taiwan University, 1, Sec 4, Roosevelt Rd., Taipei, 10617, Taiwan., Chen YC; Department of Physics, National Taiwan University, 1, Sec 4, Roosevelt Rd., Taipei, 10617, Taiwan., Zhang T; Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou, 510632, China., Pai CK; Department of Physics, National Taiwan University, 1, Sec 4, Roosevelt Rd., Taipei, 10617, Taiwan., Chen KP; Institute of Imaging and Biomedical Photonics, National Yang Ming Chiao Tung University, 301 Gaofa 3rd Road, Tainan, 711, Taiwan.; Institute of Photonics Technologies, National Tsing Hua University, 301 Gaofa 3rd Road, Hsinchu, Taiwan., Li X; Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou, 510632, China. xiangpingli@jnu.edu.cn., Takahara J; Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan. takahara@ap.eng.osaka-u.ac.jp.; Photonics Center, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan. takahara@ap.eng.osaka-u.ac.jp., Chu SW; Department of Physics, National Taiwan University, 1, Sec 4, Roosevelt Rd., Taipei, 10617, Taiwan. swchu@phys.ntu.edu.tw.; Molecular Imaging Center, National Taiwan University, 1, Sec 4, Roosevelt Rd., Taipei, 10617, Taiwan. swchu@phys.ntu.edu.tw.; Brain Research Center, National Tsing Hua University, 101, Sec 2, Guangfu Road, Hsinchu, 30013, Taiwan. swchu@phys.ntu.edu.tw.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2023 Nov 08; Vol. 14 (1), pp. 7213. Date of Electronic Publication: 2023 Nov 08.
DOI: 10.1038/s41467-023-43063-y
Abstrakt: 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.
(© 2023. The Author(s).)
Databáze: MEDLINE
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