Quantitatively extracting the contribution of asymmetric local-field to χ^(2) in cross-shaped Ag nanoholes | Zendy

Jiawei Chen | Zendy; Kai Wang | Zendy; Hua Long | Zendy; Hongbo Hu | Zendy; Xiaobo Han | Zendy; Bing Wang | Zendy; Peixiang Lu | Zendy

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Quantitatively extracting the contribution of asymmetric local-field to χ^(2) in cross-shaped Ag nanoholes

Author(s) -

Jiawei Chen,

Kai Wang,

Hua Long,

Hongbo Hu,

Xiaobo Han,

Bing Wang,

Peixiang Lu

Publication year - 2017

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.25.001296

Subject(s) - local field , second harmonic generation , surface plasmon resonance , resonance (particle physics) , materials science , field (mathematics) , optics , wavelength , plasmon , nonlinear optics , high harmonic generation , laser , nonlinear system , distribution (mathematics) , surface plasmon , molecular physics , optoelectronics , condensed matter physics , physics , atomic physics , nanotechnology , nanoparticle , mathematical analysis , mathematics , quantum mechanics , pure mathematics

We systematically study the contribution of local-field distribution to second-harmonic generation (SHG) in cross-shaped Ag nanohole arrays, which is usually covered by resonance enhancement effect. By increasing one arm-length of the centrosymmetric cross-shaped Ag nanohole, the local-field distribution varies from centrosymmetric to non-centrosymmetric, while the localized surface plasmon resonance peak is red-shifted to the wavelength of the pumping laser accordingly. Both experimental and stimulated results indicate that the contribution of the asymmetric local-field distribution to SHG is quantitatively separated from a strong resonance enhancement effect. It shows that the pure effective second-order nonlinear susceptibility increases as the asymmetric degree of local-field distribution increases, and the largest effective second-order nonlinear susceptibility is ~2.5 times to that in a centrosymmetric local-field distribution. Our results provide evidence for optimizing the design of nonlinear plasmonic nanoantennas and metasurfaces.

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