Polarization-Independent Multiple Fano Resonances in Plasmonic Nonamers for Multimode-Matching Enhanced Multiband Second-Harmonic Generation
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AbstractPlasmonic oligomers composed of metallic nanoparticles are one class of the most promising platforms for generating Fano resonances with unprecedented optical properties for enhancing various linear and nonlinear optical processes. For efficient generation of second-harmonic emissions at multiple wavelength bands, it is critical to design a plasmonic oligomer concurrently having multiple Fano resonances spectrally matching the fundamental excitation wavelengths and multiple plasmon resonance modes coinciding with the harmonic wavelengths. Thus far, the realization of such a plasmonic oligomer remains a challenge. This study demonstrates both theoretically and experimentally that a plasmonic nonamer consisting of a gold nanocross surrounded by eight nanorods simultaneously sustains multiple polarization-independent Fano resonances in the near-infrared region and several higher-order plasmon resonances in the visible spectrum. Due to coherent amplification of the nonlinear excitation sources by the Fano resonances and efficient scattering-enhanced outcoupling by the higher-order modes, the second-harmonic emission of the nonamer is significantly increased at multiple spectral bands, and their spectral positions and radiation patterns can be flexibly manipulated by easily tuning the length of the surrounding nanorods in the nonamer. These results provide us with important implications for realizing ultrafast multichannel nonlinear optoelectronic devices.
All Author(s) ListLiu SD, Leong ESP, Li GC, Hou YD, Deng J, Teng JH, Ong HC, Lei DY
Journal nameACS Nano
Year2016
Month1
Day1
Volume Number10
Issue Number1
PublisherAMER CHEMICAL SOC
Pages1442 - 1453
ISSN1936-0851
eISSN1936-086X
LanguagesEnglish-United Kingdom
KeywordsFano resonances; higher-order plasmon modes; metallic nanostructures; plasmonic oligomers; second-harmonic generation
Web of Science Subject CategoriesChemistry; Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science; Materials Science, Multidisciplinary; Nanoscience & Nanotechnology; Science & Technology - Other Topics

Last updated on 2020-15-09 at 01:07