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Plasmonic Nanocrystal Arrays on Photonic Crystals with Tailored Optical Resonances

Wang, J.; Le-The, H.; Karamanos, T.; Suryadharma, R. N. S.; Berg, A. van den; Pinkse, P. W. H.; Rockstuhl, C.; Shui, L.; Eijkel, J. C. T.; Segerink, L. I.

Hierarchical plasmonic–photonic microspheres (PPMs) with high controllability in their structures and optical properties have been explored toward surface-enhanced Raman spectroscopy. The PPMs consist of gold nanocrystal (AuNC) arrays (3rd-tier) anchored on a hexagonal nanopattern (2nd-tier) assembled from silica nanoparticles (SiO$_{2}$NPs) where the uniform microsphere backbone is termed the 1st-tier. The PPMs sustain both photonic stop band (PSB) properties, resulting from periodic SiO$_{2}$NP arrangements of the 2nd-tier, and a surface plasmon resonance (SPR), resulting from AuNC arrays of the 3rd-tier. Thanks to the synergistic effects of the photonic crystal (PC) structure and the AuNC array, the electromagnetic (EM) field in such a multiscale composite structure can tremendously be enhanced at certain wavelengths. These effects are demonstrated by experimentally evaluating the Raman enhancement of benzenethiol (BT) as a probe molecule and are confirmed via numerical simulations. We achieve a maximum SERS enhancement factor of up to ~10$^{8}$ when the resonances are tailored to coincide with the excitation wavelength by suitable structural modifications.

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Verlagsausgabe §
DOI: 10.5445/IR/1000123510
Veröffentlicht am 25.09.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Theoretische Festkörperphysik (TFP)
Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1944-8244, 1944-8252
KITopen-ID: 1000123510
Erschienen in ACS applied materials & interfaces
Band 12
Heft 33
Seiten 37657-37669
Schlagwörter plasmonic-photonic microsphere, photonic stop band, slow light effect, localized surface plasmon resonance, surface-enhanced Raman spectroscopy
Nachgewiesen in Web of Science
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