Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 33, Pages 37657-37669Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c05596
Keywords
plasmonic-photonic microsphere; photonic stop band; slow light effect; localized surface plasmon resonance; surface-enhanced Raman spectroscopy
Funding
- National Key Research & Development Program of China [2016YFB0401502]
- Special Fund Project of Science and Technology Application in Guangdong [2017B020240002]
- Science and Technology Program of Guangzhou [2019050001]
- Pioneers in Healthcare voucher (project Ischemia on chip) of the University of Twente
- MST
- ZGT in the Netherlands
- Oversea study of Guangzhou Elite Project support in China
- NWA Startup Quantum NanoKeys grant [40017607]
- Alexander von Humboldt Foundation
- German Science Foundation [EXC-2082/1-390761711]
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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 SiO2NP 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 similar to 10(8) when the resonances are tailored to coincide with the excitation wavelength by suitable structural modifications.
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