Plasmonic Nanocrystal Arrays on Photonic Crystals with Tailored Optical Resonances
| Autor: | Jan C.T. Eijkel, Theodosios D. Karamanos, Carsten Rockstuhl, Lingling Shui, Hai Le-The, Albert van den Berg, Loes I. Segerink, Pepijn W. H. Pinkse, Radius N. S. Suryadharma, Juan Wang |
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| Přispěvatelé: | Biomedical and Environmental Sensorsystems, Physics of Fluids, Laser Physics & Nonlinear Optics, Complex Photonic Systems |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
02 engineering and technology Stopband Plasmonic−photonic microsphere 010402 general chemistry 01 natural sciences symbols.namesake General Materials Science Surface plasmon resonance Plasmon Photonic crystal business.industry Slow light effect Surface-enhanced Raman spectroscopy Photonic stop band Localized surface plasmon resonance 021001 nanoscience & nanotechnology 0104 chemical sciences Nanocrystal symbols Optoelectronics Photonics 0210 nano-technology Raman spectroscopy business Research Article |
| Zdroj: | ACS applied materials & interfaces, 12(33), 37657-37669. American Chemical Society ACS Applied Materials & Interfaces |
| ISSN: | 1944-8244 |
| Popis: | 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 (SiO2NPs) 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 ∼108 when the resonances are tailored to coincide with the excitation wavelength by suitable structural modifications. |
| Databáze: | OpenAIRE |
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