期刊
OPTICS EXPRESS
卷 31, 期 4, 页码 6925-6937出版社
Optica Publishing Group
DOI: 10.1364/OE.481784
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Arrayed resonant cavity with outstanding optical trapping ability has been investigated as a flexible SERS sensor. By effective plasma coupling, a resonant cavity between IPSSPMMA and particle-film nanostructure is created. The system demonstrates high sensitivity, stability, uniformity, and reproducibility for potential applications in the food safety field.
Arrayed resonant cavity with outstanding optical trapping ability have received increasing attention in surface-enhanced Raman spectroscopy (SERS). Here, a three-dimensional (3D) composite AgNPs-Al2O3/Au/inverted patterned sapphire substrate PMMA (IPSSPMMA) flexible resonant cavity system is theoretically and experimentally investigated as a flexible SERS sensor. With the help of an effective plasma coupling (localized surface plasmons (LSPs) and surface plasmon polaritons (SPPs)), as shown by the Finite Element Method, a resonant cavity between IPSSPMMA and a particle-film nanostructure is created. Moreover, the proposed fabrication scheme can be easily used for large-scale fabrication. To measure the performance of IPSSPMMA, Rhodamine 6 G (R6G) and Crystalline violet (CV) were used as probe molecules with limit of detection (LOD) of 6.01 x 10-12 M and 5.36 x 10-10 M, respectively, and enhancement factors (EF) of R6G up to 8.6 x 109. Besides, in-situ detection of CV on the surface of aquatic products with a LOD of 3.96 x 10-5 M, enables highly sensitive in-situ detection of surface analytes. The Raman performance and in-situ detection results demonstrate that the proposed flexible compositing resonant cavity system has the advantages of ultra-sensitivity, stability, uniformity, and reproducibility, and has great potential for applications in the food safety field.
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