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Raman spectroscopy is a powerful tool for detecting and identifying molecular structures and chemical bonds in materials. Diverse platforms have been developed to enhance spectroscopic sensitivity. We present a novel doubly enhanced Raman spectroscopy through an optoplasmonic microprobe configuration. The microprobe includes a high-Q whispering-gallery-mode microsphere resonator and nanoplasmonic structures on a substrate with samples sandwiched between them. The optoplasmonic hybrid modes can realize a two-order-of-magnitude improvement over traditional surface-enhanced Raman spectroscopies (SERS), such as commercial SERS test papers. Additionally, 2D Raman imaging is demonstrated by scanning the sample surfaces, showing a new tool for highly sensitive Raman spectroscopy imaging.
Wenbo Mao,Yihang Li,Zhiwen Liu, andLan Yang
"Raman spectroscopy and imaging enhanced by hybrid optoplasmonic resonance", Proc. SPIE PC12228, Ultrafast Nonlinear Imaging and Spectroscopy X, PC122280A (3 October 2022); https://doi.org/10.1117/12.2646631
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