Raman spectroscopy has been used to sense molecule thanks to the specific vibration mode. However, the process is inefficient and strongly correlated with local electric field. The field oscillation in a confined nanostructures of metal can induce localized surface plasmon resonances (LSPR) that can induce high electric field. Therefore, Raman signal can be enhanced, so called surface-enhanced Raman scattering (SERS). Furthermore, to enhance light-matter interaction, we aim to engender electromagnetic coupling between LSPR in metal and cavity modes in dielectric. We proposed a Au-NPs/p-NiO/Au film (ANA) heterostructure to introduce strong coupling and evaluate the effect toward Raman sensing. We design and simulate the possible structure to realize the optical benefit. The heterostructure is experimentally realized via air-liquid interface self-assembly, fulfilling the ultrastrong coupling condition with Rabi splitting energy larger than 650 meV. The demonstrations brought out the bright future of plasmonic hybrid platform that can be further improved for sensing application.
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