Unmodified hot spot in hybridized nanorod dimer for extended surface-enhanced Raman scattering

Publication date: Available online 1 August 2019Source: Journal of Physics and Chemistry of SolidsAuthor(s): Junqiao Wang, Yanan Wu, Chunzhen Fan, Erjun Liang, Yan Li, Pei DingAbstractThe development of new and simple surface-enhanced substrates is primarily motivated by the ability to design and investigate the plasmonic structures to achieve the optimal performance in enhanced spectroscopy. In this work, we numerically design the plasmonic substrates by embedding a nanorod dimer antenna into a nanoring resonator. The single-layer composite substrate reveals a double-resonance response with a broad-spectrum electric field enchantment due to the plasmon hybridization of nanorod dimer and nanoring. The sandwiched substrate shows a complicated optical spectrum with multiple plasmon resonances, which can be attributed to the interaction of intralayer and interlayer plasmons. It is also worth mentioning that the electric field hot spots keep unmodified and concentrate at the middle gap of nanorod dimers in composite substrates at different excitation frequencies. The enhanced plasmonic substrate with consistent hot spots at different excitation frequencies can be used in surface-enhanced Raman spectroscopy and nonlinear optics.
Source: Journal of Physics and Chemistry of Solids - Category: Physics Source Type: research