Concentric microring structures containing gold nanoparticles for SERS-based applications

Concentric microring structures containing gold nanoparticles were fabricated using a Bessel-like beam array with the 30 μm and 60 μm periods. The fabricated structures coated with 5 nm thick gold layer demonstrate enhancement of Raman signals due to their induced localized plasmon resonance. The measured Raman signal intensity of self-assembled monolayers from thiols with terminal phenylalanine ring group with using various Raman spectrometers exhibit that concentric gold nanoparticles structures enhance the Raman signal from different size of analyzing area. The demonstrated method provides a facile fabrication of microring structures containing gold nanoparticles and shows their potential to exploit them for surface-enhanced Raman scattering (SERS) based applications.