11:30 AM - 11:45 AM
▲ [9a-Z16-5] Numerical study of photonic nanojet effect on metal nanopillars SERS substrate
Keywords:surface-enhanced Raman scattering, photonic nanojet, finite-difference time-domain method
The surface-enhanced Raman scattering has been used for many applications such as chemical analysis and biological detection. An enhancement method can be used by applying the photonic nanojets, which is a narrow, high intensity light beam and can be generated by the microspheres attached on the SERS substrates. We consider to use the commercial metal nanopillars SERS substrate which is coated with polystyrene microspheres. The field intensities and enhancements by the micro/nano structure can be analyzed by the finite-difference time-domain method. It is found that the electric field intensity is effectively increased by photonic nanojet generated by adding microspheres. This method by combination of SERS and photonic nanojet indicate the potential of Raman enhancement.