Rigó, I.; Veres, M.; Himics, L.; Pápa, Z.; Hakkel, O.; Fürjes, P. Enhancement in Inverse Pyramid SERS Substrates with Entrapped Gold Nanoparticles. Preprints2019, 2019090135. https://doi.org/10.20944/preprints201909.0135.v1
Rigó, I., Veres, M., Himics, L., Pápa, Z., Hakkel, O., & Fürjes, P. (2019). Enhancement in Inverse Pyramid SERS Substrates with Entrapped Gold Nanoparticles. Preprints. https://doi.org/10.20944/preprints201909.0135.v1
Rigó, I., Orsolya Hakkel and P. Fürjes. 2019 "Enhancement in Inverse Pyramid SERS Substrates with Entrapped Gold Nanoparticles" Preprints. https://doi.org/10.20944/preprints201909.0135.v1
Giant plasmonic surface enhancement has been observed in gold coated micron sized inverse pyramids entrapping a gold nanoparticle. The amplification of both surface enhanced Raman and photoluminescence signals was found to be dependent on the diameter of trapped gold nanoparticle and around 50-fold enhancement was detected for 250nm diameter sample relatively to the 50nm one. Finite differential time domain simulations, performed to determine the near-field distribution in the structure, showed that when the nanoparticle protrudes into the hotspot zone of the void, coupling of electromagnetic field occurs and the plasmon-related near-field enhancement is concentrated into the close vicinity of the nanoparticle, mainly into the close gaps around the tangential points of the curved sphere and the flat pyramid surface. This results in a more than 15 times increase of the near-field intensity, compared to the empty void.
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.