Preprint Article Version 1 This version is not peer-reviewed

Enhancement in Inverse Pyramid SERS Substrates with Entrapped Gold Nanoparticles

Version 1 : Received: 12 September 2019 / Approved: 13 September 2019 / Online: 13 September 2019 (12:36:31 CEST)

How to cite: Rigó, I.; Veres, M.; Himics, L.; Pápa, Z.; Hakkel, O.; Fürjes, P. Enhancement in Inverse Pyramid SERS Substrates with Entrapped Gold Nanoparticles. Preprints 2019, 2019090135 (doi: 10.20944/preprints201909.0135.v1). Rigó, I.; Veres, M.; Himics, L.; Pápa, Z.; Hakkel, O.; Fürjes, P. Enhancement in Inverse Pyramid SERS Substrates with Entrapped Gold Nanoparticles. Preprints 2019, 2019090135 (doi: 10.20944/preprints201909.0135.v1).

Abstract

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.

Subject Areas

Surface-enhanced Raman spectroscopy (SERS); surface plasmons; Finite-Difference Time-Domain (FDTD) method; electromagnetic (EM) enhancement

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