Plasmonic Coupling Effect in Ag Nanocap–Nanohole Pairs for Surface-Enhanced Raman Scattering

Autor:	Yonghua Lu, Zheng Xi, Xiaojin Jiao, Guosheng Xue, Wenhai Yu, Xiaolei Wen, Steve Blair, Pei Wang, Douguo Zhang, Hai Ming
Rok vydání:	2012
Předmět:	Surface (mathematics) Materials science business.industry Biophysics Physics::Optics Hot spot (veterinary medicine) Plasmonic coupling Biochemistry Evaporation (deposition) Signal symbols.namesake Optics Electric field symbols Optoelectronics business Raman scattering Plasmon Biotechnology
Zdroj:	Plasmonics. 8:225-231
ISSN:	1557-1963 1557-1955
DOI:	10.1007/s11468-012-9379-8
Popis:	A plasmonic coupling structure composed of Ag nanocap–nanohole pairs was fabricated through a novel and facile method. Both surface-enhanced Raman scattering (SERS) measurements and numerical simulations show that the cap-hole system produces much larger electric field enhancement and SERS signal than the isolated structures, which is due to the plasmonic coupling effect between the gap of the cap and the hole. Additionally, the plasmonic enhancement is sensitive to the gap size, which can be controlled by the Ag layer thickness during the evaporation process. A maximum enhancement factor of 1.1×108 can be obtained with optimized gap size.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f238fd02d9d1e3d890e51606e1b869c8 https://doi.org/10.1007/s11468-012-9379-8 Zobrazit plný text záznamu Full text from SpringerLink