Cui, Xudong; Erni, Daniel; Zhang, Weihua; Zenobi, Renato:
Highly efficient nano-tips with metal-dielectric coatings for tip-enhanced spectroscopy applications
2008
In: Chemical Physics Letters, Jg. 453 (2008), Heft 4/6, S. 262 - 265
Artikel/Aufsatz in Zeitschrift / Fach: Elektrotechnik
Titel:
Highly efficient nano-tips with metal-dielectric coatings for tip-enhanced spectroscopy applications
Autor(in):
Cui, Xudong im Online-Personal- und -Vorlesungsverzeichnis LSF anzeigen; Erni, Daniel im Online-Personal- und -Vorlesungsverzeichnis LSF anzeigen; Zhang, Weihua; Zenobi, Renato
Erscheinungsjahr
2008
Erschienen in:
Chemical Physics Letters, Jg. 453 (2008), Heft 4/6, S. 262 - 265
ISSN
WWW URL

Abstract:

We studied how a protection layer influences the performance of an Ag-coated dielectric tip in tip-enhanced Raman spectroscopy using 3D simulations. Two typical chemically inert materials, Au and SiO2 were considered in this work. Neither of them introduces a significant shift of the resonance frequency; the field enhancement as well as the spatial resolution can also be preserved with a thin protective layer. Surprisingly, a 5 nm layer of SiO2 can even improve the field enhancement of the tip. This provides a new method to prevent Ag tips from undesired physical and chemical damages without losing their original performance for TERS.