Highly efficient nano-tips with metal-dielectric coatings for tip-enhanced spectroscopy applications
In: Chemical Physics Letters, Jg. 453 (2008), Heft 4/6, S. 262 - 265
Titel:
Highly efficient nano-tips with metal-dielectric coatings for tip-enhanced spectroscopy applications
Autor*in:
Cui, XudongUDE
- LSF ID
- 49135
- Sonstiges
- der Hochschule zugeordnete*r Autor*in
- GND
- 1175897205
- LSF ID
- 47126
- ORCID
- 0000-0002-1467-6373
- Sonstiges
- der Hochschule zugeordnete*r Autor*in
Erscheinungsjahr:
2008
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.