期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 16, 期 6, 页码 2289-2296出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3cp51730f
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资金
- Osterreichische Forschungsgemeinschaft (OFG)
- University of Vienna (KWA Programm)
- Austrian Science Fund FWF [P24511-N26]
- SFB NextLite
- Austrian Science Fund (FWF) [P 24511] Funding Source: researchfish
- Austrian Science Fund (FWF) [P24511] Funding Source: Austrian Science Fund (FWF)
A systematic study of the influence of the excitation angle, the light polarization and the coating thickness of commercial SPM tips on the field enhancement in an apertureless scanning near-field optical microscope is presented. A new method to optimize the alignment of the electric field vector along the major tip axis by measuring the resonance frequency was developed. The simulations were performed with a MNPBEM toolbox based on the Boundary Element Method (BEM). The influence of the coating thickness was investigated for the first time. Coatings below 40 nm showed a drastic influence both on the resonance wavelength and the enhancement. A shift to higher angles of incidence for the maximum enhancement could be observed for greater tip radii.
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