Journal
APPLIED PHYSICS LETTERS
Volume 109, Issue 15, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4964601
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Funding
- EPSRC [EP/G060649/1, EP/K028510/1, EP/L027151/1]
- ERC [LINASS 320503]
- Queens' College
- Royal Commission for the Exhibition of 1851
- EPSRC [EP/G060649/1, EP/K028510/1, EP/L027151/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G060649/1, EP/K028510/1, EP/L027151/1] Funding Source: researchfish
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Structured metallic tips are increasingly important for optical spectroscopies such as tip-enhanced Raman spectroscopy, with plasmonic resonances frequently cited as a mechanism for electric field enhancement. We probe the local optical response of sharp and spherical-tipped atomic force microscopy (AFM) tips using a scanning hyperspectral imaging technique to identify the plasmonic behaviour. Localised surface plasmon resonances which radiatively couple with far-field light are found only for spherical AFM tips, with little response for sharp AFM tips, in agreement with numerical simulations of the near-field response. The precise tip geometry is thus crucial for plasmon-enhanced spectroscopies, and the typical sharp cones are not preferred. Published by AIP Publishing.
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