CUED Publications database

Understanding the plasmonics of nanostructured atomic force microscopy tips

Sanders, A and Bowman, RW and Zhang, L and Turek, V and Sigle, DO and Lombardi, A and Weller, L and Baumberg, JJ (2016) Understanding the plasmonics of nanostructured atomic force microscopy tips. Applied Physics Letters, 109. ISSN 0003-6951

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� 2016 Author(s). 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.

Item Type: Article
Divisions: Div A > Energy
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:00
Last Modified: 22 May 2018 05:59