Journal
ACS NANO
Volume 9, Issue 6, Pages 6297-6304Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b01794
Keywords
localized surface plasmon resonance; near-field; SNOM; EELS; FIB; TERS
Categories
Funding
- INMETRO
- FAPERJ
- FINEP
- CNPq [552124/2011-7]
- FAPEMIG
- grant PRONAMETRO [52600.056330/2012, 52600.017575/2013, 52600.030929/2014]
- Academy of Finland
- TEKES
- European Union [604391]
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A reproducible route for tuning localized surface plasmon resonance in scattering type near-field optical microscopy probes is presented. The method is based on the production of a focused-ion-beam milled single groove near the apex of electrochemically etched gold tips. Electron energy-loss spectroscopy and scanning transmission electron microscopy are employed to obtain highly spatially and spectroscopically resolved maps of the milled probes, revealing localized surface plasmon resonance at visible and near-infrared wavelengths. By changing the distance L between the groove and the probe apex, the localized surface plasmon resonance energy can be fine-tuned at a desired absorption channel. Tip-enhanced Raman spectroscopy is applied as a test platform, and the results prove the reliability of the method to produce efficient scattering type near-field optical microscopy probes.
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