Tuning Localized Surface Plasmon Resonance in Scanning Near-Field Optical Microscopy Probes
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- 作者：Thiago L. Vasconcelos ; Br谩ulio S. Archanjo ; Benjamin Fragneaud ; Bruno S. Oliveira ; Juha Riikonen ; Changfeng Li ; Douglas S. Ribeiro ; Cassiano Rabelo ; Wagner N. Rodrigues ; Ado Jorio ; Carlos A. Achete ; Luiz Gustavo Can莽ado
- 刊名：ACS Nano
- 出版年：2015
- 出版时间：June 23, 2015
- 年：2015
- 卷：9
- 期：6
- 页码：6297-6304
- ISSN：1936-086X
文摘
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.