Highly efficient plasmonic tip design for plasmon nanofocusing in near-field optical microscopy

Nanoscale
Takayuki UmakoshiPrabhat Verma

Abstract

Near-field scanning optical microscopy (NSOM) combined with plasmon nanofocusing is a powerful nano-analytical tool due to its attractive feature of efficient background suppression as well as light energy compression to the nanoscale. In plasmon nanofocusing-based NSOM, the metallic tip plays an important role in inducing plasmon nanofocusing. It is, however, very challenging to control plasmonic properties of tips for plasmon nanofocusing with existing tip fabrication methods, even though the plasmonic properties need to be adjusted to experimental environments such as the sample or excitation wavelength. In this study, we propose an efficient tip design and fabrication which enable one to actively control plasmonic properties for efficient plasmon nanofocusing. Because our method offers flexibility in the material and structure of tips, one can easily modify the plasmonic properties depending on the requirements. Importantly, through optimization of the plasmonic properties, we achieve almost 100% reproducibility in plasmon nanofocusing in our experiments. This new approach of tip fabrication makes plasmon nanofocusing-based NSOM practical and reliable, and opens doors for many scientists working in related fields.

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Citations

Aug 24, 2016·Nano Letters·Surong GuoPeter A van Aken
May 2, 2017·Chemical Reviews·Prabhat Verma
Jun 24, 2017·Chemical Society Reviews·Tanja Deckert-GaudigVolker Deckert
Dec 31, 2019·Beilstein Journal of Nanotechnology·Nahid HosseiniGeorg E Fantner
Jul 14, 2019·Nanoscale Research Letters·Robin R JonesVentsislav K Valev
Jun 17, 2020·Science Advances·Takayuki UmakoshiPrabhat Verma
Oct 27, 2020·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Robin LingstädtPeter A van Aken
Dec 6, 2020·Scientific Reports·Rhea Thankam SamPrabhat Verma
Mar 21, 2019·Biochimica Et Biophysica Acta. General Subjects·Takayuki UmakoshiToshio Ando
Dec 30, 2020·ACS Applied Materials & Interfaces·David KuhnessHarald Plank

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