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Proceedings Paper

Metallic tips for efficient plasmon nanofocusing and advanced optical nano-imaging
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Paper Abstract

Plasmon nanofocusing, a phenomenon where plasmons propagate on a tapered metallic structure with compressing its energy into a nanometric volume of the apex to generate localized electric field, holds a great promise for near-field optical imaging techniques due to its background-free nature. Because it does not require to illuminate the tip apex with an incident laser, one can efficiently eliminate scattering background noise by the incident laser, which has been an issue in conventional near-field optical microscopies. To apply plasmon nanofocusing for near-field optical imaging, a tapered metallic tip plays an important role as a base material for plasmon propagation. It is therefore essential to establish an efficient and practical methods of the metallic tip fabrication for plasmon-nanofocusing-based optical imaging techniques. In this study, we propose an optimized tip fabrication for efficient plasmon nanofocusing, which achieved 100% reproducibility in plasmon nanofocusing. Through numerical analysis, we have optimized the tip structure, such as types of material, metal thickness, plasmon coupler structure, etc. Also, the fabrication conditions were well-optimized to obtain smooth metal surface down to 0.5 nm roughness to reduce energy loss of plasmon propagation. Through thorough optimizations, we observed plasmon nanofocusing with 100% reproducibility in more than 20 fabricated metallic tips. Such efficient, reliable and practical tip fabrication opens the doors for many potential scientists working in related fields.

Paper Details

Date Published: 25 October 2018
PDF: 6 pages
Proc. SPIE 10726, Nanoimaging and Nanospectroscopy VI, 1072607 (25 October 2018); doi: 10.1117/12.2319705
Show Author Affiliations
Takayuki Umakoshi, Osaka Univ. (Japan)
Yuika Saito, Gakushuin Univ. (Japan)
Prabhat Verma, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 10726:
Nanoimaging and Nanospectroscopy VI
Prabhat Verma; Alexander Egner, Editor(s)

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