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

Takayuki Umakoshi; Yuika Saito; Prabhat Verma

doi:10.1117/12.2319705

25 October 2018 Metallic tips for efficient plasmon nanofocusing and advanced optical nano-imaging

Takayuki Umakoshi, Yuika Saito, Prabhat Verma

Proceedings Volume 10726, Nanoimaging and Nanospectroscopy VI; 1072607 (2018) https://doi.org/10.1117/12.2319705
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

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.

Citation Download Citation

Takayuki Umakoshi, Yuika Saito, and Prabhat Verma "Metallic tips for efficient plasmon nanofocusing and advanced optical nano-imaging", Proc. SPIE 10726, Nanoimaging and Nanospectroscopy VI, 1072607 (25 October 2018); https://doi.org/10.1117/12.2319705

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
6 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Plasmons

Silver

Silicon

Coating

Near field optics

Near field scanning optical microscopy

Polarization

Show All Keywords

Keywords/Phrases

Search In:

Publication Years