broadband and highly sensitive metallic ion sensing based on plasmon nanofocusing

2020 Fiscal Year Final Research Report

• Project/Area Number: 19K22109
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 28:Nano/micro science and related fields
• Research Institution: Osaka University
• Principal Investigator: VERMA Prabhat 大阪大学, 工学研究科, 教授 (60362662)
• Project Period (FY): 2019-06-28 – 2021-03-31
• Keywords: プラズモン / 吸収スペクトル / センシング

Outline of Final Research Achievements

I developed a broadband metal ion sensing technique based on plasmon nanofocusing, which enables simultaneous detection of various substances that have different absorption wavelengths. I first studied fundamental properties of plasmon nanofocusing, where I obtained new insights of broadband property of plasmon nanofocusing. I fabricated via nanolithographic techniques a metallic tapered structure that holds a slit structure on it, and induced broadband plasmon nanofocusing by irradiating the slit with a broadband light source. Using a broadband nanolight source generated at the taper apex, I realized simultaneous detection of various substances.

Free Research Field

ナノ分光学

Academic Significance and Societal Importance of the Research Achievements

プラズモン共鳴で生成される高強度な近接場光は、高感度な光センシングを実現できるため、金属イオン検出など様々な技術に応用されてきた。しかし、プラズモン共鳴は動作波長が狭いため、その広帯域化が求められていた。本研究で実現した広帯域なプラズモン超集束を用いた光センシング技術は、広帯域に異なる波長で様々な物質を同時検出できるため、実用性・汎用性を大幅に向上できる。新たな光センシング技術として、社会的にも今後大きな貢献が期待できる。