Biosensing using dark-mode surface plasmons

2015 Fiscal Year Final Research Report

• Project/Area Number: 26600023
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Nanomaterials chemistry
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: Kajikawa Kotaro 東京工業大学, 総合理工学研究科(研究院), 教授 (10214305)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 表面プラズモン / メタマテリアル / バイオセンシング

Outline of Final Research Achievements

The dark mode localized surface plasmon (LSP) cannot be excited by by plane light wave, but it can be excited when a dipole source is located adjacent to the LSP structure. This structure shows Fano resonance or Electromagnetically-induced-transparency (EIT).
This study aims at understanding the dark mode plasmonics, and considers the application of the dark mode plasmonics to biosensors. We have investigated simple Fano structures on the basis of FDTD analysis. The structure was experimentally fabricated and measured the performance for biosensing. As a result, we found that the i-shape structure is promising for Fano resonance with high refractive index resolution.

Free Research Field

応用物理学