Efficient optical coupling into a single plasmonic nanostructure using a fiber-coupled microspherical cavity

• Takashima, Hideaki

• Kitajima, Kazutaka

• Tanaka, Yoshito

• Fujiwara, Hideki

• Sasaki, Keiji

Abstract

Toward complete coupling between propagating light (PL) and a single localized-surface-plasmon (LSP) nanostructure, we propose a tapered-fiber-coupled microspherical cavity system combining an Au-coated probe tip. This system possesses the unique characteristic of precise adjustability for the fiber-cavity coupling rate and the cavity-plasmon coupling rate, which is indispensable for achieving the critical coupling conditions. We successfully demonstrate the 93% PL coupling into the LSP antenna with an effective area of a 58 nm circle, exceeding the diffraction limit.

Journal

• Physical Review A

  Physical Review A 89 (2), 021801-1-021801-5, 2014-02-05

  American Physical Society

Details

• CRID: 1050282813998344192
• NII Article ID: 120005853093
• ISSN: 10941622
• ISSN: 10502947
• HANDLE: 2115/63205
• Text Lang: en
• Article Type: journal article
• Data Source:
  • IRDB
  • CiNii Articles