Sensitivity enhancement of fiber-optic refractive index sensor based on multimode interference with gold nanoparticles

Shuji Taue, Hiroyuki Daitoh, Hideki Fukano

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

In this study, we investigated combinations of fiber-based multimode interference (MMI) sensors with gold nanoparticles (NPs). Gold NPs were synthesized and attached to the MMI sensor region using a silane-coupling agent. Light absorption due to the NPs was confirmed at wavelengths of 560nm and longer, including the telecommunication band (1300-1600 nm). We examined the variation in the interfered wavelengths with changes in the medium surrounding the MMI sensor, both with and without NPs. The interfered wavelengths were redshifted when the refractive index (RI) increased, and the shift with NPs was almost twice as large as the shift without NPs. We determined the sensitivity of the MMI sensor with NPs to be approximately 218.28nm/RIU (refractive index unit) in a refractive index range from 1.31535 to 1.35199.

Original languageEnglish
Article number04DL07
JournalJapanese Journal of Applied Physics
Volume54
Issue number4
DOIs
Publication statusPublished - Apr 1 2015

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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