TY - JOUR
T1 - Sensitivity enhancement of fiber-optic refractive index sensor based on multimode interference with gold nanoparticles
AU - Taue, Shuji
AU - Daitoh, Hiroyuki
AU - Fukano, Hideki
N1 - Publisher Copyright:
© 2015 The Japan Society of Applied Physics.
PY - 2015/4/1
Y1 - 2015/4/1
N2 - 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.
AB - 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.
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U2 - 10.7567/JJAP.54.04DL07
DO - 10.7567/JJAP.54.04DL07
M3 - Article
AN - SCOPUS:84926343642
SN - 0021-4922
VL - 54
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
IS - 4
M1 - 04DL07
ER -