Open AccessFour-wave mixing-based photonic crystal fiber microfluid sensor with embedded U-shape microslits
Author(s) -
Duo Yi,
Meini Su,
Xin Tan,
Yanquan Geng,
Xuejin Li,
Lina Wang,
Xueming Hong
Publication year - 2021
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.419705
Subject(s) - materials science , photonic crystal fiber , refractive index , wavelength , femtosecond , optics , figure of merit , signal (programming language) , dispersion (optics) , laser , fiber optic sensor , mixing (physics) , fiber , optoelectronics , physics , computer science , composite material , programming language , quantum mechanics
In this paper, we propose a four-wave mixing-based photonic crystal fiber (PCF) microfluid sensor, and two U-shape microslits fabricated by a femtosecond laser are embedded into the sensor for real-time microfluid measurement. Theoretical and experimental results prove that the signal wavelength is sensitive to both the refractive index (RI) and the material dispersion property of the liquid sample filled into the air channels. For different aqueous target samples at low concentrations, the responses of signal wavelength are consistent with each other. The obtained RI sensitivity is approximately 881.36 nm/RIU, and the sensing resolution is around 1.6 × 10 -4 RIU. The proposed sensor also shows a better figure of merit (FOM) as high as 313.65 RIU -1 when compared with the fiber SPR sensors. Besides, the signal wavelengths present different responses with the increasing aqueous concentration due to the separated dispersion characteristics of the filled liquid samples, which can be potentially applied for the discrimination of liquid samples with a well-designed wavelength-coded sensor array in the future.