研究目的
Investigating the effect of an applied magnetic field on the core mode properties of a magnetic fluid filled photonic crystal fiber (MFPCF) at 1557 nm.
研究成果
The study demonstrates that a small change in the effective refractive index of the MFPCF's core mode under an applied magnetic field can lead to significant changes in the effective mode area and confinement loss. These properties saturate beyond a certain magnetic field strength, indicating a limit to the tunability of the device. The results suggest that MFPCFs are suitable for applications such as tunable attenuators and field sensors.
研究不足
The effect of the magnetic field on the MFPCF saturates after about 500 Oe because the MF nanoparticles no longer change their magnetic orientation. This limits the tunability of the device beyond this magnetic field strength.
1：Experimental Design and Method Selection:
The study involved computing the refractive index change of the magnetic fluid (MF) due to the magnetic field and using it in simulations to find the effective refractive indices of the core and the first cladding modes of the MFPCF. Analytical computations were then performed to find the effective mode area and the confinement loss.
2：Sample Selection and Data Sources:
The MF used consists of 10 nm-sized Fe3O4 nanoparticles with 1.21% concentration in water. The NKT Photonics ESM-12B model PCF parameters were used in simulations.
3：21% concentration in water. The NKT Photonics ESM-12B model PCF parameters were used in simulations.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Finite-element simulation software was used for simulations. The MF's refractive index as a function of temperature and external magnetic field was empirically formulated.
4：Experimental Procedures and Operational Workflow:
The refractive index of the MF was computed at 1557 nm in a given magnetic field up to 500 Oe and used in simulations to compute the effective refractive indexes of the fundamental core mode and the FSM of the MFPCF. The effective mode area and the confinement loss were then computed analytically.
5：Data Analysis Methods:
The effective mode area was calculated using empirical formulas, and the confinement loss was calculated based on the imaginary part of the complex-valued effective refractive index of the core mode.
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