研究目的

To simulate using Finite-Difference Time-Domain (FDTD) technique of tapered LMA-8 PCF and for sensing application by improving the capabilities of PCF without collapsing the crystal holes.

研究成果

The advantage of scattering pattern and transverse transmission techniques is the capability to observe the diffraction pattern with light transverse and without having to cut the LMA-8 to destroy the sample. We have demonstrated that the scattering pattern is not a suitable technique to model the LMA-8 PCF as there is no relationship in pattern and uncluttered PCA with respect to taper ratio of 0.1 to 1.0 at 1.55 μm wavelength. This is because the LMA-8 fiber has bigger crystal size and bigger pitch size. Thus, this technique is more suitable to be applied when the crystal size is very small. As for the analysis of the transmission spectrum, there is a relationship between the transmission spectra and taper ratio of 0.1 and 1.0 at a range of 1.0 to 2.5 μm wavelength. Hence, this technique can be used to observe the difference in taper size. We proved that the LMA-8 PCF works equally well in tapered or un-tapered condition for the correlation of the transmission spectrum against the refractive index change from 1.33 to 1.43 in LMA-8 crystal holes.

研究不足

The scattering pattern is not a suitable technique to model the LMA-8 PCF as there is no relationship in pattern and uncluttered PCA with respect to taper ratio of 0.1 to 1.0 at 1.55 μm wavelength. This is because the LMA-8 fiber has bigger crystal size and bigger pitch size.