The Study of SiO2 and Ag Plasmonic Photonic Crystal Fiber for Optical communication

hexagonal photonic crystal fiber polarization filter is designed in this work, the design is supported by two ellipse Ag rods to achieve surface plasmon resonance (SPR) modes. The finite element method was used to study the effect of the geometrical parameters, hole pitch (p), and photonic crystal holes (d) of the photonic crystal fiber on the performance of the filter. The filtration properties can be modified by changing the structural parameters. With the $\mathrm{p}=1.6\mu \mathrm{m}$ hole pitch, the peak loss of the core mode X-polarized at the resonance wavelength $1\mu \mathrm{m}$ is 285.2 $\mathrm{d}\mathrm{B}/\mathrm{c}\mathrm{m}$. This indicates that the wavelength $(1\mu \mathrm{m})$ can be filtered at a hole pitch of $\mathrm{p}=1.6\mu \mathrm{m}$. In addition, the frequencies $0.9\mu \mathrm{m}0.85\mu \mathrm{m}$ and $0.75\mu \mathrm{m}$ can be filtered at $\mathrm{p}=1.8\mu \mathrm{m}, \mathrm{p}=2\mu \mathrm{m}$, and $\mathrm{p}=2.2$, since the loss peaks are 376.8 $\mathrm{d}\mathrm{B}/\mathrm{c}\mathrm{m}$, 438.14 $\mathrm{d}\mathrm{B}/\mathrm{c}\mathrm{m}$ and 312.6 $\mathrm{d}\mathrm{B}/\mathrm{c}\mathrm{m}$ respectively. The tuneability of the hole pitch (p) offers the flexibility to produce plasmon resonances. At the resonance wavelength 0.75 $\mu \mathrm{m}$ and fixed at $\mathrm{p}=2.2\mu \mathrm{m}$, the confinement losses reduce with values 450.86, 419.38, and 376.81dB/cm with decreasing the circular air holes d, this indicates that at a single resonant frequency, it is possible to control the amount of the confinement losses. Through the results, the design can be used in the field of optical fiber communication as filters for unwanted frequencies.