New hollow core fiber design and porphyrin thin film deposition method towards enhanced optical fiber sensors

First of all a general introduction to PCF is given. Then the attention is focused on the derivation and the physical interpretation of the band structure and guiding mode. The concept of loss will be discussed completely and finally fabrication process for the new class of optical fiber is presented. Chapter 5. We introduce Photonic quasicrystal structures, several optical properties and novel applications of quasicrystals will be discussed. Different methods of quasicrystal analysis will be named. Finally, we study band structure and field distribution of 2 dimensional, 8-fold (Ammann-Beenker) and 12-fold symmetry with employing finite element method. We came to results of appearing band gap in such a low refractive index contrast of 1:1.46 with increasing the out of plane wave vector. Chapter 6. The fundamental principles to introduce Hollow core photonic Quasicrystal fibers is presented. Comparative study of different symmetries for study of Hollow core Photonic quasicrystal fiber (HC-PQF) is obtainable. Band gap for different structures of 12-fold and 8-fold will be calculated .we propose a new geometry which is called modified 8-fold with idea of attaining enhanced hollow core photonic quasi crystal. Expectedly Modified 8-fold represents extraordinary gap profile at permitting simultaneous propagation in two spectral windows. The results of bandgap are in agreement with fundamental mode dispersion relation and loss of the proposed HC-PQF. Conclusion, conclude this work with a discussion of achiev