دانلود کتاب GUIDING LIGHT BY AND BEYOND THE TOTAL INTERNAL REFLECTION MECHANISM

Photonics plays an important role in modern technologies, e.g. in telecommunications and sensing systems. Waveguiding structures with micro- and nano-meter scale features are the basic building blocks of photonic circuits. Large varieties of structures have been used by scientists and engineers. These range from the conventional planar and channel waveguides, which work on the basis of the total-internal-reflection (TIR) mechanism, to the more advanced structures that utilize the anti-resonance-reflection, leaky-defect-resonance, and photonic-band-gap principles to (quasi-)confine and control the light. More and more complicated structures are emerging along with the development of both theory and fabrication technologies, leading to the improvement of existing applications and enabling access to many new application areas. As the fabrication of these devices usually involves costly facilities and time-consuming procedures, modeling tools are indispensable to explore new ideas, characterize and design the devices before their realization, as well as to understand the experimental results.

This thesis reports a series of techniques the author has developed to model various waveguiding structures, including the conventional planar and channel waveguides working by, and the advanced structures working beyond the TIR mechanism. Hence, this thesis contains both the methods and their applications to model and study the standard guided-wave and the advanced leaky-wave structures. The methods include mode solvers based on finite difference method (FDM) and finite element method (FEM), furnished with transparent boundary conditions (TBCs) for both guided and leaky modes. Based on the developed techniques, structures as simple as planar waveguides up to as complicated as photonic crystal fibers (PCFs) can be modeled rigorously.