This book deals with the study of electromagnetic wave propagation through some new smart structures and refractive index profiles. The objective of the present book is to describe the modal propagation characteristics of some unusual optical waveguides having new geometrical cross-sections with different types of claddings, including dielectric, metallic, and helical. It provides the discussion of the tolerance study of a square waveguide into concave lens shapes, and the concept of negative refraction and photonic band gap in the case of helical waveguide. The book also illustrates the...

During the past two and half decades, light propagation in complex structures has aroused considerable interest of many investigators. Early work of E. Yablonovitch and his co-workers and also by S. John stimulated tremendously the interest of many researchers, who suggested that diffraction by periodic structures might lead to a photonic insulator in which propagation of light is forbidden in a certain range of frequencies. These photonic insulators are known as Photonic Band Gap (PBG) structures have a large number of applications in the field of photonics and integrated optics. Many...