Photonics is the scientific study of light, its generation, detection and manipulation. The processes of emission, transmission, amplification and modulation of light are explored in this domain, mostly in the visible and near infrared spectrum of light. Light-emitting diodes, single photon sources, lasers and superluminescent diodes are some of the widely used light sources in photonics. Photonics is closely associated with optics. The fields of quantum optics, optomechanics, electro-optics, optoelectronics and quantum electronics are also closely related to photonics. The field of photonics has applications in diverse areas of telecommunications, information processing, spectroscopy, medicine, military technology, agriculture and robotics. This book elucidates the concepts and innovative models around prospective developments with respect to photonics. It includes some of the vital pieces of work being conducted across the world, on various topics related to this field. It is appropriate for students seeking detailed information in this area as well as for experts.