This book provides a guide to modern developments in photographic science and their possible applications to new and exciting areas, including nano-technology, solar cells, and organic semiconductors. Part I of this book describes the state of the art in photographic science, including recent developments. It describes the structure, formation and properties of silver halide (AgX) nano-particles and grains, the formation and performance of Ag clusters and nano-particles, and dye sensitization with J-aggregated dye layers. Part II describes the applications to new areas now in development, including digital photography, new nuclear-track emulsions, silver nano-particles for surface plasmon resonance, dye-sensitized solar cells, and organic semiconductors in relation to J-aggregated dye layers. Creating a record of accumulated knowledge in photographic science, this book also provides for these new areas a guide to the knowledge and ideas that arise from synergetic interactions between photographic science and technology which have pioneered unique applications of nano-particles, J-aggregates, and dye sensitization.