Nanophotonics is a comprehensive introduction to the emerging area concerned with controlling and shaping optical fields at a subwavelength scale. Written by distinguished scientists in nanophotonics, it covers most aspects of the field, from the basics to the most advanced technologies. Photonic crystals and microcavities are extensively described, including non-linear optical effects. Local-probe techniques are presented and are used to characterize plasmonic devices. The emerging fields of semiconductor nanocrystals and nano-biophotonics are also presented.