Nanospectroscopy addresses the spectroscopy of very small objects down to single molecules or atoms or high resolution spectroscopy performed on regions much smaller than the wavelength of light revealing their local optical electronic and chemical properties This work highlights modern examples where optical nanospectroscopy is exploited in photonics optical sensing medicine or state of the art applications in material chemical and biological sciences Examples include the use of nanospectroscopy in such varied fields as quantum emitters dyes and two dimensional materials on solar cells radiation imaging detectors biosensors and sensors for explosives in biomolecular and cancer detection food science and cultural heritage studies Also by the editors Textbook Optical Nanospectroscopy _ Fundamentals Methods Vol 1 and _ Instrumentation Simulation Materials Vol 2