Photophysics and Nanophysics in Therapeutics explores the latest advances and applications of phototherapy and nanotherapy, covering the application of light, radiation, and nanotechnology in therapeutics, along with the fundamental principles of physics in these areas. Consisting of two parts, the book first features a range of chapters covering phototherapeutics, from the fundamentals of photodynamic therapy (PDT) to applications such as cancer treatment and advances in radiotherapy, applied physics in cancer radiotherapy treatment, and the role of carbon ion beam therapy. Other sections cover nanotherapeutics, potential applications and challenges, and nanotherapy for drug delivery to the brain. Final chapters delve into nanotechnology in the diagnosis and treatment of cancers, the role of nanocarriers for HIV treatment, nanoparticles for rheumatoid arthritis treatment, peptide functionalized nanomaterials as microbial sensors, and theranostic nanoagents.