 Recent advancements in plasmonic nanoparticle technology have opened up new possibilities in the areas of energy, catalysis, optics, biotechnology, and medicine. Plasmonic nanoparticles possess strong and tunable optical responses which can be manipulated with external light sources, making them ideal candidates for biomedical applications such as photothermotherapy. However, to fully realize the potential of these particles, further research into their fundamental properties and the development of novel diagnostic, therapeutic, and theranostic techniques are necessary. This article was authored by Miho Kim, Jung Hoon Lee, and Jwamin Nam.