OPTICAL PROPERTIES OF NANOSTRUCTURES
Plasmonics is a rapidly growing research field, which explores the optical properties of metallic nanostructures, and inspires many applications from novel materials design to biomedical diagnostics. Plasmonics include two distinct phenomena: surface plasmon resonance (SPR) and localized surface plasmon resonance (LSPR). For thin noble metallic films, when electromagnetic (EM) waves interacts with the metallic surface, it will generate charge density wave, and at certain wavelength or incident geometry, when the horizontal component of the incident wavevector matches with the intrinsic wavevector of the charge density wave, a resonance absorbance will appear, which is referred to as SPR. For individual metallic nanostructures, similar resonance absorbance due to confined collective oscillation of electrons in the nanostructure can be observed, and is referred to as LSPR. The LSPR depends on the material, size, shape, and also the surrounding dielectric environment, and has been widely applied for chemical and biological sensing. We are interested in how to use GLAD to tune the nanostructure's optical properties, especially the plasmonic peoperties, and expore their applications.
