Abstract
Localized surface plasmon polaritons, which are referred to simply as localized surface plasmons, are carrier oscillations in inorganic nanoparticles (NPs) that are excited by incident light waves. At the NP surface, the localized surface plasmons exhibit enhanced near-field amplitudes, which are highly localized at the NP surface and decay rapidly in the dielectric surroundings. A very important aspect of localized surface plasmons is the localization of an enhanced electromagnetic field around the NPs with very high spatial resolution (subwavelength). A precise control over the free electron density of indium tin oxide NPs enables us to tune the LSPR wavelength in the NIR regions. An electric field enhancement based on NIR surface plasmons was estimated to be 5.24-4.41. The surface plasmon coupling between highly symmetrical Au dimers was investigated in detail, and a dark plasmon coupling mode was found to be applied to the plasmon propagation without significant scattering loss.
