TWO MODELS FOR THE CASCADE OF QUANTUM CASCADE DETECTOR OPERATING IN THE NEAR INFRA-RED RANGE

摘要

The local field approach and kinetic equation method is applied to calculate the line broadening of the surface plasmon resonance (SPR) in a spheroidal metal nanoparticle (MN) embedded in any dielectric media. Usually, both the surface and the radiative damping mechanisms play an important role in the plasmon decay. In the MNs of a smaller radii, the penetration depth of the plasmon field reduces and becomes more localized near the surface. As a result, the bulk-induced loss processes play only a minor role and the electronic excitations generated by the surface potential dominate.