| 摘要 |
<p>Particles (10) comprising a core (12) surrounded by at least one shell (14) wherein at least one of the core (12) or one of the shells (14) is a metal and at least one of the core (12) or one of the shells (14) is a dielectric material which exhibits a third order nonlinear response. The 'shell' (14) of a metal particle (10) may be the adjacent region of a medium in which said particle is suspended, said medium having a third order nonlinear response. In a preferred embodiment, the particles (10) are suspended in a dielectric medium that may be linear or may exhibit a third order nonlinear response. Enhancement of the effective X (3) of the particles and suspensions result from the concentration of the electric field in and around the particles (10) at the plasmon resonance frequency of the metal.</p> |
