ABSTRACT
Photonic devices require that the frequency and intensity of light can be controlled. This encourages people to search and study new materials for the fabrication of optical switching and limiting devices. Particularly, there has been increasing efforts made to exploit effective optical limiters to protect sensors and human eyes against laser threats. Typically, the optical nonlinear properties that can be employed to realize the purpose include two photon absorption (TPA), reverse saturable absorption (RSA), free carrier absorption, nonlinear refraction, and nonlinear scattering (Tutt et al. 1993, Perry et al. 1997).
