ABSTRACT
In recent years, nonlinear optical (NLO) materials have attracted substantial research interests due to their potential applications in information processing and telecommunications [1-4]. NLO processes are particularly useful in photonic devices where photons are used to transmit and process information. Modiœcation in the optical properties of a material by the strong oscillating electric œeld of a laser beam is in general discussed in the study of NLO. NLO processes have been observed in a wide variety of materials starting from molecules and clusters to bulk materials [5-14]. In molecular systems, the optical nonlinearity depends on the geometrical arrangement of molecules, whereas in case of bulk systems, the electronic characteristics of the system determine the optical nonlinearity. Various experimental as well as theoretical results have reported that NLO properties of small atomic clusters depend on the geometry and the electronic structure property of these materials [15,16].
