Enhancement of linear and nonlinear optical absorption coefficients in spherical dome semiconductor nanoshells by surface plasmon resonances

Optical Absorption Coefficient and Refractive-Index Change in a Coupled Quantum Dot-Metallic Nanoparticle Structure

“…The latter formulae are generalizations of those obtained using perturbation theory, and used in Refs. [44][45][46]. Afterwards, we used the derived formulae to calculate the OAC and RIC in a specific case of a semiconductor quantum-dot-metallic-nanoparticle system.…”

“…Here, α (1) and ∆n (1) n represent the linear OAC and RIC, respectively, while α (3) and ∆n (3) n give the third-order OAC and RIC, respectively. For T 1 = T 2 = 1/Γ, Equations ( 10), ( 11), ( 13) and ( 14) simply describe the widely used formulae for OAC and RIC in quantum dots that is obtained by perturbation theory [44][45][46]. Therefore, the present formulae are more general given that the contribution of T 1 and T 2 in OAC and RIC, which usually take different values in semiconductor nanostructures, is clarified.…”

“…[33][34][35][36][37][38][39][40][41][42][43], are the optical absorption coefficient (OAC) and the refractive index change (RIC). Recently, the two last-mentioned phenomena have been analyzed in semiconductor nanostructures, such as quantum dots, semiconductor nanoshells, and quantum wires coupled with a spherical metallic nanoparticle [44][45][46]. In these studies, the semiconductor nanostructures were modeled by a two-level quantum system that interacts with an electromagnetic field, while being coupled to the metallic nanoparticle, and the used OAC and RIC were obtained by the application of perturbation theory, in which only linear terms in the first order and nonlinear terms in the third order were considered [44][45][46].…”

“…Recently, the two last-mentioned phenomena have been analyzed in semiconductor nanostructures, such as quantum dots, semiconductor nanoshells, and quantum wires coupled with a spherical metallic nanoparticle [44][45][46]. In these studies, the semiconductor nanostructures were modeled by a two-level quantum system that interacts with an electromagnetic field, while being coupled to the metallic nanoparticle, and the used OAC and RIC were obtained by the application of perturbation theory, in which only linear terms in the first order and nonlinear terms in the third order were considered [44][45][46]. These works have shown that both the linear and third-order nonlinear OAC and the RIC in the semiconductor nanostructures are enhanced when the metallic nanoparticle is present.…”

“…These works have shown that both the linear and third-order nonlinear OAC and the RIC in the semiconductor nanostructures are enhanced when the metallic nanoparticle is present. In addition, the presence of the metallic nanoparticle strongly modifies the total OAC and RIC, and the OAC may show strong bleaching effects, i.e., the formation of a dip near resonance, which, in the case of extensive increment of the light intensity, can even lead to optical transparency [44][45][46].…”