title: Nonlocal nonlinear refractive index of gold nanoparticles synthesized by ascorbic acid reduction: comparison of fitting models.
abstract: In this paper, the nonlinear refractive index of colloidal gold nanoparticles under continuous wave illumination is investigated with thez-scan technique. Gold nanoparticles were synthesized using ascorbic acid as reductant, phosphates as stabilizer and cetyltrimethylammonium chloride (CTAC) as surfactant agent. The nanoparticle size was controlled with the CTAC concentration. Experiments changing incident power and sample concentration were done. The experimentalz-scan results were fitted with three models: thermal lens, aberrant thermal lens and the nonlocal model. It is shown that the nonlocal model reproduces with exceptionally good agreement; the obtained experimental behaviour.
authors.affiliation: Facultad de Ciencias Físico-Matemáticas, Benemérita Universidad Autónoma de Puebla , Av. San Claudio y 18 Sur. Col. San Manuel, C.P. 72570 , Puebla , Puebla , México.
authors.forename: A
authors.initials: A
authors.lastname: Balbuena Ortega
authors.affiliation: Facultad de Ciencias Físico-Matemáticas, Benemérita Universidad Autónoma de Puebla , Av. San Claudio y 18 Sur. Col. San Manuel, C.P. 72570 , Puebla , Puebla , México.
authors.forename: M L
authors.initials: ML
authors.lastname: Arroyo Carrasco
authors.affiliation: Facultad de Ciencias Físico-Matemáticas, Benemérita Universidad Autónoma de Puebla , Av. San Claudio y 18 Sur. Col. San Manuel, C.P. 72570 , Puebla , Puebla , México.
authors.forename: M M
authors.initials: MM
authors.lastname: Méndez Otero
authors.affiliation: CIBA-IPN Tlaxcala , Km. 1.5 Carretera Estatal Tecuexcomac-Tepetitla, C.P. 90700 , Tepetitla de Lardizabal , Tlaxcala , México.
authors.forename: V L
authors.initials: VL
authors.lastname: Gayou
authors.affiliation: CIBA-IPN Tlaxcala , Km. 1.5 Carretera Estatal Tecuexcomac-Tepetitla, C.P. 90700 , Tepetitla de Lardizabal , Tlaxcala , México.
authors.forename: R
authors.initials: R
authors.lastname: Delgado Macuil
authors.affiliation: CNMN-IPN , Calle Luis Enrique Erro s/n, Unidad Profesional Adolfo López Mateos, Col. Zacatenco, C.P. 07738 DF , México.
authors.forename: H
authors.initials: H
authors.lastname: Martínez Gutiérrez
authors.affiliation: Instututo Nacional de Astrofísica Óptica y Electrónica , Luis Enrique Erro # 1, C.P. 72840 Tonantzintla , Puebla , México.
authors.forename: M D
authors.initials: MD
authors.lastname: Iturbe Castillo
keywords: gold nanoparticles; nonlocal nonlinear response; z-scan