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Nonlinear absorption in bis(1-butyl-3-methylimidazolium) tetrathiocyanatozincate [BMIM]2[Zn(SCN)4] an ionic liquid with a transition metal in the anionic moiety
1 , * 1 , 2 , 2 , 2 , * 3 , 4 , 3
1  Departamento de Física Aplicada, Universidade de Santiago de Compostela, Campus Vida s/n E-15782. Santiago de Compostela, Spain
2  Area de Óptica, Facultade de Ciencias de Ourense, Universidade de Vigo, As Lagoas s/n, Ourense, 32004 Spain
3  Departamento de Química Orgánica. Facultade de Ciencias. Universidade de Santiago de Compostela. Campus Terra. 27080-Lugo. Spain
4  Departamento de Física Aplicada, Universidad de Vigo, Facultad de Ciencias, Campus As Lagoas, 32004 Ourense, Spain


Nonlinear absorption has been investigated by open aperture z-scan in ionic liquids obtained by combination of 1-butyl-3-methyl-imidazolium cations with anions containing a transition metal (Zn) and thiocyanate groups. The laser source was a Ti: Sapphire oscillator (80-fs pulses, λ= 810 nm, repetition rate of 80.75 MHz). This ionic liquid presents quite low heat capacity that favors the development of strong thermal effects at 810 nm. Thermal effects and nonlinear absorption make it a potential material for optical limiting purposes.

Keywords: ionic liquid, thiocyanate, Zinc, nonlinear optic,