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Effect of L-alanine concentration on linear and nonlinear optical properties of two dyes in water and nano-confined water



  1. Department of Physics, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
  2. Nano Research Center, Ferdowsi University of Mashhad, Mashhad, Iran
  3. Department of Pediatrics, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran


The effect of L-alanine concentration with anionic Erythrosin B (EryB) and cationic Rhodamine 6G (R6G) dye in water and nano-confined water was studied by absorption, fluorescence and Z-Scan instruments. The nano-confined water was prepared with a mixture of water and n-decane and Sodium bis(2-ethylhexyl) sulfosuccinate (AOT) that the size of nanoconfined water can change with molar ratio of water to AOT (X). By the change of L-alanine concentration up to 1.5M, absorption spectra do not change and the peak position of absorption spectra is constant. The fluorescence spectra of AOT/n-Decane/Water/EryB with W=40, shows a peak at 555 nm that shifts to 553 nm by increasing of L-alanine concentration. The fluorescence intensity of mixed with AOT/n-Decane/Water/EryB with W=40 quenches by increasing of Lalanine concentration that this behavior was not observed in other samples. The nonlinear absorption (β) of EryB and also R6G nano-confined water is enhanced compared to bulk water. Moreover, the slope of β as function L-alanine concentration of for both of dyes in nano-confined water is higher than that of in bulk water. Therefore, the nano-confined water and the nonlinear absorption are suitable medium and parameter to detection of the L-alanine concentration..


Erythrosin B, Rhodamine 6G, Nonlinear optics, Z-Scan, Nano-confined water.

Submitted at: Nov. 7, 2017
Accepted at: June 7, 2018


M. POURTABRIZI, F. RAKHSHANIZADEH, S. SHARIFI, N. SHAHTAHMASSEBI, A. KOMPANY, Effect of L-alanine concentration on linear and nonlinear optical properties of two dyes in water and nano-confined water, Journal of Optoelectronics and Advanced Materials Vol. 20, Iss. 5-6, pp. 302-308 (2018)