Navegando por Palavras-chave "Nonlinear Optics"

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    Nonlinear optical study of p-bromo-benzylidene aniline-subtituted
    (Spie-int Soc Optical Engineering, 2013-01-01) Reis, A. K. C. A. [UNIFESP]; Paiva, D. R. [UNIFESP]; Reginato, M. M. [UNIFESP]; Alves, S. I. [UNIFESP]; Costa, MFPCM; Universidade Federal de São Paulo (UNIFESP)
    Schiff bases in general are important molecules from several aspects. They are compounds with a functional group that contains a carbon-nitrogen double bond with the nitrogen atom connected to an aryl or alkyl group, not hydrogen. Imines are crucial synthetic intermediates, they do have biological role and the salicylidene types may exibit thermocromic or photocromic properties. These latter two are connected to structural features, i.e., to the possibility of proton transfer complex formation. in this work, the Z-Scan technique is used to measure the nonlinear optical properties of p-bromo-benzylidene aniline substituted. All compounds display absorption bands in the range between 250 and 440 nm, being transparent in the near infrared region. Under 405 nm milliseconds excitation, the nonlinear optical process of p-bromo-benzylidene aniline substituted in DMSO solutions is caused by laser heating. the optical nonlinearity is proportional to the value of linear absorption and depends on substituent and his position.
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    The validation of the Z-Scan technique for the determination of plasma glucose
    (Spie-int Soc Optical Engineering, 2013-01-01) Alves, Sarah I. [UNIFESP]; Silva, Elaine A. O. [UNIFESP]; Costa, Simone S.; Sonego, Denise R. N. [UNIFESP]; Hallack, Maira L. [UNIFESP]; Coppini, Ornela L. [UNIFESP]; Rowies, Fernanda [UNIFESP]; Azzalis, Ligia A. [UNIFESP]; Junqueira, Virginia B. C. [UNIFESP]; Pereira, Edimar C. [UNIFESP]; Rocha, Katya C. [UNIFESP]; Fonseca, Fernando L. A. [UNIFESP]; Costa, MFPCM; Universidade Federal de São Paulo (UNIFESP)
    Glucose is the main energy source for the human body. the concentration of blood glucose is regulated by several hormones including both antagonists: insulin and glucagon. the quantification of glucose in the blood is used for diagnosing metabolic disorders of carbohydrates, such as diabetes, idiopathic hypoglycemia and pancreatic diseases. Currently, the methodology used for this determination is the enzymatic colorimetric with spectrophotometric. This study aimed to validate the use of measurements of nonlinear optical properties of plasma glucose via the Z-Scan technique. for this we used samples of calibrator patterns that simulate commercial samples of patients (ELITech(C)). Besides calibrators, serum glucose levels within acceptable reference values (normal control serum - Brazilian Society of Clinical Pathology and Laboratory Medicine) and also overestimated (pathological control serum - Brazilian Society of Clinical Pathology and Laboratory Medicine) were used in the methodology proposal. Calibrator dilutions were performed and determined by the Z-Scan technique for the preparation of calibration curve. in conclusion, Z-Scan method can be used to determinate glucose levels in biological samples with enzymatic colorimetric reaction and also to apply the same quality control parameters used in biochemistry clinical.