Zobrazeno 1 - 10
of 33
pro vyhledávání: '"R. E. de Araujo"'
Publikováno v:
Optics express. 28(21)
The use of highly sensitive thermometric methods is essential for the evaluation of nanoplatforms for photothermal therapy. In this study, the thermal lens technique was introduced to assess the optically induced temperature changes in colloidal samp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9f1b2bfbdb5c9ddc9d41cf9d6af29e66
https://pubmed.ncbi.nlm.nih.gov/33115118
https://pubmed.ncbi.nlm.nih.gov/33115118
Autor:
Adriana Fontes, R. E. de Araujo, Beate S. Santos, P. E. Cabral Filho, C. Tolentino Dominguez, C. Estupiñán-López
Publikováno v:
Journal of Luminescence. 174:17-21
In this study we evaluated the absolute fluorescence quantum yield ( Φ ) of hydrophilic CdTe QDs in function of different pHs, modified from the alkaline to acid, by using two different chemicals compounds, the mercaptosuccinic acid (MSA-the stabili
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7a0a05052ae63a0c872c4712849ff1a5
https://doi.org/10.1016/j.jlumin.2015.12.052
https://doi.org/10.1016/j.jlumin.2015.12.052
Publikováno v:
Review of Scientific Instruments. 90:033104
Z-scan is a well-established technique used to measure the nonlinear refractive index and absorption coefficient of thin and transparent materials. The method requires the displacement of the sample along the focus of a laser beam. Therefore, the Z-s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::623ac629d12a2bb121d6f301484f3bb2
https://doi.org/10.1063/1.5080051
https://doi.org/10.1063/1.5080051
Autor:
P. E. Cabral Filho, Younes Messaddeq, C.R. Chaves, Karina Nigoghossian, Beate S. Santos, Sybele Saska, Sidney José Lima Ribeiro, Adriana Fontes, A.S.L. Gomes, R. E. de Araujo, L.S.A. de Melo
Publikováno v:
Plasmonics. 8:1147-1153
Metallic nanoparticles (NPs) have been used to improve the sensibility of biosensors and bioassays either by enhancing radiative emission or inducing quenching process on fluorescent probes. The aim of this research was to study the interaction of si
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a0f0bdb3e4f8c4aa09bd234f1c3e27a8
https://doi.org/10.1007/s11468-013-9524-z
https://doi.org/10.1007/s11468-013-9524-z
Autor:
K. M. T. Oliveira, B. Cid de Araújo, Milan Trsic, Iouri Borissevitch, Anderson S. L. Gomes, R. E. de Araujo, A.G. Bezerra
Publikováno v:
Journal of Porphyrins and Phthalocyanines. :51-57
Optical self-defocusing, characterized by the non-linear refractive index n2, was investigated by the Z-scan technique in water solutions of two porphyrins (PPhs), negatively charged meso-tetrakis(p-sulfonatophenyl)porphyrin ( TPPS 4) and positively
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a743d7244fd9f32d32bf86826051c930
https://doi.org/10.1002/1099-1409(200101)5:1<51::aid-jpp296>3.0.co
https://doi.org/10.1002/1099-1409(200101)5:1<51::aid-jpp296>3.0.co
Publikováno v:
Chemical Physics Letters. 330:347-353
We report the use of the Z-scan method, which is a nonlinear optical technique, as a general method to determine a chemical parameter, the p K a , which characterizes the equilibrium constant in acid–base reactions. The measurements were performed
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ad209e38ab4da63e750df0044d69b7ac
https://doi.org/10.1016/s0009-2614(00)01108-8
https://doi.org/10.1016/s0009-2614(00)01108-8
Publikováno v:
Chemical Physics Letters. 318:511-516
Porphyrin metal complex derivatives were experimentally studied using the Z -scan technique and the optical Kerr gate method with picosecond pulses at 532 nm. The sign and magnitude of the nonlinear refraction and nonlinear absorption were determined
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7740678a009ad96134c7e81895a3f5f0
https://doi.org/10.1016/s0009-2614(00)00076-2
https://doi.org/10.1016/s0009-2614(00)00076-2
Publikováno v:
Optics express. 21(15)
A modified spatial filtering method that improves the sensitivity of single-beam and mode-mismatched thermal lens spectroscopy (TLS) for fluorescence quantum yield measurement is presented. The method is based on the detection of the external part of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::138bc94535afbd0278610ac4e377f71c
https://pubmed.ncbi.nlm.nih.gov/23938731
https://pubmed.ncbi.nlm.nih.gov/23938731
Publikováno v:
Nonlinear Optics.
We present a thermally managed pump-probe Z-scan technique to characterize the nonthermal third-order optical nonlinearities of photonic materials using continuum lasers, allowing to obtain nonthermal nonlinear refraction index values probing with lo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::48855caca781b508604f9519591d4edc
https://doi.org/10.1364/nlo.2013.nw4a.31
https://doi.org/10.1364/nlo.2013.nw4a.31
Autor:
R. E. de Araujo, Ludmila Barbosa
Publikováno v:
2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011).
This paper shows the viability of using inexpensive continuous light sources on Optical Coherence Tomography. Incandescent lamp and sunlight were applied to develop an imaging system with 2 μm of resolution (2 times better than ones commercially ava
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::109d4732bed3ef9231424ed6aa52f0e5
https://doi.org/10.1109/imoc.2011.6169343
https://doi.org/10.1109/imoc.2011.6169343