Výsledky vyhledávání - "Marcelo G. Vivas"

Size-dependent photoinduced transparency in colloidal CdTe quantum dots in the strong confinement regime: an inverse linear relationship

Autor: Carlos H. D. Dos Santos, Diego L. Ferreira, Leandro H. Zucolotto Cocca, Rafael S. Mourão, Marco A. Schiavon, Cleber R. Mendonça, Leonardo De Boni, Marcelo G. Vivas

Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP

Nanomaterials have been investigated as saturable absorbers for ultrafast lasers because of their large photoinduced transparency related to ground-state bleaching. However, the quantum dot size effect on the photoinduced transparency in the strong c

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9a12fc98af261457a39a3ac9496611c7

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Photobleaching Kinetics of MEH-PPV in Solution: The Role of Conformational Disorder

Autor: Marcelo G. Vivas, Michelle Leifeld Raicoski

Publikováno v: The Journal of Physical Chemistry B. 125:9887-9894

Semiconductor polymers are the foundation of organic electronics due to their remarkable optical features, ability to form a thin film, and low cost compared to silicon. However, some of them have intense photobleaching under UV-blue radiation, compr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6d287c89e042793ddee4c533141c4d85
https://doi.org/10.1021/acs.jpcb.1c05498

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Efficient Yet Accessible Arduino-based Control System for Laser Microfabrication of Photonic Platforms

Autor: Luis Ricardo Mucciaroni, Marcelo G. Vivas

Publikováno v: Lasers in Manufacturing and Materials Processing. 8:395-408

Laser Microfabrication (LMF) has been widely employed in a broad range of applications based on linear and nonlinear optics phenomena. Thus, this work aims to develop an Arduino-controlled low-cost LMF setup with high quality and precision. The LMF s

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4db44bbfb5cd6b4732c3ef1adfeef81f
https://doi.org/10.1007/s40516-021-00153-3

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Fluorescent chitosan nanoparticles as a carrier system for trackable drug delivery

Autor: Maria Gabriela Nogueira Campos, Marcelo G. Vivas, Andreia Carvalho Padilha, Maria do Socorro Fernandes Melo

Publikováno v: Polymer-Plastics Technology and Materials. 60:862-871

Chitosan (CS) is a biopolymer that presents remarkable biomedical applications. Here we report on the fluorescence study of water-soluble CS nanoparticles obtained by hydrothermal treatment at diff...

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4b3ddeabb9bac07f9143a7df976e06d0
https://doi.org/10.1080/25740881.2020.1867169

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Determination of linear and nonlinear optical properties of branched polyfluorenes in function of effective electron number

Autor: Leandro H. Zucolotto Cocca, André Gasparotto Pelosi, Luis M. G. Abegão, Chantal Andraud, Cleber R. Mendonça, Marcelo G. Vivas, Leonardo De Boni

Publikováno v: Latin America Optics and Photonics (LAOP) Conference 2022.

We determine the two-photon absorption (2PA) cross section spectra branched polyfluorenes distinguished by the number of fluorenes and chemical architecture. Moreover, the optical properties were determined in function of the effective electrons numb

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6b4e49087790e34b10264da9df8de4dd
https://doi.org/10.1364/laop.2022.tu4a.55

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Effective π-electron number and symmetry perturbation effect on the two-photon absorption of oligofluorenes

Autor: Jean-Christophe Mulatier, Leandro H. Z. Cocca, Marcelo G. Vivas, Leonardo De Boni, Chantal Andraud, Lino Misoguti, Delphine Pitrat, Cleber Renato Mendonça, Luis M. G. Abegão

Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP

Fluorene-based molecules exhibit significant nonlinear optical responses and multiphoton absorption in the visible region, which, combined with the high fluorescence quantum yield in organic solvents, could make this class of materials potentially en

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e4c010402f66d0bbfcaea3d83159bf47
https://pubmed.ncbi.nlm.nih.gov/34612397

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Molecular structure-optical property relationship of salicylidene derivatives: a study on the first-order hyperpolarizability

Autor: Leonardo De Boni, Cristina A. Barboza, Teresa D. Z. Atvars, José Carlos Germino, D. L. Silva, Marcelo G. Vivas, Pedro A. M. Vazquez, Ruben D. Fonseca, Cleber Renato Mendonça

Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP

The first-order hyperpolarizability of π-conjugated organic molecules is of particular interest for the fabrication of electro-optical modulators. Thus, we investigated the relationship between the molecular structure and the incoherent second-order

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::39171c7dab0f5bc74e7266b8371e644d

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Probing the high performance of photoinduced birefringence in V-shaped azo/PMMA guest-host films

Autor: Chantal Andraud, Yann Bretonnière, Marcelo G. Vivas, Lidiana M. Silva, Mariana V. Boas, D. L. Silva

Publikováno v: RSC advances. 10(67)

Optical birefringence in polymeric films containing azo-chromophores is an important feature related to the development of several technologies such as electro-optic modulators, optical switching, and optical gates, to cite a few. Therefore, it is es

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1f2f78b5390a071d025bdbd0108ac3c3
https://pubmed.ncbi.nlm.nih.gov/35519213

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Probing the Strong Near-IR Two-Photon Transition in Supramolecular Triphenylamine-based Polymers by Nonlinear Absorption Spectroscopy

Autor: Marcelo G. Vivas, Leonardo De Boni, Cleber Renato Mendonça, J. Dipold, J. P. Siqueira, Guy Koeckelberghs

Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP

Due to their capability of film formation and remarkable optical features, semiconductor polymers with high two-photon absorption (2PA) have been studied as potential candidates for the development of organic photonic platforms. Furthermore, there is

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8eba965fa190d3dfebbf3d299000780e
https://pubmed.ncbi.nlm.nih.gov/32539394

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