Effective π-electron number and Symmetry Perturbation Effect on the Two-photon Absorption of Oligofluorenes

2021 ◽  
Author(s):  
Luis M.G. Abegão ◽  
Leandro Cocca ◽  
Jean-Christophe Mulatier ◽  
Delphine Pitrat ◽  
Chantal Andraud ◽  
...  
Keyword(s):  
Fluorescence Quantum Yield ◽  
Photon Absorption ◽  
Multiphoton Absorption ◽  
Electron Number ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Optical Responses ◽  
High Fluorescence ◽  
Perturbation Effect ◽  
High Fluorescence Quantum Yield

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

MULTIPHOTON EFFECTS IN THE POLYDIACETYLENE POLY BIS(P-TOLUENE SULFONATE) OF 2,4-HEXADIYNE-1,6-DIOL (PTS)

2000 ◽  
Vol 09 (01) ◽  
pp. 95-104 ◽  
Author(s):  
FUMIYO YOSHINO ◽  
SERGEY POLYAKOV ◽  
LARS FRIEDRICH ◽  
MINGGUO LIU ◽  
HOON SHIM ◽  
...  
Keyword(s):  
Optical Quality ◽  
Photon Absorption ◽  
Multiphoton Absorption ◽  
Linear Absorption ◽  
High Optical Quality ◽  
Two Photon Absorption ◽  
Two Photon ◽  
A Value ◽  
Toluene Sulfonate ◽  
Photon Spectra

Multiphoton absorption was investigated in single crystals of the polymer poly bis(p-toluene sulfonate) of 2,4-hexadiyne-1,6-diol (PTS). Using modified growth and polymerization techniques, high optical quality crystals were grown and their linear absorption spectrum measured. Very large four-photon absorption was measured using Z-scan with a value of α4=0.3 cm 5/ GW 3 obtained at 1600 nm. From the known one and two-photon absorption spectra, the three- and four-photon spectra are predicted to overlap. This leads to three-photon enhanced, four-photon absorption which is interpreted as the mechanism responsible for such large four-photon absorption.

Recent progress in efficient organic two-photon dyes for fluorescence imaging and photodynamic therapy

2020 ◽  
Vol 8 (19) ◽  
pp. 6342-6349 ◽  
Author(s):  
Liang Xu ◽  
Junzheng Zhang ◽  
Lingfeng Yin ◽  
Xueting Long ◽  
Wenying Zhang ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Fluorescence Imaging ◽  
Fluorescence Quantum Yield ◽  
Organic Dyes ◽  
Photon Absorption ◽  
Generation Efficiency ◽  
Oxygen Generation ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Singlet Oxygen Generation

The enhancement of two-photon absorption cross-section, fluorescence quantum yield and singlet oxygen generation efficiency for organic dyes and their applications in two-photon excited fluorescence imaging and photodynamic therapy are summarized.

scholarly journals Nonlinear Optical Study in a Set of Dibenzylideneacetone Derivatives with Potential for Optical Frequency Conversion

Photonics ◽  
2020 ◽  
Vol 7 (1) ◽  
pp. 8
Author(s):  
Francisco A. Santos ◽  
Luis M. G. Abegão ◽  
Ruben D. Fonseca ◽  
Aline M. Alcântara ◽  
Cleber R. Mendonça ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Frequency Conversion ◽  
Molecular Structures ◽  
Photon Absorption ◽  
Optical Frequency ◽  
Two Photon Absorption ◽  
Optical Frequency Conversion ◽  
Two Photon ◽  
Optical Responses ◽  
Molecular Hyperpolarizability

The search for advanced optical materials, in particular, materials with nonlinear optical responses, has, in the last years, experienced substantial growth due to their vast applications in the photonics field. One of those applications is ultra-fast optical frequency conversion, in the optics communications field. Organic compounds have emerged as promising candidates for raw materials to develop nonlinear optical devices, such as optical converters, due to their intrinsic ultra-fast electronic responses. Also, the easy tailoring of organic molecular structures makes organic materials much more appealing than the inorganic ones. In this work, we have performed a linear and nonlinear optical characterization of a set of dibenzylideneacetone derivatives. The nonlinear optical responses investigated correspond to second- and third-order nonlinear processes, namely, first electronic molecular hyperpolarizability and two-photon absorption cross-section, respectively. The value of the first electronic molecular hyperpolarizability, up to 52 cm4·statvolt−1, could be considered a robust value when compared to the short-sized π-electron backbone length of the studied compounds. Such results suggest that these compounds exhibit the potential to be used as optical frequency converters. Quantum chemical calculations were used to predict the theoretical value of the first molecular hyperpolarizability, as well as to simulate the one- and two-photon absorption spectra for all compounds.

Synthesis of selenium nanoparticles and their nonlinear optical properties

2017 ◽  
Vol 26 (02) ◽  
pp. 1750016 ◽  
Author(s):  
A. Suslov ◽  
S. Bikorimana ◽  
P. Lama ◽  
V. Sukharenko ◽  
A. Walser ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Quartz Substrate ◽  
Selenium Nanoparticles ◽  
Photon Absorption ◽  
Nonlinear Susceptibility ◽  
Excitation Wavelength ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Optical Responses ◽  
Physical Deposition

Selenium nanoparticles were fabricated using a physical deposition method based on heterogeneous condensation. The Selenium nanoparticles were deposited on a quartz substrate and the ultrafast nonlinear optical responses were investigated by using the [Formula: see text]-scan technique. The nanosize films showed two-photon absorption and a large positive nonlinear refractive index at 800 nm excitation wavelength. The obtained real and imaginary parts of the intensity-dependent complex third-order nonlinear susceptibility of the Selenium nanoparticles ranged from [Formula: see text] to [Formula: see text] (esu) for different irradiance levels.

scholarly journals TWO-PHOTON ABSORPTION AND FLUORESCENCE WITH QUADRUPOLAR AND BRANCHED CHROMOPHORES—EFFECT OF STRUCTURE AND BRANCHING

2004 ◽  
Vol 13 (03n04) ◽  
pp. 451-460 ◽  
Author(s):  
LAURENT PORRÈS ◽  
OLIVIER MONGIN ◽  
CLAUDINE KATAN ◽  
MARINA CHARLOT ◽  
BHARATH KUMAR GOUD BHATTHULA ◽  
...  
Keyword(s):  
Cross Sections ◽  
Twist Angle ◽  
Photon Absorption ◽  
Phenylene Ethynylene ◽  
Photoluminescence Properties ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Femtosecond Regime ◽  
High Fluorescence ◽  
Branched Structure

The photophysical and two-photon absorption (TPA) properties of three homologous quadrupolar and one related three-branched chromophores were investigated. Design of the quadrupoles is based on the symmetrical functionalization of a biphenyl core. Modulation of the nonlinear absorptivity/transparency/photostability trade-off can be achieved by playing with the twist angle of the core and on the spacers (phenylene-vinylene versus phenylene-ethynylene). The quadrupolar chromophores combine high TPA cross-sections, high fluorescence quantum yield and solvent sensitive photoluminescence properties. The branched structure exhibits spectrally broadened TPA in the NIR region (up to 3660 GM at 740 nm measured in the femtosecond regime) but reduced sensitivity to the environment.

Second order interference in two photon absorption

1996 ◽  
Vol 43 (9) ◽  
pp. 1765-1771 ◽  
Author(s):  
M. W. HAMILTON and D. S. ELLIOTT
Keyword(s):  
Second Order ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon
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