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.

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...

scholarly journals Ultrafast sub–30-fs all-optical switching based on gallium phosphide

2019 ◽  
Vol 5 (6) ◽  
pp. eaaw3262 ◽  
Author(s):  
Gustavo Grinblat ◽  
Michael P. Nielsen ◽  
Paul Dichtl ◽  
Yi Li ◽  
Rupert F. Oulton ◽  
...  
Keyword(s):  
Gallium Phosphide ◽  
Optical Switching ◽  
Near Infrared ◽  
Optical Nonlinearity ◽  
Photon Absorption ◽  
Linear Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
All Optical ◽  
All Optical Switching

Gallium phosphide (GaP) is one of the few available materials with strong optical nonlinearity and negligible losses in the visible (λ > 450 nm) and near-infrared regime. In this work, we demonstrate that a GaP film can generate sub–30-fs (full width at half maximum) transmission modulation of up to ~70% in the 600- to 1000-nm wavelength range. Nonlinear simulations using parameters measured by theZ-scan approach indicate that the transmission modulation arises from the optical Kerr effect and two-photon absorption. Because of the absence of linear absorption, no slower free-carrier contribution is detected. These findings place GaP as a promising ultrafast material for all-optical switching at modulation speeds of up to 20 THz.

Preparation and Photophysical Properties of All-trans Acceptor–π-Donor (Acceptor) Compounds Possessing Obvious Solvatochromic Effects

2017 ◽  
Vol 70 (9) ◽  
pp. 1048
Author(s):  
Yu-Lu Pan ◽  
Zhi-Bin Cai ◽  
Li Bai ◽  
Sheng-Li Li ◽  
Yu-Peng Tian
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Photophysical Properties ◽  
Emission Spectra ◽  
Photon Absorption ◽  
Linear Absorption ◽  
Functional Theory ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Donor Acceptor

A series of all-trans acceptor–π-donor (acceptor) compounds (BAQ, SFQ, BLQ, and XJQ) were conveniently synthesised and characterised by infrared, nuclear magnetic resonance, mass spectrometry, and elemental analysis. Their photophysical properties, including linear absorption, one-photon excited fluorescence, two-photon absorption, and two-photon excited fluorescence, were systematically investigated. All the compounds show obvious solvatochromic effects, such as significant bathochromic shifts of the emission spectra and larger Stokes shifts in more polar solvents. Under excitation from a femtosecond Ti : sapphire laser with a pulse width of 140 fs, they all exhibit strong two-photon excited fluorescence, and the two-photon absorption cross-sections in THF are 851 (BAQ), 216 (SFQ), 561 (BLQ), and 447 (XJQ) GM respectively. A combination of density functional theory (DFT) and time-dependent density functional theory (TDDFT) approaches was used to investigate the relationships between the structures and the photophysical properties of these compounds. The results show that they may have a potential application as polarity-sensitive two-photon fluorescent probes.

Multiphoton Spectra of Conjugated Polymers

1992 ◽  
Vol 247 ◽  
Author(s):  
Z. G. Soos ◽  
S. Etemad ◽  
R. G. Kepler
Keyword(s):  
Conjugated Polymers ◽  
Internal Standard ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Transfer Integrals ◽  
Atomic Limit ◽  
Interacting Electrons ◽  
Photon Spectra ◽  
Lattice Limit

ABSTRACTMultiphoton excitations of conjugated polymers are related to their optical gap, Eg, which serves as an internal standard. In π-electron models with electron-hole symmetry, the alternation gap Ea is the lowest-energy two-photon absorption (TPA) and increases with the alternation δ of the transfer integrals t(l ± δ) along the backbone. Increasing electron-electron (e-e) correlations shift an intense TPA from 2Eg in the band limit to Eg in the atomic limit. Two-photon spectra and multiphoton resonances in polyenes, polydiacetylenes, and polysilanes are related to interacting electrons in Pariser-Parr-Pople(PPP) models with increasing alternation and either carbon or silicon e-e interactions. Some general features of correlated states of conjugated polymers are discussed in the rigid-lattice limit.

Novel s-tetrazine-based dyes with enhanced two-photon absorption cross-section

2015 ◽  
Vol 3 (32) ◽  
pp. 8351-8357 ◽  
Author(s):  
Cassandre Quinton ◽  
San-Hui Chi ◽  
Cécile Dumas-Verdes ◽  
Pierre Audebert ◽  
Gilles Clavier ◽  
...  
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Photon Absorption ◽  
Absorption Cross ◽  
Absorption Properties ◽  
Linear Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Non Linear

This paper reports the synthesis and the linear and non-linear absorption properties of a series of new tetrazine-based D–π–A–π–D and D–π–A type dyes.

scholarly journals Intrinsic five-photon non-linear absorption of two-dimensional BN and its conversion to two-photon absorption in the presence of photo-induced defects

2018 ◽  
Vol 86 ◽  
pp. 414-420 ◽  
Author(s):  
Yongchang Dong ◽  
Prakash Parajuli ◽  
Apparao M. Rao ◽  
Wim Thielemans ◽  
Samuel Eyley ◽  
...  
Keyword(s):  
Photon Absorption ◽  
Two Dimensional ◽  
Linear Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Non Linear ◽  
Induced Defects

scholarly journals Theoretical modeling of two-photon absorption of benzoxazoles exhibiting excited state proton transfer

2018 ◽  
Vol 26 (2) ◽  
pp. 55-58
Author(s):  
Y. Syetov
Keyword(s):  
Absorption Spectra ◽  
Cross Section ◽  
Cross Sections ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Photon Absorption ◽  
Linear Absorption ◽  
Functional Theory ◽  
Two Photon Absorption ◽  
Two Photon

Two-photon absorption spectra of 2-(2'-hydroxyphenyl)benzoxazole, 2,5-bis(2-benzoxazolyl)phenol and 2,5-bis(2-benzoxazolyl)hydroquinone are modeled by time-dependent density functional theory calculations. In contrast to the linear absorption, where the transitions to the two lowest excited states are leading, the two-photon absorption cross sections are significant for the transitions to higher states which are weak in one-photon absorption spectra. The 2,5-bis(2-benzoxazolyl)phenol and 2,5-bis(2-benzoxazolyl)hydroquinone demonstrate the maximum cross section of about ten times larger than that of 2-(2'-hydroxyphenyl)benzoxazole. The largest value of the cross section is calculated for 2,5-bis(2-benzoxazolyl)hydroquinone to be about 1500 units of Goeppert-Mayer for excitation at 600 nm.

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