Dispersion of the first molecular hyperpolarizability of charge-transfer chromophores studied by hyper-Rayleigh scattering

Woodford, Jeffrey N.; Wang, C. H.; Jen, Alex K.‐Y.

doi:10.1016/s0301-0104(01)00430-x

Cited by 29 publications

(19 citation statements)

References 21 publications

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“…38,39 Recently, Kelley's group presented a straightforward approach of spectrally dispersing by using a Raman spectrometer to detect both hyper-Raman and hyper-Rayleigh scattering. 30,40 Herein, the Placzek approximation to simplify the nonresonance terms by neglecting the vibrational frequencies is involved and results in the expression of dispersion of β value as 43 As an example, the normalized detecting spectra of pure solvent and two sample solutions were shown in Fig.…”

Section: A Wavelength Dependence Of βmentioning

confidence: 99%

“…In the most HRS spectrum measurement system, a CCD detector with instantaneous spectrum detection ability is used and possesses lower sensitivity than a photomultiplier tube (PMT) detector. 26,[30][31][32] In the early studies of two-photon resonant hyperpolarizabilities, the experimental data performed low signal-to-noise (S/N) ratio due to the contribution of two-photon fluorescence (TPF) and scattering of the fundamental laser beam. As well known, resonance enhancement is described as that the nonlinear optical properties (such as β and γ ) are enhanced when the excitation frequency is close to one or multiphoton resonance frequency.…”

Section: Introductionmentioning

confidence: 99%

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Two-photon resonant hyperpolarizability of an H-shaped molecule studied by wavelength-tunable hyper-Rayleigh scattering

Zhu

Lu²,

Cui³

et al. 2010

The Journal of Chemical Physics

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Wavelength dependent hyper-Rayleigh scattering measurements have been performed by using a fluorescence spectrometer. With this detection strategy, first molecular hyperpolarizability (β) of a dual charge-transfer (H-shaped) chromophore and its monomer have been measured in two-photon resonance range from 670 to 950 nm as well as at off-resonance of 1064 nm. The absorption and resonance hyper-Rayleigh profiles can be simulated reasonably well with a common set of parameters. In addition, both resonance and off-resonance results show that β(0) per chromophore has a remarkable enhancement for the H-shaped molecule as large as 1.7, compared with that of the monomer, which could be ascribed to two physical effects: (1) coherent enhancement of two chromophores and (2) intramolecular dipole-dipole interaction, which was confirmed by their fluorescence-decay behaviors.

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Section: A Wavelength Dependence Of βmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Two-photon resonant hyperpolarizability of an H-shaped molecule studied by wavelength-tunable hyper-Rayleigh scattering

Zhu

Lu²,

Cui³

et al. 2010

The Journal of Chemical Physics

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“…The TS model is very fruitful for theoretical study of NLO compounds, as it allows make the detailed analysis of electronic stucture of investigated chromophores, while the FF approach does not provide a microscopic interpretation of the obtained results. This model was modified to account for details expected to become important on or near resonance, including the finite lifetime of the charge-transfer state, inhomogeneous broadening and the vibronic structure of the electronic transition [17][18][19][20]. Evidently, there is value in using both FF and TS model calculation methods to obtain as full a picture as possible of the molecular hyperpolarizabilities of chromophores investigated here.…”

Section: )mentioning

confidence: 99%

Theoretical study of solvent effect on the structure, first electronic excited state, and nonlinear optical properties of substituted stilbazolium cations

Inerbaev

Mizuseki

2010

Int J of Quantum Chemistry

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Molecular structure, first excited state properties and charge distribution of a series of substituted stilbazolium cations in different media are theoretically investigated. First static hyperpolarizability (β 0 ) of considered compounds is studied by both finite-field and two-state model methods. In contrast to the recent theoretical studies, in present contribution the mutually consistent description of solvent polarity dependence of β 0 calculated by both employed approaches is achieved. It is shown that the ground-to-excited state intramolecular charge-transfer is significantly affected by the solvent that provides the hyperpolarizability variation. Taking into account both solvent polarity and substituent effect the peculiarities of β 0 behavior of stilbazolium derivatives are re-examined. The effect of molecular geometry on the calculated electronic excitation properties is investigated.

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“…The structural flexibility of organic compounds is an asset for materials with optimised second order NLO susceptibility, fast response and tailor made flexibility [5]. An innumerable of organic crystals are synthesized and grown in this fashion [6][7][8][9][10][11]. One of the obvious requirements for nonlinear crystal is that it should have excellent optical quality.…”

Section: Introductionmentioning

confidence: 99%

Studies on the Synthesis, Growth and Characterization of ([Paranitrophenyl]Imino)Benzene NLO Crystal by Sankaranarayanan-Ramasamy Method

Anbarasu¹,

Kumar²,

Devarajan³

2013

JMMCE

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The study of imine-bridged organics has been the hot spot synthesis of second order nonlinear optical (SONLO) and photo-responsive materials in recent years. Herein we present a study of synthesis, growth, and characterization of ([paranitrophenyl]imino)benzene (PNPIB) NLO single crystal. The title compound was synthesized in one step by Schiff base formation. <110> PNPIB single crystal of diameter of 40 mm and length 50 mm was successfully grown by SR method using a seed as the nucleus. The growth rate formula is derived for the SR method. PNPIB single crystals of 10 mm diameter and 60 mm height have been grown at an average growth rate of 3 mm per day from the point seed in a glass crystallizer. Almost 100% stable crystal conversion efficiency was achieved. The as grown PNPIB crystals were characterized using single crystal X-ray diffraction (XRD), X-ray powder diffraction (XRPD), Fourier Transform Infrared (FTIR), Ultraviolet-Visible-Near Infrared (UV-Vis-NIR), 1 H & 13C NMR spectral studies, dielectric measurement and NLO studies. Single crystal XRD analysis confirms that the grown ingot belongs to the space group of P 2 of monoclinic system thus exhibiting noncentrosymmetric structure. The crystalline perfection was assessed by XRPD. The powder diffraction pattern of the grown crystal has been indexed. The presence of C=N bond with intramolecular hydrogen bonding and the protonation of ions were confirmed by FTIR analysis. The UV-Vis-NIR spectrum of the crystal shows that the crystal has a cut-off at 298 nm. The 1 H & 13 C NMR spectra confirm the molecular structure. The dielectric behaviour was measured in the frequency range 1 KHz -10 KHz for the temperature range from 30˚C to 170˚C. The slight decrease in dielectric constant has been observed as the frequency is increased and the dielectric loss is very low for the entire frequency range. The second harmonic generation (SHG) in the crystal was observed by Kurtz powder technique.

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Dispersion of the first molecular hyperpolarizability of charge-transfer chromophores studied by hyper-Rayleigh scattering

Cited by 29 publications

References 21 publications

Two-photon resonant hyperpolarizability of an H-shaped molecule studied by wavelength-tunable hyper-Rayleigh scattering

Two-photon resonant hyperpolarizability of an H-shaped molecule studied by wavelength-tunable hyper-Rayleigh scattering

Theoretical study of solvent effect on the structure, first electronic excited state, and nonlinear optical properties of substituted stilbazolium cations

Studies on the Synthesis, Growth and Characterization of ([Paranitrophenyl]Imino)Benzene NLO Crystal by Sankaranarayanan-Ramasamy Method

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