Efficient Nonlinear Absorbing Platinum(II) Acetylide Chromophores in Solid PMMA Matrices

Westlund, Robert; Malmström, Eva; Lopes, Cesar; Öhgren, Johan; Rodgers, Thomas; Saito, Yuika; Kawata, Satoshi; Glimsdal, Eirik; Lindgren, Mikael

doi:10.1002/adfm.200800265

Cited by 56 publications

(89 citation statements)

References 48 publications

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“…[46,271] Comparison between polymer matrices (often polymethylmethacrylate PMMA) and sol-gel matrices evaluated for both second and third order nonlinearities are often in favor of the siloxane chains that usually show a higher stability combined with good optical properties. [277][278][279][280] Numerous work reported the influence of the grafting and the matrix composition on the nonlinear optical performances. Even if large amount of work were reported since the early 90's, there is still a tendency to improve the properties and evaluate the process parameters and the impact on the NLO, without real breakthrough in terms of SHG values.…”

Section: Q10mentioning

confidence: 99%

Optical Properties of Hybrid Organic‐Inorganic Materials and their Applications

Parola

Julián‐López

Carlos

et al. 2016

Adv Funct Materials

248

116

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Research on hybrid inorganic‐organic materials has experienced an explosive growth since the 1980s, with the expansion of soft inorganic chemistry based processes. Indeed, mild synthetic conditions, low processing temperatures provided by “chimie douce” and the versatility of the colloidal state allow for the mixing of the organic and inorganic components at the nanometer scale in virtually any ratio to produce the so called hybrid materials. Today a high degree of control over both composition and nanostructure of these hybrids can be achieved allowing tunable structure‐property relationships. This, in turn, makes it possible to tailor and fine‐tune many properties (mechanical, optical, electronic, thermal, chemical…) in very broad ranges, and to design specific multifunctional systems for applications. In particular, the field of “Hybrid‐Optics” has been very productive not only scientifically but also in terms of applications. Indeed, numerous optical devices based on hybrids are already in, or very close, to the market. This review describes most of the recent advances performed in this field. Emphasis will be given to luminescent, photochromic, NLO and plasmonic properties. As an outlook we show that the controlled coupling between plasmonics and luminescence is opening a land of opportunities in the field of “Hybrid‐Optics”.

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Section: Q10mentioning

confidence: 99%

Optical Properties of Hybrid Organic‐Inorganic Materials and their Applications

Parola

Julián‐López

Carlos

et al. 2016

Adv Funct Materials

248

116

View full text Add to dashboard Cite

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“…This scheme is known as the self-consistent field method and is summarized in Figure 3. 1. In practice, the convergence criterion is weaker than that the initial and resulting electron densities should be equal, requiring only that they differ by less than some predefined value.…”

Section: The Self-consistent Field Methodsmentioning

confidence: 99%

“…This scheme is illustrated in Figure 8. 1. What constitutes a long enough simulation time and a large enough sample size depends on the system that is under study.…”

Section: Molecular Dynamics Samplingmentioning

confidence: 99%

Light interactions in flexible conjugated dyes

Sjöqvist¹

2014

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In this thesis methodological developments have been made for the description of flexible conjugated dyes in room temperature spectrum calculations. The methods in question target increased accuracy and efficiency by combining classical molecular dynamics (MD) simulations with time-dependent response theory spectrum calculations.For absorption and fluorescence spectroscopies a form of conformational averaging is used, where the final spectrum is obtained as an average of spectra calculated for geometries extracted from ground and excited state MD simulations. For infrared and Raman spectroscopies averaged spectra are calculated based on individual spectra, obtained for zero-temperature optimized molecular structures, weighted by conformational statistics from MD trajectories. Statistics for structural properties are also used in both cases to gain additional information about the systems, allowing more efficient utilization of computational resources. As it is essential that the molecular mechanics description of the system is highly accurate for methods of this nature to be effective, high quality force field parameters have been derived, describing the molecules of interest in either the MM3 or CHARMM force fields.These methods have been employed in the study of three systems. The first is a platinum(II) actylide chromophore used in optical power limiting materials, for which a ultraviolet/visible absorption spectrum has been calculated. The second is a family of molecular probes called luminescent conjugated oligothiophenes (LCOs), used to detect and characterize amyloid proteins, for which both absorption and fluorescence spectra have been calculated. Finally, infrared and Raman spectra have been calculated for a group of branched oligothiophenes used in organic solar cells.In addition, solvation effects have been studied for conjugated polyeletrolytes in water, resulting in the development of two solvation models suitable for this class of molecules. The first uses a quantum mechanics/molecular mechanics (QM/MM) description, in which the solute molecule is described using accurate quantum mechanical methods while the surrounding water molecules are described using point charges and polarizable point dipoles. The second discards the water entirely and removes the ionic groups of the solute. The QM/MM model provides highly accurate results while the cut-down model gives results of slightly lower quality but at a much reduced computational cost.Finally, a study of protein-dye interactions has been performed, with the goal of explaining changes in the luminescence properties of the LCO chromophores when in the presence of amyloid proteins. Results were less than conclusive. I I I Populärvetenskaplig sammanfattningKvantmekanik ger en teoretisk grund som med enkla samband hjälper oss beskriva den värld vi lever i. Praktisk sett är det dock inte fullt så enkelt, då det krävs en lång rad förenklingar innan det ens går att utföra beräkningar på några få atomer. De system vi är intresserade av kan innehålla t...

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“…Chromophore doping of glasses can be characterized into two classes, either Class 1 where the dye molecules are embedded in the glass matrix or Class 2 where the chromophores are covalently bound to the matrix [52]. Class 1 materials have shown better clamping level performance than Class 2 materials, but puts requirements on solubility of the chromophore into the glass matrix [1,52].…”

Section: Sol-gel Glassesmentioning

confidence: 99%

“…[14,47,52]. It is known for its good mechanical properties [47,52]. Bulk PMMA has been both Class 1 and 2 doped with high concentrations of PE2 derivatives [52].…”

Section: Sol-gel Glassesmentioning

confidence: 99%

Sol-Gel Glasses Doped with Pt-Acetylides and Gold Nanoparticles for Enhanced Optical Power Limiting

Lundén¹

2017

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High power laser pulses can be a threat to sensors, including the human eye. Traditionally this threat has been alleviated by colour filters that blocks radiation in chosen wavelength ranges. Colour filters' main drawback is that they block radiation regardless of it being useful or damaging, information is removed for wavelengths at which the filter protect. Protecting the entire wavelength range of a sensor would block or strongly attenuate the radiation needed for the operation of the sensor.Sol-gel glasses highly doped with Pt-Acetylide chromophores have previously shown high optical quality in combination with efficient optical power limiting through reverse saturable absorption 1 . These filters will transmit visible light unless the light fluence is above a certain threshold. A key design consideration of laser protection filters is linear absorption in relation to threshold level. By increasing chromophore concentration the threshold is lowered at the expense of higher linear absorption. This means that the user's view is degraded through the filter.Adding small amounts of gold nanoparticles to the glasses resulted in an increase in optical power limiting performance. The optimal concentration of gold nanoparticles corresponded to a mean particle distance of several micrometers. The work in this licentiate thesis is about the characterization and explanation of this effect.The glasses investigated in this work were MTEOS Sol-Gel glasses doped with either only gold nanoparticles of varying shape and concentration, 50 mM of PE2-CH 2 OH codoped with gold nanoparticles or 50 mM of PE3-CH 2 OH codoped with gold nanoparticles. The glasses only doped with gold nanoparticles showed high optical power limiting performance at 532 nm laser wavelength, but no optical power limiting at the fluences tested at 600 nm. The PE2-CH 2 OH glasses codoped with gold nanoparticles showed an enhancement of optical power limiting at 600 nm for the low gold nanoparticle concentration glasses. The enhancement was weak-1 Standard nomenclature, see section 1.3.3.iii iv ened or not present for higher concentrations. A similar enhancement above noise level for the PE3-CH 2 OH glasses was not found.A population model is used to give a qualitative explanation of the findings. The improvement in optical power limiting performance for the PE2-CH 2 OH glasses is explained by the gold nanoparticles helping to more quickly populate the highly absorbing triplet state during the rising edge of the laser pulse by enhancing two-photon absorption. The lack of any marked enhancement for the PE3-CH 2 OH glasses is explained by the PE3-CH 2 OH chromophore already being of sufficiently high performance to quickly populate the highly absorbing triplet state during the rising edge of the laser pulse. Further work is necessary to validate this model against other chromophores and improving its quantitative predictive power. Populärvetenskaplig sammanfattningLaserpulser med hög effekt kan vara ett hot mot sensorer, inklusive människoögat. Traditi...

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Efficient Nonlinear Absorbing Platinum(II) Acetylide Chromophores in Solid PMMA Matrices

Cited by 56 publications

References 48 publications

Optical Properties of Hybrid Organic‐Inorganic Materials and their Applications

Optical Properties of Hybrid Organic‐Inorganic Materials and their Applications

Light interactions in flexible conjugated dyes

Sol-Gel Glasses Doped with Pt-Acetylides and Gold Nanoparticles for Enhanced Optical Power Limiting

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