Model kinetics of surface relief gratings formation in organic thin films: experimental and Monte Carlo studies

Pawlik, Grzegorz; Kordas, Wojciech; Mituś, Antoni C.; Sahraoui, B.; Czaplicki, Robert; Kajzar, F.

doi:10.1117/12.737604

Cited by 3 publications

(2 citation statements)

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“…In this case a photoisomerization act grants an additional nonthermal trial MC move of neighboring monomer/s. Preliminary results in the two-dimensional case published recently 49 and previous studies 50 clearly indicate that isomerization changes the character of the diffusion of the chain as a whole.…”

Section: Discussionmentioning

confidence: 57%

Complex Dynamics of Photo-Switchable Guest Molecules in All-Optical Poling Close to the Glass Transition: Kinetic Monte Carlo Modeling

2018

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We study theoretically the kinetics of noninteracting photoswitchable guest molecules (model azo-dye) dispersed at low concentration in host (model polymer matrix) in the all-optical poling process close to the glass transition temperature T. We modify kinetic Monte Carlo model used in our previous studies of nonlinear optical processes in host-guest systems. The polymer matrix is simulated using the bond-fluctuation model. The kinetics of multiple trans-cis-trans cycles is formulated in terms of transition probabilities which depend on local free volume in the matrix and its dynamics. Close to T, the buildup of polar order, monitored in terms of angular probability density functions, follows a power-law in time while the evolution of the nonlinear susceptibilities related to second harmonic generation effect follows the stretched-exponential law. This complex dynamics of guest molecules implies the presence of dynamic heterogeneities of the matrix in space and time which spread the complexity from the matrix to the otherwise simple dynamics of noninteracting guest molecules. A qualitative physical picture of mosaic-like states-intertwined areas of free- and hindered angular motion of guest molecules-is proposed and the role of related short and longer scales in space for the promotion of complex dynamics of guest molecules is discussed. A brief comparison of the theory to available experimental data is given.

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Section: Discussionmentioning

confidence: 57%

Complex Dynamics of Photo-Switchable Guest Molecules in All-Optical Poling Close to the Glass Transition: Kinetic Monte Carlo Modeling

2018

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“…Typically, SRG have a period in the range of micrometers and a modulation depth of a few hundreds of nanometers, meaning that the motion takes place at a scale several orders of magnitude higher than that of the photochromic molecule alone (Figure c). The grating spacing Λ g can be modulated by tuning the incident angle θ of the interfering beams at a wavelength λ, following the equation: Even if SRG are widely explored in the literature, the mechanism of their formation is still under debate. ,− Briefly, two main ideas are usually opposed: (i) the photofluidization concept and (ii) the alignment effect. For the former, it is suggested that the continuous trans → cis and cis → trans isomerization processes soften the polymer matrix around the photochromic molecules like a thermal fluidization.…”

Section: Motion From Photochromic Molecular Switchesmentioning

confidence: 99%

Design of Collective Motions from Synthetic Molecular Switches, Rotors, and Motors

et al. 2019

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Precise control over molecular movement is of fundamental and practical importance in physics, biology, and chemistry. At nanoscale, the peculiar functioning principles and the synthesis of individual molecular actuators and machines has been the subject of intense investigations and debates over the past 60 years. In this review, we focus on the design of collective motions that are achieved by integrating, in space and time, several or many of these individual mechanical units together. In particular, we provide an in-depth look at the intermolecular couplings used to physically connect a number of artificial mechanically active molecular units such as photochromic molecular switches, nanomachines based on mechanical bonds, molecular rotors, and light-powered rotary motors. We highlight the various functioning principles that can lead to their collective motion at various length scales. We also emphasize how their synchronized, or desynchronized, mechanical behavior can lead to emerging functional properties and to their implementation into new active devices and materials.

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Functionalized polymers with strong push-pull azo chromophores in side chain for optical application

et al. 2018

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Model kinetics of surface relief gratings formation in organic thin films: experimental and Monte Carlo studies

Cited by 3 publications

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Complex Dynamics of Photo-Switchable Guest Molecules in All-Optical Poling Close to the Glass Transition: Kinetic Monte Carlo Modeling

Complex Dynamics of Photo-Switchable Guest Molecules in All-Optical Poling Close to the Glass Transition: Kinetic Monte Carlo Modeling

Design of Collective Motions from Synthetic Molecular Switches, Rotors, and Motors

Functionalized polymers with strong push-pull azo chromophores in side chain for optical application

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