Ivan A. Mikhailov

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Two-photon absorption (2PA) and subsequent processes may be localized in space with a tightly focused laser beam. This property is used in a wide range of applications, including three dimensional data storage. We report theoretical studies of 5 conjugated chromophores experimentally shown to have large 2PA cross-sections. We use the Time Dependent Density(More)
Method Development We developed two new methods for theoretical design of organic photoswitching molecules: (i) ATDA: a posteriori Tamm-Dancoff approximation to the second order time-dependent density functional theory (TD-DFT), that allows one to account for double excitations and to predict permanent and state-to-state transition dipole moments, and (ii)(More)
Photochromic compounds are promising materials for optoelectronic and photonic applications because of their ability to undergo change in color under UV/Vis illumination due to reversible chemical transition from open to closed ring isomers (photocyclization). The by-produc formation may lead to irreversible photodegradation of the material, called fatigue.(More)
Certain organic compounds posess the ability to change color under the influence of light, called photochromism. This change is often due to ultrafast chemical transition from open to closed ring isomers (photocyclization). Information thechnology applications of these photochromics require the reverse transformation to be very slow in the dark. We have(More)
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