Light-controlled vector polyphotochromism

Photoanisotropy in polarization-sensitive polymer materials based on the media with covalently-bonded components

“…A further increase in exposure leads to increase in n Δ and, accordingly, to increase in the path difference, which in turn results in interference quenching and in case the path difference is equals to wavelength the probing beam is totally quenched. 11 It must be emphasized that in this case the value of photoanisotropy is actually increased although the intensity of the probing beam is reduced.…”

“…Thus, we have supposed that this phenomenon is related to the interference quenching of probing beam, which occurs as a result of the path difference between the ordinary and extraordinary rays when the probing beam passes through the exposed sample. 11 The value of the path difference depends on the photoelastic coefficient of the material and the thickness of the photosensitive layer for given exposure. As a result of the selective absorption of a quantum of inducing linearly polarized light the chromophore molecule undergoes trans-cis isomerization, which in turn leads to the appearance of ordered microstrains in polymer matrix of the material.…”

“…[4][5][6][7][8][9][10] Unlike this in some high-efficient polarization-sensitive materials obtained by us, we have observed the anomalous kinetics of photoanisotropy induction after reaching its maximum value when material is exposed by actinic linearly polarized radiation and simultaneously is probed by monochromatic nonactinic linearly polarized light beam. [11][12][13] After reaching the maximum the intensity of the transmitted probing beam starts decreasing with radiant exposure of inducing light increasing and almost reaches zero for the given wavelength of the probing beam ( Figure 1, curve 2). The intensity of the probing beam passing through the exposed material essentially depends on radiant exposure of the inducing light, on a wavelength of the probing beam and on the thickness of the emulsion layer.…”

“…The intensity of the probing beam passing through the exposed material essentially depends on radiant exposure of the inducing light, on a wavelength of the probing beam and on the thickness of the emulsion layer. It was shown [11][12][13] that this phenomenon has the purely vector nature because the transmission of the material during probing by nonpolarized light is practically unchanged at different radiant exposures. However, an essential change in transmission was observed under probing the sample by linearly polarized nonactinic light.…”

Современное Состояние Разработки Светочувствительных Сред Для Голографии (Обзор)

“…Детальное исследование эффективности фотоанизо-тропии водорастворимых азокрасителей в зависимости от компонентного состава регистрирующей среды по-казало, что она возрастает при ионном взаимодействии между азокрасителем и полимером, в частности поливи-нипирролидоном XXIII [131].…”