Reversible supramolecular chiral structures induced in azopolymers by elliptically polarized light: influence of the irradiation wavelength and intensity

Blaga Blagoeva; Lian Nedelchev; Dimana Nazarova; Elena Stoykova; Joongki Park

doi:10.1364/AO.444159

Applied Optics
Vol. 61,
Issue 5,
pp. B147-B155
(2022)
•https://doi.org/10.1364/AO.444159

Reversible supramolecular chiral structures induced in azopolymers by elliptically polarized light: influence of the irradiation wavelength and intensity

Blaga Blagoeva, Lian Nedelchev, Dimana Nazarova, Elena Stoykova, and Joongki Park

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Blaga Blagoeva, Lian Nedelchev, Dimana Nazarova, Elena Stoykova, and Joongki Park, "Reversible supramolecular chiral structures induced in azopolymers by elliptically polarized light: influence of the irradiation wavelength and intensity," Appl. Opt. 61, B147-B155 (2022)

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Abstract

Photoinduced supramolecular chiral structures in azo materials have been extensively studied for the development of all-optical switches and because of their influence on the properties of certain types of polarization holographic gratings. Here, we investigate chiral structures induced by irradiation with elliptically polarized light in thin films of four azopolymers denoted as PAZO, ${{\rm P}_1}$, ${{\rm P}_{1 - 2}}$, which are amorphous, and ${{\rm P}_2}$, which is liquid crystalline. Their formation is characterized in real time by the kinetics of azimuth rotation. The influence of the irradiation wavelength and intensity is also analyzed. The largest azimuth rotation per unit thickness is achieved in PAZO (33°/µm) and ${{\rm P}_{1 - 2}}$ (25°/µm). Reversibility of the chiral structures is demonstrated by a tenfold change in the direction of rotation. Our results also indicate that chiral structures formation occurs significantly faster than the induction of linear birefringence.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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	PAZO ( $e_{i n} = 0.6$ )				P_1-2 ( $e_{i n} = 0.6$ )
$I [{m W / c m}^{2}]$	$Δ θ$ [°]	$d$ [µm]	$Δ θ / d$ [°/µm]	$τ$ [s]	$Δ θ$ [°]	$d$ [µm]	$Δ θ / d$ [°/µm]	$τ$ [s]
25	$28.1 \pm 0.3$	$0.845 \pm 0.005$	$33.2 \pm 0.4$	$75 \pm 7$	$15.9 \pm 0.3$	$0.640 \pm 0.005$	$25.0 \pm 0.3$	$23 \pm 2$
90	$31.2 \pm 0.3$	$0.950 \pm 0.005$	$32.9 \pm 0.4$	$30 \pm 3$	$15.1 \pm 0.3$	$0.645 \pm 0.005$	$23.4 \pm 0.3$	$7 \pm 1$
125	$31.4 \pm 0.3$	$0.950 \pm 0.005$	$32.4 \pm 0.4$	$23 \pm 2$	$14.8 \pm 0.3$	$0.650 \pm 0.005$	$22.7 \pm 0.3$	$5 \pm 1$
175	$31.4 \pm 0.3$	$0.975 \pm 0.005$	$32.2 \pm 0.4$	$17 \pm 2$	$14.6 \pm 0.3$	$0.650 \pm 0.005$	$22.4 \pm 0.3$	$3 \pm 0.7$
300	$30.1 \pm 0.3$	$0.945 \pm 0.005$	$31.9 \pm 0.4$	$10 \pm 1$	$14.2 \pm 0.3$	$0.645 \pm 0.005$	$22.0 \pm 0.3$	$2 \pm 0.5$

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