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학술지 Reversible supramolecular chiral structures induced in azopolymers by elliptically polarized light: influence of the irradiation wavelength and intensity
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저자
Blaga Blagoeva, Lian Nedelchev, Dimana Nazarova, Elena Stoykova, 박중기
발행일
202202
출처
Applied Optics, v.61 no.5, pp.147-155
ISSN
1559-128X
출판사
Optical Society of America (OSA)
DOI
https://dx.doi.org/10.1364/AO.444159
협약과제
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초록
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, P1, P1?닋2, which are amorphous, and P2, 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?뿦/쨉m) and P1?닋2 (25?뿦/쨉m). 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.
KSP 제안 키워드
All-optical switch, Elliptically polarized light, Holographic gratings, Irradiation wavelength, Real-Time, Structures formation, azo materials, chiral structures, linear birefringence, liquid crystalline, thin film(TF)