In this work, 4-methoxylcinnamoyl chloride was reacted with a commercial hyperbranched polymer （Boltom-TM H30） to prepare a hyperbranched photosensitive polymer （H30-Ci）. The polymer was characterized by UV absorp...In this work, 4-methoxylcinnamoyl chloride was reacted with a commercial hyperbranched polymer （Boltom-TM H30） to prepare a hyperbranched photosensitive polymer （H30-Ci）. The polymer was characterized by UV absorption spectrum and 1H- NMR spectrum. After processed by Linearly Polarized Polymerization （LPP） method, the spin-coated films of H30-Ci were used as photo-alignment layers to assemble liquid crystal （LC） cells containing nematic liquid crystal （5CB）. The observation by polarized microscope showed that the H30-Ci blended with a linear polymer （BP-AN-Ci） photo-alignment layers could align LC molecules in a very uniform way.展开更多
Circularly polarized luminescent materials find extensive applications in 3D displays,information encryption,and photoinduced supramolecular chirality.However,controlling the handedness of circularly polarized lumines...Circularly polarized luminescent materials find extensive applications in 3D displays,information encryption,and photoinduced supramolecular chirality.However,controlling the handedness of circularly polarized luminescence remains a significant challenge in advancing optical technologies.In this study,we present a Janus circularly polarized light emitter comprising a fluorescent film combined with chiral nematic cellulose with switchable chirality.The emitter achieves maximum luminescence dissymmetry factors(0.28 and-0.65)through mode switching.In addition,we show the emitter’s versatility in inducing chiral helices in azobenzene polymers with varying polar groups,resulting in significant chiral signals.Importantly,the chirality of these polymers can be switched by altering the luminescence mode of the emitter.These results are expected to facilitate the efficient design of chiral luminescent materials and photoinduction devices.展开更多
Diffractive optical elements attract a considerable amount of attention, mainly due to their potential applications in imaging coding, optical sensing, etc. Application of ferroelectric liquid crystals(FLCs) with phot...Diffractive optical elements attract a considerable amount of attention, mainly due to their potential applications in imaging coding, optical sensing, etc. Application of ferroelectric liquid crystals(FLCs) with photoalignment technology in diffractive optical elements results in a high efficiency and a fast response time. In this study we demonstrate a circular Dammann grating(CDG) with a diffraction efficiency of 84.5%. The achieved response time of 64 μs is approximately two orders of magnitude faster than the existing response time of nematic liquid crystal devices. By applying a low electric field(V = 6 V) to the FLC CDG, it is switched between the eight-order diffractive state and the transmissive diffraction-free state.展开更多
基金the National Natural Science Foundation of China (No. 50103005)Thanks for Professor Shi Wenfang of University of Science and Technology of China to supply the hyperbranched polymer(H30).
文摘In this work, 4-methoxylcinnamoyl chloride was reacted with a commercial hyperbranched polymer （Boltom-TM H30） to prepare a hyperbranched photosensitive polymer （H30-Ci）. The polymer was characterized by UV absorption spectrum and 1H- NMR spectrum. After processed by Linearly Polarized Polymerization （LPP） method, the spin-coated films of H30-Ci were used as photo-alignment layers to assemble liquid crystal （LC） cells containing nematic liquid crystal （5CB）. The observation by polarized microscope showed that the H30-Ci blended with a linear polymer （BP-AN-Ci） photo-alignment layers could align LC molecules in a very uniform way.
基金supported by the National Key R&D Program of China(2023YFD2201405)the National Natural Science Foundation of China(32471804,32401514)+2 种基金the Canada Excellence Research Chair Program(CERC-2018-00006)the Canada Foundation for Innovation(38623)the Pacific Economic Development Canada(PacifiCAN).
文摘Circularly polarized luminescent materials find extensive applications in 3D displays,information encryption,and photoinduced supramolecular chirality.However,controlling the handedness of circularly polarized luminescence remains a significant challenge in advancing optical technologies.In this study,we present a Janus circularly polarized light emitter comprising a fluorescent film combined with chiral nematic cellulose with switchable chirality.The emitter achieves maximum luminescence dissymmetry factors(0.28 and-0.65)through mode switching.In addition,we show the emitter’s versatility in inducing chiral helices in azobenzene polymers with varying polar groups,resulting in significant chiral signals.Importantly,the chirality of these polymers can be switched by altering the luminescence mode of the emitter.These results are expected to facilitate the efficient design of chiral luminescent materials and photoinduction devices.
基金supported by the National Natural Science Foundation of China (Nos. 61405009,61875004,61705067)the Defense Industrial Technology Development Program (No. JCKY2019601C101)+1 种基金the Shanghai Pujiang Program (16PJ1402200)supported by the Russian Science Foundation (No. 20-19-00201)。
文摘Diffractive optical elements attract a considerable amount of attention, mainly due to their potential applications in imaging coding, optical sensing, etc. Application of ferroelectric liquid crystals(FLCs) with photoalignment technology in diffractive optical elements results in a high efficiency and a fast response time. In this study we demonstrate a circular Dammann grating(CDG) with a diffraction efficiency of 84.5%. The achieved response time of 64 μs is approximately two orders of magnitude faster than the existing response time of nematic liquid crystal devices. By applying a low electric field(V = 6 V) to the FLC CDG, it is switched between the eight-order diffractive state and the transmissive diffraction-free state.
