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Ferroelectric perovskite-type films with robust in-plane polarization toward efficient room-temperature chemiresistive sensing

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Fundamental Research 2023年第3期3卷 362-368页

作者： Shiguo Han Guan-E Wang Gang Xu Junhua Luo Zhihua Sun State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesNo.155 Yangqiao West RoadFuzhou 350002China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China No.155 Yangqiao West RoadFuzhou 350002China University of Chinese Academy of Sciences Chinese Academy of SciencesNo.19A Yuquan RoadBeijing 100039China

Ferroelectric materials have become key components for versatile device applications,and their thin films are highly desirable for integrating the miniaturized *** substantial endeavors,it is still challenging to achieve effective chemiresistive sensing in the ferroelectric ***,for the first time,we have exploited ferroelectric thin films of 2D hybrid perovskite BA_(2)EA_(2)Pb_(3)I_(10)(1),to fabricate the high-performance chemiresistor gas *** spin-coated films of 1 exhibit high orientation and good crystallinity,thus preserving robust in-plane spontaneous polarization(P_(s)~2.0μC/cm^(2))and low electric ***,such ferroelectric filmbased sensors after electric poling enable the dramatic room-temperature sensing responses to NO_(2) gas,including high sensitivity(0.05 ppm^(-1)),extremely low detection limit(1 ppm)and fast responding rate(~6 s).Besides,the chemiresistive responses are remarkably enhanced by threefold(up to 320%)through electric *** is proposed that this behavior closely involves with strong in-plane ferroelectric polarization of 1 that generates a built-in electric field inhibiting the recombination of charge *** far as we know,this ferroelectric-based film chemiresisor is one of the best room-temperature sensors for NO_(2) gas among all the existing candidate *** findings highlight great potential of ferroelectrics toward effective chemiresistive performances,and also establish a bright direction to explore their future device applications.

关键词： Ferroelectric-based films Hybrid perovskite 2D quantum-well in-plane polarization Chemiresistive sensing

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Source-configured symmetry-broken hyperbolic polaritons

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eLight 2023年第1期3卷 136-146页

作者： Caixing Hu Tian Sun Ying Zeng Weiliang Ma Zhigao Dai Xiaosheng Yang Xinliang Zhang Peining Li Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Optics Valley Laboratory Hubei 430074China Faculty of Materials Science and Chemistry Engineering Research Center of NanoGeomaterials of Ministry of EducationChina University of GeosciencesWuhan 430074China Xidian University Xi’an 710126China

Polaritons are quasi-particles that combine light with matter,enabling precise control of light at deep subwavelength *** excitation and propagation of polaritons are closely linked to the structural symmetries of the host materials,resulting in symmetrical polariton propagation in high-symmetry ***,in low-symmetry crystals,symmetry-broken polaritons exist,exhibiting enhanced directionality of polariton propagation for nanoscale light manipulation and ***,we theoretically propose and experimentally demonstrate the existence of symmetry-broken polaritons,with hyperbolic dispersion,in a high-symmetry *** show that an optical disk-antenna positioned on the crystal surface can act as an in-plane polarized excitation source,enabling dynamic tailoring of the asymmetry of hyperbolic polariton propagation in the high-symmetry crystal over a broad frequency ***,we provide an intuitive analysis model that predicts the condition under which the asymmetric polaritonic behavior is maximized,which is corroborated by our simulations and *** results demonstrate that the directionality of polariton propagation can be conveniently configured,independent of the structure symmetry of crystals,providing a tuning knob for the polaritonic response and in-plane anisotropy in nanophotonic applications.

关键词： Hyperbolic polaritons Near-field excitation Crystal symmetry in-plane polarization Calcite

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