Four novel pyridimine compounds were prepared. The yield of the intermediates was improved with new method making use of Pd(Ⅱ) catalyst and cuprous acetylide which were proved to be practital in the formation of the ...Four novel pyridimine compounds were prepared. The yield of the intermediates was improved with new method making use of Pd(Ⅱ) catalyst and cuprous acetylide which were proved to be practital in the formation of the acetylide which were proved to be practical in the formation of the acetylides. Their nonlinear optical properties were briefly studied.展开更多
We theoretically investigate the evolvement of dark spatial soliton withcascading quadratic nonlinearity in quasi-phase-matched second harmonic generation. It is shown thatthe dark solitary wave can propagate stably w...We theoretically investigate the evolvement of dark spatial soliton withcascading quadratic nonlinearity in quasi-phase-matched second harmonic generation. It is shown thatthe dark solitary wave can propagate stably when background intensity is large enough, in whichdiffraction of beam can be balanced by the cascading quadratic nonlinearity. We also analyze theinfluence of phase-mismatch on the stabihty of dark soliton propagation.展开更多
Photonic structures with optical resonances beyond a single controllable mode are strongly desired for enhancing light±matter interactions and bringing about advanced photonic devices. However, the realization of...Photonic structures with optical resonances beyond a single controllable mode are strongly desired for enhancing light±matter interactions and bringing about advanced photonic devices. However, the realization of effective multimodal photonic structures has been restricted by the limited tunable range of mode manipulation, the spatial dispersions of electric fields or the polarization-dependent excitations. To overcome these limitations, we create a dualmode metasurface by integrating the plasmonic surface lattice resonance and the gap plasmonic modes;this metasurface offers a widely tunable spectral range, good overlap in the spatial distribution of electric fields, and polarization independence of excitation light. To show that such dual-mode metasurfaces are versatile platforms for enhancing light±matter interactions, we experimentally demonstrate a significant enhancement of second-harmonic generation using our design, with a conversion efficiency of 1±3 orders of magnitude larger than those previously obtained in plasmonic systems. These results may inspire new designs for functional multimodal photonic structures.展开更多
Herein,a novel photonic coordination polymer material was constructed by aggregation-induced emission luminogen(AIEgen)containing a tripyridyl moiety used as the linking ligand.It displayed a spontaneous direct centro...Herein,a novel photonic coordination polymer material was constructed by aggregation-induced emission luminogen(AIEgen)containing a tripyridyl moiety used as the linking ligand.It displayed a spontaneous direct centrosymmetric to noncentrosymmetric phase transition in a single crystal.The two crystals,before and after the phase transition,were both controllably synthesized and characterized by single-crystal X-ray diffraction.After being exposed to air,the centrosymmetric metastable phase(1-α)transitioned to a new stable phase with a noncentrosymmetric structure(1-β).Interestingly,the 1-βstructure exhibited a strong phasematching second-harmonic generation(SHG)response,about4.5 times higher than that of KH2PO4(KDP).In order to better understand the relationship between the structure and the nonlinear optical properties,the dipole moments were calculated and discussed.Remarkably,the noncentrosymmetric phase with high thermal stability for 1-βretained and improved the initial photoluminescent properties of the AIEgen ligand after the structural phase transition from 1-α,and simultaneously produced the excellent SHG property,which are beneficial for the design and construction of excellent optical materials.展开更多
A sodium zinc thiostannate Na2ZnSn2S6 is reported with its interesting structural features and property characteristics. It crystallizes in the polar space group Fdd2 （No. 43） with the unit cell parameters ofa=12.94...A sodium zinc thiostannate Na2ZnSn2S6 is reported with its interesting structural features and property characteristics. It crystallizes in the polar space group Fdd2 （No. 43） with the unit cell parameters ofa=12.945（3） A, b=23.556（5） A, c=7.2774（15）/k and Z=8. In its structure, Zn-centered penta-tetrahedra [ZnSn4S15]Z2- clusters arrange regularly along the diagonals of ab and ac planes to form a 3D tunnel structure with charge-balanced Na＋ cations located inside the tunnels. Note that SnS4 tetrahedra connect with each other by sharing comers to form infinite ∞[SnS3]n chains that are rarely found in known alkali-thiostannates. Remarkably, NazZnSnzS6 exhibits the good NLO performances, such as large SHG response （4 times that of AgGaS2 at 55-88 μm under the 2.09 μm radiation）, wide infrared （IR） transmission region （0.35-25 μm） and relatively high laser damage threshold （77.5 MW/cm2, -2 times that of AgGaS2）. Theoretical calculations have also been performed to investigate the structure-property relationship and the results indicate that the origin of NLO effect can be attributed to the penta-tetrahedra [ZnSn4S15]12- clusters.展开更多
文摘Four novel pyridimine compounds were prepared. The yield of the intermediates was improved with new method making use of Pd(Ⅱ) catalyst and cuprous acetylide which were proved to be practital in the formation of the acetylide which were proved to be practical in the formation of the acetylides. Their nonlinear optical properties were briefly studied.
文摘We theoretically investigate the evolvement of dark spatial soliton withcascading quadratic nonlinearity in quasi-phase-matched second harmonic generation. It is shown thatthe dark solitary wave can propagate stably when background intensity is large enough, in whichdiffraction of beam can be balanced by the cascading quadratic nonlinearity. We also analyze theinfluence of phase-mismatch on the stabihty of dark soliton propagation.
基金supported by the National Key R&D Program of China (2016YFA0301300)the National Natural Science Foundation of China (11974437 and 91750207)+6 种基金the Key-Area Research and Development Program of Guangdong Province (2018B030329001)Guangdong Special Support Program (2017TQ04C487)Guangdong Natural Science Funds for Distinguished Young Scholars (2017B030306007)Guangdong Natural Science Funds (2020A0505140004)Pearl River S&T Nova Program of Guangzhou (201806010033)the Open Fund of IPOC (BUPT) (IPOC2019A003)the Fundamental Research Funds for the Central Universities (20lgzd30)。
文摘Photonic structures with optical resonances beyond a single controllable mode are strongly desired for enhancing light±matter interactions and bringing about advanced photonic devices. However, the realization of effective multimodal photonic structures has been restricted by the limited tunable range of mode manipulation, the spatial dispersions of electric fields or the polarization-dependent excitations. To overcome these limitations, we create a dualmode metasurface by integrating the plasmonic surface lattice resonance and the gap plasmonic modes;this metasurface offers a widely tunable spectral range, good overlap in the spatial distribution of electric fields, and polarization independence of excitation light. To show that such dual-mode metasurfaces are versatile platforms for enhancing light±matter interactions, we experimentally demonstrate a significant enhancement of second-harmonic generation using our design, with a conversion efficiency of 1±3 orders of magnitude larger than those previously obtained in plasmonic systems. These results may inspire new designs for functional multimodal photonic structures.
基金supported by the Natural Science Foundation of Xinjiang Uygur Autonomous Region of China(2019D01C059)the National Natural Science Foundation of China(21671003 and 21201005)+4 种基金the High Performance Computing Center of Henan Normal University and the 111 Project(D17007)Xinjiang Program of Cultivation of Young Innovative Technical Talents(2018Q061)the“2018 Tianchi Doctoral Plan”of Xinjiang Uygur Autonomous Region of Chinathe Doctoral Scientific Research Foundation of Anhui Jianzhu University(2017QD15)Xinjiang University.We thank LetPub(www.letpub.com)for its linguistic assistance during the preparation of this manuscript。
文摘Herein,a novel photonic coordination polymer material was constructed by aggregation-induced emission luminogen(AIEgen)containing a tripyridyl moiety used as the linking ligand.It displayed a spontaneous direct centrosymmetric to noncentrosymmetric phase transition in a single crystal.The two crystals,before and after the phase transition,were both controllably synthesized and characterized by single-crystal X-ray diffraction.After being exposed to air,the centrosymmetric metastable phase(1-α)transitioned to a new stable phase with a noncentrosymmetric structure(1-β).Interestingly,the 1-βstructure exhibited a strong phasematching second-harmonic generation(SHG)response,about4.5 times higher than that of KH2PO4(KDP).In order to better understand the relationship between the structure and the nonlinear optical properties,the dipole moments were calculated and discussed.Remarkably,the noncentrosymmetric phase with high thermal stability for 1-βretained and improved the initial photoluminescent properties of the AIEgen ligand after the structural phase transition from 1-α,and simultaneously produced the excellent SHG property,which are beneficial for the design and construction of excellent optical materials.
基金supported by the Western Light Foundation of Chinese Acad-emy of Scienees(Grant No.XBBS201318)the National Natural Science Foundation of China(Grant Nos.51402352,51425206&91622107)+3 种基金the National Key Research Project(Grant Nos.2016YFB1102302 & 2016YFB0402104)Xinjiang Key Resealvh and Development Program(Grant No.2016B02021)Major Program of Xinjiang Uygur Autonomous Region of China during the 13th Five-Year Plan Period(Grant No.2016A02003)Fund of Key Laboratory of Opmelectronic Materials Chemistry and Physics,Chinese Academy of Sciences(Grant No.2008DP173016).
文摘A sodium zinc thiostannate Na2ZnSn2S6 is reported with its interesting structural features and property characteristics. It crystallizes in the polar space group Fdd2 （No. 43） with the unit cell parameters ofa=12.945（3） A, b=23.556（5） A, c=7.2774（15）/k and Z=8. In its structure, Zn-centered penta-tetrahedra [ZnSn4S15]Z2- clusters arrange regularly along the diagonals of ab and ac planes to form a 3D tunnel structure with charge-balanced Na＋ cations located inside the tunnels. Note that SnS4 tetrahedra connect with each other by sharing comers to form infinite ∞[SnS3]n chains that are rarely found in known alkali-thiostannates. Remarkably, NazZnSnzS6 exhibits the good NLO performances, such as large SHG response （4 times that of AgGaS2 at 55-88 μm under the 2.09 μm radiation）, wide infrared （IR） transmission region （0.35-25 μm） and relatively high laser damage threshold （77.5 MW/cm2, -2 times that of AgGaS2）. Theoretical calculations have also been performed to investigate the structure-property relationship and the results indicate that the origin of NLO effect can be attributed to the penta-tetrahedra [ZnSn4S15]12- clusters.
