Two-dimensional(2D)layered materials,with large second-order nonlinear susceptibility,are currently growing as an ideal candidate for fulflling tunable nanoscale coherent light through the second-order nonlinear optic...Two-dimensional(2D)layered materials,with large second-order nonlinear susceptibility,are currently growing as an ideal candidate for fulflling tunable nanoscale coherent light through the second-order nonlinear optical parametric processes.However,the atomic thickness of 2D layered materials leads to poor feld confnement and weak light-matter interaction at nanoscale,resulting in low nonlinear conversion efciency.Here,hybrid three-dimensional(3D)spiral WSe2 plasmonic structures are fabricated for highly efcient second harmonic generation(SHG)and sum-frequency generation(SFG)based on the enhanced light-matter interaction in hybrid plasmonic structures.Te 3D spiral WSe2,with AA lattice stacking,exhibits efcient SH radiation due to the constructive interference of nonlinear polarization between the neighboring atomic layers.Tus,extremely high external SHG conversion efciency(about 2.437×10−5)is achieved.Moreover,the ease of phase-matching condition combined with the enhanced light-matter interaction in hybrid plasmonic structure brings about efcient SHG and SFG simultaneously.Tese results would provide enlightenment for the construction of typical structures for efcient nonlinear processes.展开更多
Laser displays,benefiting from the characteristic merits of lasers,have led to the revolution of next-generation display technologies owing to their superior color expression.However,the acquisition of pixelated laser...Laser displays,benefiting from the characteristic merits of lasers,have led to the revolution of next-generation display technologies owing to their superior color expression.However,the acquisition of pixelated laser arrays as self-emissive panels for flat-panel laser displays remains challenging.Liquid crystal(LC)materials with excellent processability and optoelectronic properties offer considerable potential for the construction of highly ordered multicolor laser arrays.Here,we demonstrate flat-panel laser displays on LC microlaser pixel arrays through a microtemplate-assisted inkjet printing method.Individual organic red-green-blue(RGB)microlaser pixel arrays were obtained by doping dyes into LCs with photonic band edges to obtain single-mode RGB lasing,leading to a much broader color gamut,compared with the standard RGB color space.Then we acquired periodically patterned RGB pixel matrices by positioning LC microlasers precisely into highly ordered arrays,according to the well-organized geometry of the microtemplates.Subsequently,we demonstrated full-color flat-panel laser displays using the LC microlaser pixel matrices as self-emissive panels.These results provide valuable enlightenment for the construction of next-generation flat-panel laser display devices.展开更多
The bulk,pristine sp^(2) carbons,such as graphite,carbon nanotubes,and graphene,are usually assumed to be typical diamagnetic materials.However,over the past two decades,there have been many reports about the ferromag...The bulk,pristine sp^(2) carbons,such as graphite,carbon nanotubes,and graphene,are usually assumed to be typical diamagnetic materials.However,over the past two decades,there have been many reports about the ferromagnetism in these sp^(2) carbon materials,which have attracted intense interest for basic research and potential applications.In this review,we focus on the evidence and developments of the emergent ferromagnetism in sp^(2) carbon revealed by nine kinds of experimental methods:magnetic force microscopy(MFM),magnetization measurements with physical property measurement system(PPMS),X-ray magnetic circular dichroism(XMCD),scanning tunneling microscopy(STM),miniaturized magnetic particle inspection(MPI),anomalous Hall effect(AHE),mechanical deflection of carbon nanotube cantilevers,magnetoresistance,and spin-related devices(spin field effect transistor and spin memory).The advantages,conclusions,challenges,and future of these methods are discussed.The ferromagnetism in sp^(2) carbon will open a door to explore exotic physical phenomena and lay the basis for the development of integrated circuit of spintronics,which is fundamentally different from charge-based conventional electronics.展开更多
基金Tis work was supported fnancially by the Ministry of Science and Technology of China[Grant Nos.2017YFA0204502 and 2015CB932404]the National Natural Science Foundation of China[Grant Nos.21773265,21533013,and 21790364]and the Youth Innovation Promotion Association CAS[2014028].
文摘Two-dimensional(2D)layered materials,with large second-order nonlinear susceptibility,are currently growing as an ideal candidate for fulflling tunable nanoscale coherent light through the second-order nonlinear optical parametric processes.However,the atomic thickness of 2D layered materials leads to poor feld confnement and weak light-matter interaction at nanoscale,resulting in low nonlinear conversion efciency.Here,hybrid three-dimensional(3D)spiral WSe2 plasmonic structures are fabricated for highly efcient second harmonic generation(SHG)and sum-frequency generation(SFG)based on the enhanced light-matter interaction in hybrid plasmonic structures.Te 3D spiral WSe2,with AA lattice stacking,exhibits efcient SH radiation due to the constructive interference of nonlinear polarization between the neighboring atomic layers.Tus,extremely high external SHG conversion efciency(about 2.437×10−5)is achieved.Moreover,the ease of phase-matching condition combined with the enhanced light-matter interaction in hybrid plasmonic structure brings about efcient SHG and SFG simultaneously.Tese results would provide enlightenment for the construction of typical structures for efcient nonlinear processes.
基金supported financially by the Ministry of Science and Technology of China(no.2017YFA0204502)the National Natural Science Foundation of China(grant nos.21533013 and 21790364).
文摘Laser displays,benefiting from the characteristic merits of lasers,have led to the revolution of next-generation display technologies owing to their superior color expression.However,the acquisition of pixelated laser arrays as self-emissive panels for flat-panel laser displays remains challenging.Liquid crystal(LC)materials with excellent processability and optoelectronic properties offer considerable potential for the construction of highly ordered multicolor laser arrays.Here,we demonstrate flat-panel laser displays on LC microlaser pixel arrays through a microtemplate-assisted inkjet printing method.Individual organic red-green-blue(RGB)microlaser pixel arrays were obtained by doping dyes into LCs with photonic band edges to obtain single-mode RGB lasing,leading to a much broader color gamut,compared with the standard RGB color space.Then we acquired periodically patterned RGB pixel matrices by positioning LC microlasers precisely into highly ordered arrays,according to the well-organized geometry of the microtemplates.Subsequently,we demonstrated full-color flat-panel laser displays using the LC microlaser pixel matrices as self-emissive panels.These results provide valuable enlightenment for the construction of next-generation flat-panel laser display devices.
基金supported by Major Nanoprojects of Ministry of Science and Technology of China(No.2018YFA0208403)the National Natural Science Foundation of China(No.21973021)+2 种基金The GBA National Institute for Nanotechnology Innovation,Guangdong,China(No.2020B0101020003)Chinese Academy of Sciences Project for Young Scientists in Basic Research(No.YSBR-030)Strategic Priority Research Program of Chinese Academy of Sciences(Nos.XDB36000000 and NBSDC-DB-18).
文摘The bulk,pristine sp^(2) carbons,such as graphite,carbon nanotubes,and graphene,are usually assumed to be typical diamagnetic materials.However,over the past two decades,there have been many reports about the ferromagnetism in these sp^(2) carbon materials,which have attracted intense interest for basic research and potential applications.In this review,we focus on the evidence and developments of the emergent ferromagnetism in sp^(2) carbon revealed by nine kinds of experimental methods:magnetic force microscopy(MFM),magnetization measurements with physical property measurement system(PPMS),X-ray magnetic circular dichroism(XMCD),scanning tunneling microscopy(STM),miniaturized magnetic particle inspection(MPI),anomalous Hall effect(AHE),mechanical deflection of carbon nanotube cantilevers,magnetoresistance,and spin-related devices(spin field effect transistor and spin memory).The advantages,conclusions,challenges,and future of these methods are discussed.The ferromagnetism in sp^(2) carbon will open a door to explore exotic physical phenomena and lay the basis for the development of integrated circuit of spintronics,which is fundamentally different from charge-based conventional electronics.
