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| 1 | Ultrafast all-optical terahertz modulation based on an inverse-designed metasurface显示文摘Metasurface plays a key role in various terahertz metadevices,while the designed terahertz metasurface still lacks flexibility and variety.On the other hand,inverse design has drawn plenty of attention due to its flexibility and robustness in the application of photonics.This provides an excellent opportunity for metasurface design as well as the development of multifunctional,high-performance terahertz devices.In this work,we demonstrate that,for the first time,a terahertz metasurface supported by the electromagnetically induced transparency(EIT)effect can be constructed by inverse design,which combines the particle swarm optimization algorithm with the finite-difference time-domain method.Incorporating germanium(Ge)film with inverse-designed metasurface,an ultrafast EIT modulation on the picosecond scale has been experimentally verified.The experimental results suggest a feasibility to build the terahertz EIT effect in the metasurface through an optimization algorithm of inverse design.Furthermore,this method can be further utilized to design multifunctional and high-performance terahertz devices,which is hard to accomplish in a traditional metamaterial structure.In a word,our method not only provides a novel way to design an ultrafast all-optical terahertz modulator based on artificial metamaterials but also shows the potential applications of inverse design on the terahertz devices. | WEIBAO HE MINGYU TONG ZHONGJIE XU YUZE HU XIANG’AI CHENG TIAN JIANG | 2021 | Photonics Research2021，9，6： | 4 |
| 2 | Helicity‐dependent THz emission induced by ultrafast spin photocurrent in nodal‐line semimetal candidate Mg3Bi2显示文摘Helicity-dependent ultrafast spin current generated by circularly polarized photons in topological materials holds the crux to many technological improvements,such as quantum communications,on-chip communication processing and storage.Here,we present the manipulation of helicity-dependent terahertz emission generated in a nodal line semimetal candidate Mg3Bi2 by using photon polarization states.The terahertz emission is mainly ascribed to the helicity-dependent photocurrent that is originated from circular photogalvanic effects,and the helicity-independent photocurrent that is attributed to linear photogalvanic effect.Our work will inspire more explorations into novel nodal line semimetals and open up new opportunities for developing ultrafast optoelectronics in the topological system. | Mingyu Tong Yuze Hu Xiangnan Xie Xiegang Zhu Zhenyu Wang Xiang'ai Cheng Tian Jiang | 2020 | Opto-Electronic Advances2020，3，12： | 3 |
| 3 | Ultrasensitive polarization-dependent terahertz modulation in hybrid perovskites plasmoninduced transparency devices显示文摘Active control of metamaterial properties with high tunability of both resonant intensity and frequency is essential for advanced terahertz(THz) applications, ranging from spectroscopy and sensing to communications.Among varied metamaterials, plasmon-induced transparency(PIT) has enabled active control with giant sensitivity by embedding semiconducting materials. However, there is still a stringent challenge to achieve dynamic responses in both intensity and frequency modulation. Here, an anisotropic THz active metamaterial device with an ultrasensitive modulation feature is proposed and experimentally studied. A radiative-radiative-coupled PIT system is established, with a frequency shift of 0.26 THz in its sharp transparent windows by polarization rotation. Enabled by high charge-carrier mobility and longer diffusion lengths, we utilize a straightforwardly spincoated MAPbI3 film acting as a photoactive medium to endow the device with high sensitivity and ultrafast speed.When the device is pumped by an ultralow laser fluence, the PIT transmission windows at 0.86 and 1.12 THz demonstrate a significant reduction for two polarizations, respectively, with a full recovery time of 561 ps. In addition, we numerically prove the validity that the investigated resonator structure is sensitive to the optically induced conductivity. The hybrid system not only achieves resonant intensity and frequency modulations simultaneously, but also preserves the all-optical-induced switching merits with high sensitivity and speed, which enriches multifunctional subwavelength metamaterial devices at THz frequencies. | JUNHU ZHOU YUZE HU TIAN JIANG HAO OUYANG HAN LI YIZHEN SUI HAO HAO JIE YOU XIN ZHENG ZHONGJIE XU XIANG’AI CHENG | 2019 | Photonics Research2019，7，9： | 3 |
| 4 | Ultrafast polarization-dependent all-optical switching of germanium-based metaphotonic devices显示文摘Metamaterials play an important role in the modulation of amplitude and group delay in the terahertz(THz)regime on account of their optical properties,which are rare in natural materials.Here an ultrafast anisotropic switch of the plasmon-induced transparency(PIT)effect is experimentally and numerically demonstrated by metamaterial devices composed of two pairs of planar split-ring resonators and a pair of closed-ring resonators.By integration with a germanium(Ge)film,a recovery time of 3 ps and a decay constant of 785 fs are realized in the metadevice.Stimulated by the exterior optical pump,the PIT windows at different frequencies are switched off with an excellent property of slow light for vertical and horizontal THz polarizations,realizing an astonishing modulation depth as high as 99.06%.This work provides a new platform for ultrafast anisotropic metadevices tunable for amplitude and group delay. | HAO SUN YUZE HU YUHUA TANG JIE YOU JUNHU ZHOU HENGZHU LIU XIN ZHENG | 2020 | Photonics Research2020，8，3： | 3 |
| 5 | The clutch size,incubation behavior of Reeves’s Pheasant(Syrmaticus reevesii) and their responses to ambient temperature and precipitation显示文摘Weather conditions play a pivotal role in embryo development and parental incubation costs,potentially impacting the clutch size and incubation behavior of birds.Understanding these effects is crucial for bird conservation.Reeves’ s Pheasant(Syrmaticus reevesii) is a threatened species endemic to China,which is characterized by female-only incubation.However,there is a lack of information regarding the impact of weather conditions on clutch size and incubation behavior in this species.Using satellite tracking,we tracked 27 wild female Reeves’ s Pheasants from 2020 to 2023 in Hubei Province,China.We explored their clutch size and incubation behavior,as well as their responses to ambient temperature and precipitation.Clutch size averaged 7.75 ±1.36,had an association with average ambient temperature and average daily precipitation during the egglaying period,and was potentially linked to female breeding attempts.Throughout the incubation period,females took an average of 0.73 ±0.46 recesses every 24 h,with an average recess duration of 100.80 ±73.37 min and an average nest attendance of 92.98 ±5.27%.They showed a unimodal recess pattern in which nest departures peaked primarily between 13:00 and 16:00.Furthermore,females rarely left nests when daily precipitation was high.Recess duration and nest attendance were influenced by the interaction between daily mean ambient temperature and daily precipitation,as well as day of incubation.Additionally,there was a positive correlation between clutch size and recess duration.These results contribute valuable insights into the lifehistory features of this endangered species. | Ting Jin Shuai Lu Yunqi Wang Junqin Hua Zhengxiao Liu Qian Hu Yating Liu Yuze Zhao Jianqiang Li Jiliang Xu | 2024 | Avian Research2024，15，1： | 0 |
| 6 | The Role of Comprehensive Information Sharing in Credit Market: Theoretical Analysis and New Evidence from the European Union显示文摘 | Naihong Hu Wenchen Gu Yuze Zhou | 2017 | Journal of Modern Accounting and Auditing2017，13，2： | 0 |
| 7 | Interpreting the biochemical specificity of mouse spinal cord by confocal raman microspectral imaging显示文摘Interpreting the biochemical specifcity of spinal cord tissue is the essential requirement for underst.anding the biochemical mechanisms during spinal-cord-related pathological course.In this work,a longitudinal study was implemented to reveal a precise linkage betwoen the spectral features and the molecular composition in er vivo mouse spinal cord tissue by microspectral Raman imaging.It was testified that lipid-rich white matter could be distinguished from gray matter not only by the lipid Raman peaks at 1064,1300,1445 and 1660 cm^(-1),but also by protein(1250 and 1328 cm^(-1))and saccharides(913 and 1137 cm^(-1))distributions.K-means cluster analysis was further applied to visualize the morphological basis of spinal cord tissue by chemical components and their dist ribution patterns.T wo-dimensional chemical images were then generated to visualize the contrast between two different tissue types by integrating the intensitics of the featured Raman bands.All the obtained results ilustrated the biochemical characteristics of spinal cord tssue,as well as some specific substance variances bet ween different tssue types,which formed a solid basis for the molecular investigation of spinal cord pathologi cal alterations. | Yuze Gong Zhuowen Liang Yaning Yin Jiwei Song Xueyu Hu Kaige Wang Qingli He Zhe Wang Jintao Bai Shuang Wang | 2017 | Journal of Innovative Optical Health Sciences2017，，5： | 0 |
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