Article
Chemistry, Multidisciplinary
Qing Chang, Jingrong Sui, Zhijun Chai, Wenzhi Wu
Summary: The study on the temperature dependence of excitonic photoluminescence and nonlinear absorption of CdTe nanocrystals/PVA film revealed a composition of trapped state and band-edge excitonic state in the excitonic PL, which changes with temperature. Additionally, the nonlinear absorption coefficient was found to decrease with the increase in the size of the NCs using the Z-scan method.
Article
Chemistry, Multidisciplinary
Ruixiang Wu, Xiaoshuai Wang, Jingjing Luo, Xin Liu, Fengjie Guo, Bin Li, Shengzhi Wang, Peigeng Han, Xiangyang Miao
Summary: This study investigates the photoinduced charge transfer between lead-free Mn-doped Cs2NaIn0.75Bi0.25Cl6 double perovskite nanocrystals and conjugated polymers. The reversible charge transfer is found to be tunable by varying the excitation photon-energy.
Article
Nanoscience & Nanotechnology
Bingyue Li, Hui Li, Yanhui Sun, Mark G. Humphrey, Chi Zhang, Zhipeng Huang
Summary: This study reports the nonlinear optical properties of lead-free Cs2AgBiBr6 perovskite. Pristine Cs2AgBiBr6 thin film exhibits strong reverse saturable absorption (RSA), while Cs2AgBiBr6 thin film with defects (denoted as Cs2AgBiBr6(D)) shows saturable absorption (SA). The nonlinear absorption coefficients for Cs2AgBiBr6 are ca. 4.0 x 104 cm GW-1 (515 nm laser excitation) and 2.6 x 104 cm GW-1 (800 nm laser excitation), while for Cs2AgBiBr6(D) they are -2.0 x 104 cm GW-1 (515 nm laser excitation) and -7.1 x 103 cm GW-1 (800 nm laser excitation). The optical limiting threshold of Cs2AgBiBr6 is 8.1 x 10-4 J cm-2 (515 nm laser excitation). The samples show excellent long-term performance stability in air. The RSA of pristine Cs2AgBiBr6 correlates with excited-state absorption (515 nm laser excitation) and excited-state absorption following two-photon absorption (800 nm laser excitation), while the defects in Cs2AgBiBr6(D) strengthen the ground-state depletion and Pauli blocking, resulting in SA.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Wang Yue, Hang Yang, Haoyu Cai, Yiming Xiong, Tao Zhou, Yongjun Liu, Juan Zhao, Fuzhi Huang, Yi-Bing Cheng, Jie Zhong
Summary: In this study, an intermediate-phase-transition-assisted one-step blade coating method is proposed for the fabrication of transparent formamidinium lead bromide (FAPbBr(3)) perovskite films. The intermediate complex optimizes the crystal growth path, resulting in large-area, homogeneous, and dense absorber films. The fabricated perovskite solar cells show high efficiency, stability, and adjustable transparency, making them promising for next-generation building-integrated photovoltaic applications.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Xiaoyu Li, Lihe Yan, Jinhai Si, Aizhao Pan, Yanmin Xu, Xun Hou
Summary: The nonlinear optical absorption effects of perovskite quantum dots were studied in nanosecond and femtosecond regimes. By tuning the absorption edge through adjusting halogen elements, the materials showed excellent saturable absorption effects, with ultra-low saturation intensity indicating important application potential in mode-locking and Q-switched lasers.
OPTICAL MATERIALS EXPRESS
(2021)
Article
Physics, Multidisciplinary
Xuanyu Zhang, Shuyu Xiao, Xiongbin Wang, Tingchao He, Rui Chen
Summary: In this study, the nonlinear optical behavior of FAPbBr(3) nanocrystals (NCs) was investigated. It was found that these NCs have high two-photon absorption cross-section and excellent stability. The temperature-dependent photoluminescence induced by two-photon absorption was observed, confirming the weak Pb-Br interaction and strong hydrogen bond interaction in FAPbBr(3) NCs. These findings are expected to promote the application of FAPbBr(3) NCs in optoelectronic devices.
Article
Chemistry, Physical
Saptarshi Mandal, Swarnali Ghosh, Soumen Mukherjee, Debjit Roy, Chayan K. De, Kingshuk Mukhuti, Prasun K. Mandal
Summary: The study demonstrates that CsPbBr3 perovskite nanocrystals exhibit high optical robustness and the ability to depict ensemble optical behavior, which are crucial for their prospective applications.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Soumen Mukherjee, Swarnali Ghosh, Dibyendu Biswas, Mainak Ghosal, Kheyali De, Prasun K. Mandal
Summary: Zn-alloyed CsPb(Cl/Br)(3) perovskite nanocrystals (PNCs) were synthesized and used as a model system for Mn doping to study the effect of Mn doping on exciton dynamics. The radiative decay rate of the host band decreased by about 6.5 times and the non-radiative decay rate increased by about 2.5 times upon Mn doping, while keeping the PL emission maximum and PLQY of both PNC samples nearly the same. Unlike previous reports, the integrated PL intensity of the dopant emission in this case increased by about 5.5-fold when the temperature decreased from 290 K to 190 K. The presence of shallow trap states was responsible for the truncation in the PDDs of both ON and OFF events for PNC1, whereas the deep dopant states did not allow truncation in the host PL emission of PNC2.
Article
Nanoscience & Nanotechnology
Ilka Vincon, Fedja J. Wendisch, Daniele De Gregorio, Stefanie D. Pritzl, Quinten A. Akkerman, Haoran Ren, Leonardo de S. Menezes, Stefan A. Maier, Jochen Feldmann
Summary: In this study, we developed a hybrid system consisting of a dielectric chiral nanoantenna array coated with perovskite nanocrystals. By tuning the thickness of the nanocrystal film and utilizing the properties of the chiral surface, we successfully enhanced the photoluminescence emission of the nanocrystals.
Article
Chemistry, Physical
Yawen Liu, Byeong Jo Kim, Hua Wu, Gerrit Boschloo, Erik M. J. Johansson
Summary: The research successfully constructed a 2D/3D perovskite interface using the PEABr treatment method, significantly enhancing the power conversion efficiency and fill factor of perovskite solar cells. The hydrophobic alkyl chain in the PEA cation not only improved the moisture tolerance of perovskite, but also increased the stability of the solar cells.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Jintong Lu, Shuangping Yi, Yixuan Zhou, Pengfei Xu, Zhengfa Hu, Weiren Zhao, Yinhai Wang
Summary: In this study, porous polymer (ethylene-vinyl acetate copolymer, EVA) and perovskite nanocrystals were mixed to form perovskite nanocrystals-EVA composites. After aging for 21 days in water, the fluorescence enhancement was 170 times, and even in a strongly acidic environment, the fluorescence enhancement was 91 times. The composite material can effectively encrypt information in a wet environment due to the change of light wavelength, making a white light-emitting diode (w-LED). This composite material unleashes new possibilities for solid-state lighting and flexible displays in humid and strongly acidic environments.
Article
Chemistry, Physical
Feng Zhang, Xin Zhang, Chenhui Wang, Mengna Sun, Xiyu Luo, Yingguo Yang, Shuai Chang, Dongdong Zhang, Lian Duan
Summary: Alloyed perovskite nanocrystal films with optimized Cl distribution, fabricated using Cl-ligands, demonstrate superior blue EL emission performance in devices and greatly enhanced spectral stability compared to conventional Br-ligands.
Article
Materials Science, Multidisciplinary
Yinsheng Xu, Xudong Zhao, Mengling Xia, Xianghua Zhang
Summary: Metal halide perovskite nanocrystals (PNC) show excellent luminescent efficiency and short emission lifetime, however, their poor stability restricts their applications. In this study, stable CsPbBr3 NCs were generated in an all-inorganic glass matrix, demonstrating good luminescent performance and high stability. The PNC glass-ceramic showed promising potential for X-ray detection scenarios due to its excellent performance, stability, and processable nature.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Materials Science, Multidisciplinary
Yuting Wang, Xiong Shen, Chenggang Yuan, Bingkun Chen, Lin Chen, Zhongming Wang, Fei Hu, Qiuyun Ouyang
Summary: Halide perovskite (Cs3Cu2Br5) is synthesized via thermal injection method. XRD confirms the crystal structure of Cs3Cu2Br5. Organic glasses are fabricated by dispersing Cs3Cu2Br5 in MMA. The Cs3Cu2Br5/PMMA organic glasses exhibit excellent nonlinear absorption and refraction properties. The perovskite material shows great potential in devices such as LEDs and optical switches.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Multidisciplinary Sciences
Maximilian Frenzel, Marie Cherasse, Joanna M. Urban, Feifan Wang, Bo Xiang, Leona Nest, Lucas Huber, Luca Perfetti, Martin Wolf, Tobias Kampfrath, X. -y. Zhu, Sebastian F. Maehrlein
Summary: We use intense THz electric fields to directly control the lattice of hybrid CH3NH3PbBr3 and all-inorganic CsPbBr3 perovskites by nonlinear excitation of octahedral twist modes. Raman-active phonons in the range of 0.9 to 1.3 THz are found to dominate the phonon-modulated polarizability, leading to the ultrafast THz-induced Kerr effect and potential implications for dynamic charge carrier screening beyond the Frohlich polaron. Our work opens up the possibility of selectively controlling the vibrational degrees of freedom in LHPs, which can influence phase transitions and dynamic disorder.
Article
Optics
Wenyou Gou, Jianghua Zhang, Zhuohang Zhang, Xiangai Cheng, Tian Jiang
Summary: This paper investigates a microwave photonics scanning channelizer with digital image-reject mixing and linearization, utilizing a cascaded distributed feedback semiconductor laser (DFB) operating at stable locking dynamics with flat optical frequency comb (OFC) injection. The proposed channelizer offers high-quality coherent optical local oscillator with ultra-broadband tuning capability by demultiplexing and amplifying individual comb from densely spaced OFC. It also employs digital Hartley structure image-reject mixing (IRM) and digital linearization technique to compensate for amplitude and phase imbalances, resulting in high image rejection ratio (IRR) and improved spurious free dynamic range (SFDR).
OPTICS COMMUNICATIONS
(2023)
Article
Optics
D. E. N. G. H. U. Song, K. E. Yin, R. U. N. L. I. N. Miao, C. H. E. N. X. Zhang, Z. H. O. N. G. J. I. E. Xu, T. I. A. N. Jiang
Summary: In this paper, the characteristics of dispersion-managed, polarization-maintaining (PM) 1-GHz mode-locked fiber lasers were investigated both experimentally and numerically. Three compact and robust 1-GHz fiber lasers operating at different dispersion regimes were demonstrated. The long-term stability of the lasers without external control was also proved. A numerical model was constructed to analyze the mode-locking dynamics, and pulse evolution simulations were carried out, showing agreement with experimental results.
Article
Optics
Jun Zhang, Qiuquan Yan, Hengzhu Liu, Yuhua Tang, Tong Zhou, Tian Jiang
Summary: Optical neural networks utilize optical neurons to achieve complex functions. The proposed deep reinforcement coherent optical neuron control (DRCON) method improves convergence rate and effective number of bits, showing promise for large-scale optical neural network control.
Article
Chemistry, Multidisciplinary
Yuze Hu, Mingyu Tong, Siyang Hu, Weibao He, Xiang'ai Cheng, Tian Jiang
Summary: By using theoretical analysis, numerical simulation, and experimental realization, an achromatic Fano metasurface with high contrast, broadband response, and ultrafast switching rate is successfully achieved. The physics of inter-mode coupling is developed to design the Fano metasurface based on a complete phase diagram. Unlike conventional Fano metasurfaces, the cross-polarized inter-metaatoms coupling is discovered as a superior ability for high-efficiency broadband achromatic polarization conversion.
Article
Engineering, Electrical & Electronic
Wenyou Gou, Jianghua Zhang, Zhuohang Zhang, Wei Dong, Xiangai Cheng, Tian Jiang
Summary: This article experimentally demonstrates a photonic microwave signals generation scheme for background-free phase-coded (PC) radar pulse with multioctave tuning. An optical frequency comb (OFC) demultiplexing technology based on optical injection locking (OIL) provides a power-equalized coherent optical local oscillator (LO) with ultra-broadband tuning capability. The scheme features a flat frequency response over an ultra-wideband frequency range without needing a broadband modulator and radio frequency (RF) synthesizer. A proof-of-concept experiment shows that the power fluctuation of 0.5 Gbps background-free PC pulses is lower than 3.12 dB within 3 similar to 24 GHz carrier frequency. The pulse compression performance and system stability are also investigated.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Suyiming Luo, Haolin Ding, Shihe Yi, Lin He, Tian Jiang
Summary: With the increase of flight speed, aero-optical effects induced by the turbulent boundary layer near the optical window become increasingly significant. The influence of the optical aperture size on the aero-optical effects of supersonic (Mach 3.0) turbulent boundary layer (SPTBL) was studied, and the underlying mechanisms were analyzed. The results showed that the optical aperture size affects the beam jitter, beam offset, and beam spread, which are caused by turbulent structures of different scales.
Article
Chemistry, Physical
Yan Kang, Yabo Chen, Yinlong Tan, Hao Hao, Cheng Li, Xiangnan Xie, Weihong Hua, Tian Jiang
Summary: Activation of artificial synapses through Sn intercalation in a-MoO3 allows for efficient response to light stimuli and persistent photoconductivity. The resulting Sn-MoO3 device exhibits high paired pulse facilitation and tunable synaptic plasticity, showing great potential for neuromorphic computing. The extensible artificial neural network (ANN) based on Sn-MoO3 synapses demonstrates superior performance in pattern recognition.
JOURNAL OF MATERIOMICS
(2023)
Article
Multidisciplinary Sciences
Ke Wei, Qirui Liu, Yuxiang Tang, Yingqian Ye, Zhongjie Xu, Tian Jiang
Summary: Controlling light-matter interaction at micro- and nano-scale is important for modern optics and optoelectronics. The study explores a new cooperative coupling between plasmon and different excitonic complexes in WS2-silver nanocavities, resulting in the creation of plasmon-excitontrion-charged biexciton four coupling states. The demonstration of the charged biexciton polariton showcases high nonlinearity and potential for energy-efficient optical switching and information processing.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Weibao He, Yuze Hu, Ziheng Ren, Siyang Hu, Zhongyi Yu, Shun Wan, Xiang'ai Cheng, Tian Jiang
Summary: The study demonstrates an active non-Hermitian metasurface with a loss-induced parity-time symmetry phase transition for ultrafast terahertz modulation. By manipulating the transient loss variation, ultrafast modulation of exceptional points can be achieved on a picosecond timescale. A switchable polarization manipulation device is designed based on the chiral transmission characteristics of exceptional points.
Article
Engineering, Electrical & Electronic
Wenyou Gou, Xin Zhang, Wei Dong, Zhuohang Zhang, Taolin Liu, Jianghua Zhang, Tian Jiang
Summary: In this article, a photonic multiformat microwave signal generator with immunity to chromatic dispersion-induced power fading is proposed and demonstrated. The system utilizes a dual-parallel Mach-Zehnder modulator driven by a baseband signal to perform multiformat modulation of the optical signal. An active demultiplexer based on optical injection locking is used to filter and amplify individual comb lines from the optical frequency comb, generating the microwave signal. The system features an ultra-wideband frequency tuning range and eliminates the need for a broadband modulator and RF synthesizer. The proof-of-concept experiment successfully generates multiformat waveforms and eliminates CDIP in long-range transmission.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Chemistry, Multidisciplinary
Bo Tian, Jingyao Jiang, Zebo Zheng, Ximiao Wang, Shaojing Liu, Wuchao Huang, Tian Jiang, Huanjun Chen, Shaozhi Deng
Summary: Optical skyrmions have been successfully demonstrated using different field vectors, but the study of their generation, control, and correlation with electromagnetic fields is still in its infancy. In this study, we propose that evanescent TM-polarized EM fields with rotational symmetry are actually Neel-type optical target skyrmions of electric field vectors. Our proposal was verified by numerical simulations and real-space nano-imaging experiments on a graphene monolayer, showing that the target skyrmions can be as small as & SIM;100 nm in diameter. These findings not only increase our understanding of the formation mechanisms of EM topological textures, but also provide guidelines for constructing EM skyrmions with potential impacts on future information technologies.
Article
Optics
Yihao Luo, Jun Zhang, Shiyin Du, Qiuquan Yan, Zeyu Zhao, Zilong Tao, Tong Zhou, Tian Jiang
Summary: This article introduces the importance of material design and fiber beams, as well as the application of deep learning algorithms in material design. Through deep learning algorithms, the performance and response of materials can be effectively simulated, achieving efficient material design.
CHINESE JOURNAL OF LASERS-ZHONGGUO JIGUANG
(2023)
Article
Optics
Liu Qirui, Tang Yuxiang, Wei Ke, Jiang Tian
Summary: This paper reviews the progress in the field of magneto-optical research on antiferromagnets. The interactions between laser and two-dimensional antiferromagnets are discussed, including the macroscopic magneto-optical effect and microscopic elementary excitation quasiparticle. The properties and characteristics of typical van der Waals antiferromagnets are introduced, and various magneto-optical effects and their applications in antiferromagnetic materials are discussed. The prospects for further research and the application of two-dimensional antiferromagnets in magneto-optical and related fields are summarized.
CHINESE JOURNAL OF LASERS-ZHONGGUO JIGUANG
(2023)
Article
Automation & Control Systems
Jun Zhang, Zilong Tao, Qiuquan Yan, Shiyin Du, Yuhua Tang, Hengzhu Liu, Ke Wei, Tong Zhou, Tian Jiang
Summary: This study aims to demonstrate that hardware can inspire algorithm design for photonic convolutional neural networks. The authors developed a dual optical frequency comb neuron (DOFCN) architecture to perform nonlinear activation and vector convolution without dispersion and large-scale modulator arrays. The proposed DOFCN-based composite vector convolutional neural networks (CVCNNs) showed improved classification accuracy and regression residuals compared to standard CNN.
ADVANCED INTELLIGENT SYSTEMS
(2023)
Article
Optics
Denghui Song, Ke Yin, Runlin Miao, Chenxi Zhang, Zhongjie Xu, Tian Jiang
Summary: This paper investigates the characteristics of dispersion-managed, polarization-maintaining 1-GHz mode-locked fiber lasers both experimentally and numerically. Three compact and robust 1-GHz fiber lasers operating at different dispersion regimes were demonstrated. The net dispersion of the cavity is adjusted by changing the types of PM erbium-doped fibers and SESAMs. The long-term stability of the lasers is proved without external control.