Article
Optics
Bo LI, Wangqi Mao, Shuang Liang, Yifeng Shi, Hongxing Dong, Long Zhang
Summary: Blue-emitting perovskite microlasers with high-quality factor and tunable wavelength have been prepared in this study. The results of this study are of great significance for the application of blue laser fields.
PHOTONICS RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Kaichuan Wen, Yu Cao, Lianghui Gu, Saixue Wang, Dongmin Qian, Jingmin Wang, Zhiyuan Kuang, Mengyi Luo, Gang Wang, Shuzhen Guan, Mengmeng Li, Heng Yang, Guichuan Xing, Nana Wang, Lin Zhu, Qiming Peng, Wei Huang, Jianpu Wang
Summary: Continuous-wave lasing is achieved in an efficient perovskite LED with an integrated distributed feedback resonator, showing a low threshold at low temperature. The LED functions well even at high current density, suggesting the potential realization of electrically pumped perovskite laser diodes.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Sui Yang, Wei Bao, Xiaoze Liu, Jeongmin Kim, Rongkuo Zhao, Renmin Ma, Yuan Wang, Xiang Zhang
Summary: Halide perovskites possess remarkable photophysical properties that have led to high-performance lasers, but challenges in emission dynamics and laser size reduction remain. Plasmonic cavities have been used to address these challenges, but limitations still exist due to the trade-off between cavity size reduction and increased losses. The hybrid surface plasmon polaritons (SPPs) coupled with perovskites have shown to significantly reduce loss channels and enhance emission dynamics, paving the way for on-chip ultrafast optoelectronics.
Article
Chemistry, Multidisciplinary
Haiyun Dong, Christian Niclaas Saggau, Minshen Zhu, Jie Liang, Shengkai Duan, Xiaoyu Wang, Hongmei Tang, Yin Yin, Xiaoxia Wang, Jiawei Wang, Chunhuan Zhang, Yong Sheng Zhao, Libo Ma, Oliver G. Schmidt
Summary: The development of a micro-origami technique enables the design of 3D perovskite microarchitectures for a new type of microcavity laser, which exhibits outstanding laser performance and new functionalities such as 3D confined mode lasing and directional emission. This represents a significant advancement towards programmable microarchitectures in perovskite optoelectronics and photonics in the 3D era.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Lin Nie, Xue Yu, Yicen Ge, Dongxu He, Xuanyu Zhu, Haozhe Liu, Haihong Guo, Feng Zhao, Siufung Yu, Jianbei Qiu, Xuhui Xu, Ting Wang
Summary: This study successfully fabricated CsPbBr3 micro-lasers with low threshold and long-term stability by encapsulating the microcrystals with PVDF, providing an effective method for preparing perovskite microlasers with long-term stability.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Review
Chemistry, Multidisciplinary
Jiyoung Moon, Yash Mehta, Kenan Gundogdu, Franky So, Qing Gu
Summary: Hybrid metal-halide perovskites (MHPs) have great potential as gain media for on-chip lasers, but the stability and patterning methods of MHP lasers still need improvement. This review aims to provide strategies for improving the properties of MHPs and establishing optimal cavity patterning methods, as well as understanding the emission mechanisms in MHP materials and cavities.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Joao M. Pina, Darshan H. Parmar, Golam Bappi, Chun Zhou, Hitarth Choubisa, Maral Vafaie, Amin M. Najarian, Koen Bertens, Laxmi Kishore Sagar, Yitong Dong, Yuan Gao, Sjoerd Hoogland, Makhsud Saidaminov, Edward H. Sargent
Summary: A method utilizing a vapor-assisted chlorination strategy to synthesize low-dimensional CsPbCl3 thin films exhibiting deep-blue emission is reported, achieving high-quality perovskite thin films with low surface roughness and efficient charge transfer properties. This enables the fabrication of vertical-cavity surface-emitting lasers with low lasing thresholds and showcases the prospect of increasing the range of deep-blue laser sources.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Duc Huy Nguyen, Jia-Yuan Sun, Chia-Yao Lo, Jia-Ming Liu, Wan-Shao Tsai, Ming-Hung Li, Sin-Jhang Yang, Cheng-Chia Lin, Shien-Der Tzeng, Yuan-Ron Ma, Ming-Yi Lin, Chien-Chih Lai
Summary: This study demonstrates a successful method for achieving ultra-low-threshold continuous-wave room-temperature laser operation by using crystal fibers with robust and high-heat-load nature.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Lianghui Gu, Mengmeng Li, Jingya Lai, Dongmin Qian, Kaichuan Wen, Lei Xu, Gang Wang, Shuzhen Guan, Yuyang Zhang, Xinyu Huang, Jingjing Zhao, Guichuan Xing, Nana Wang, Lin Zhu, Qiming Peng, Wei Huang, Jianpu Wang
Summary: By regulating the crystallization of a NIR quasi-2D perovskite using an 18-crown-6 additive, a compact and smooth film with greatly improved carrier cascade efficiency was obtained. By combining the film with a high-quality distributed feedback grating, a CW NIR laser of 809 nm at 110 K was successfully realized, with a high Q-factor of 4794 and a low threshold of 911.6 W cm(-2). These findings provide an important foundation for achieving electrically pumped laser diodes based on the unique quasi-2D perovskites.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Victor Kopp, Jongchul Park, Jonathan Singer, Daniel Neugroschl, Azriel Z. Genack
Summary: By passively combining sixty-one lasing fiber channels in a monolithic optical resonator array, researchers achieved an output power above 200W at a two-micrometer wavelength. The study found that the central intensity enhancement improves as the number of channels increases, which is an important step towards a passively combined multichannel all-solid-state laser system.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Shuki Enomoto, Tomoya Tagami, Yusuke Ueda, Yuta Moriyama, Kentaro Fujiwara, Shun Takahashi, Kenichi Yamashita
Summary: Lead-halide perovskites are highly promising for optoelectronic applications, especially in laser devices. In this study, the photoluminescence properties of inorganic perovskite microcavities at room temperature are systematically investigated. The angle-resolved photoluminescence demonstrates a transition from weak coupling regime to strong coupling regime in the microcavity system, accompanied by an increase in correlated electron-hole pairs. Above a certain pumping fluence, the photoluminescence signal shows lasing behavior with bosonic condensation characteristics and long-range phase coherence. However, the excitation density required for lasing behavior exceeds the Mott density, suggesting that the excited state is not an exciton but a polaritonic Bardeen-Cooper-Schrieffer state.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Sangyeon Cho, Seok Hyun Yun
Summary: This study introduces a novel method of synthesizing LHP microlasers and applying functional coatings for applications in water-rich environments. The research demonstrates that organic pNE layers play a key role in enhancing the material lifetime of CsPbBr3 and enable bright luminescence and lasing in water.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Optics
Guoen Weng, Jiyu Yan, Shengjie Chen, Chunhu Zhao, Hanbing Zhang, Jiao Tian, Yuejun Liu, Xiaobo Hu, Jiahua Tao, Shaoqiang Chen, Ziqiang Zhu, Hidefumi Akiyama, Junhao Chu
Summary: This study successfully achieved single-mode laser operation in CsPbX3 microcavities at room temperature, with pumping wavelength range from 400 to 2300 nm, allowing for continuous tuning of laser wavelength.
PHOTONICS RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Jing Lu, Tinghuan Yang, Tianqi Niu, Nuo Bu, Yalan Zhang, Shiqiang Wang, Junjie Fang, Xiaoming Chang, Tao Luo, Jialun Wen, Yingguo Yang, Zicheng Ding, Kui Zhao, Shengzhong (Frank) Liu
Summary: This study comprehensively investigates the growth, structure, and optoelectronic properties of FA-based layered perovskites, revealing the influence of FA:PMA ratios and n values on the structure and performance of layered perovskites.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Review
Materials Science, Multidisciplinary
Juan F. Galisteo-Lopez, Mauricio E. Calvo, Hernan Miguez
Summary: Photoexcitation of lead halide perovskites induces restructuring that enhances emission properties but also triggers degradation, with strong dependence on the surrounding environment and interface design. The interaction with surroundings impacts the perovskite structure and optoelectronic performance, highlighting the need to consider these effects when characterizing them.
ADVANCED OPTICAL MATERIALS
(2021)
News Item
Optics
Artur Movsesyan, Zhiming Wang
Summary: The near-field chirality of a single-symmetry achiral object allows for polarization-dependent unidirectional photocurrent generation, and the vectorial output provides a new approach for a new family of geometric photodetectors.
Article
Materials Science, Multidisciplinary
Xingchao Zhang, Yunkun Yang, Hongxi Zhou, Xianchao Liu, Rui Pan, He Yu, Jun Gou, Zhiming Wu, Jiang Wu, Faxian Xiu, Yi Shi, Jun Wang
Summary: This study developed an ultra-low-noise-level PD linear array based on a 3D Dirac semimetal (Cd1-xZnx)(3)As-2/Sb2Se3 heterojunction. The PD exhibited outstanding photodetection capacity from the visible to mid-infrared region, with high SNR, peak specific detectivity, and response speed. It also demonstrated long-term stability and uniformity, showing great potential for advanced optoelectronic applications.
SCIENCE CHINA-MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Olivier Henrotte, Eva Yazmin Santiago, Artur Movsesyan, Luca Mascaretti, Morteza Afshar, Alessandro Minguzzi, Alberto Vertova, Zhiming M. Wang, Radek Zboril, Stepan Kment, Alexander O. Govorov, Alberto Naldoni
Summary: The investigation of photocatalytic systems at the nanoscale is crucial for understanding their fundamental principles, improving their design, and enhancing their applicability. A photochemical nanoscopy technique has been developed to detect the molecular products of plasmonic hot-carrier-driven photocatalytic reactions with nanometric precision. Applying this methodology to Au/TiO2 plasmonic photocatalysts, it was discovered that smaller and denser Au nanoparticle arrays have lower optical contribution but higher quantum efficiency in hot-hole-driven photocatalysis, which is closely related to population heterogeneity. This study also revealed the areas of oxidation and reduction product evolution in a single plasmonic nanodiode, demonstrating the bipolar behavior of such nanosystems. These findings enable quantitative investigations at the nanoscale to evaluate the photocatalytic reactivity of low-dimensional materials in various chemical reactions.
Article
Optics
Zhao Fei Yun, L. Yan, Tang Zhi Ting, Ren Ao Bo, Wu Jiang
Summary: This study reports high-power multi-junction vertical-cavity surface-emitting lasers (VCSELs) that effectively suppress carrier leakage under high injection current and temperature. By optimizing the energy band structure of quaternary AlGaAsSb, a 12-nm-thick AlGaAsSb electron-blocking layer (EBL) was achieved with improved performance. The proposed EBL demonstrated enhanced output power and power conversion efficiency during room-temperature operation, while also exhibiting advantages over the original device during high-temperature operation.
Article
Multidisciplinary Sciences
Wenhao Wang, Yogesh Kumar Srivastava, Thomas CaiWei Tan, Zhiming Wang, Ranjan Singh
Summary: Non-radiative bound states in the continuum (BICs) can create resonant cavities with confined electromagnetic energy and high-quality (Q) factors. By folding all guided modes into the light cone through periodic perturbation, BZF-BICs with ultrahigh Q factors can be achieved in a large, tunable momentum space. Unlike conventional BICs, BZF-BICs show perturbation-dependent dramatic enhancement of the Q factor throughout the momentum space and are robust against structural disorders.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Artur Movsesyan, Alina Muravitskaya, Lucas V. Besteiro, Eva Yazmin Santiago, Oscar Avalos-Ovando, Miguel A. Correa-Duarte, Zhiming Wang, Gil Markovich, Alexander O. Govorov
Summary: This study demonstrates the possibility of inducing chiral shapes in nanocrystals in a diluted solution using circularly polarized light (CPL). The chiral patterns are created by the electromagnetic retardation effect, with the formation of chiral hot-spot patterns on anisotropic nanocrystals with sharp edges and tips. 2D chirality is more easily induced than 3D chirality, and imprinting 3D chirality on spherical nanocrystals is not possible. Linearly polarized light (LPL) can create chiral nanocrystals on a substrate. This study provides the principles for using CPL and LPL illuminations to create chiral nanostructures.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Giuseppe Emanuele Lio, Antonio Ferraro, Rafal Kowerdziej, Alexander O. Govorov, Zhiming Wang, Roberto Caputo
Summary: The researchers report the design of a metamaterial-based sensor capable of detecting small amounts of molecules in a medium. By accurately selecting the parameters of the metamaterial, a highly sensitive sensor was developed. This work paves the way for the development of novel devices for biomedical and environmental applications.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Jiachen Sun, Nestor Guijarro, Peihang Li, Udayabhaskararao Thumu, Jun-Ho Yum, Kevin Sivula, Zhiming M. M. Wang
Summary: Photoelectrochemical water splitting and CO2 reduction reaction is a promising method for addressing energy and environment issues. Research has shown that a modified solution process can enhance crystal size and improve performance and output current by reducing surface ligands. Deposition of gold nanoparticles on CIGS surface can achieve a Faradic efficiency of 12.93% in aqueous electrolytes and 25% in nonaqueous electrolytes for CO2-to-CO conversion. Further investigation reveals that the CIGS photocathode displays stable photocurrent density within a certain applied potential range, but significant current degradation occurs at higher applied bias. Coupling catalysts with CIGS enhances selectivity towards CO and reduces competitive hydrogen evolution reaction.
ACS APPLIED NANO MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Yan Li, Feiyun Zhao, Zhiting Tang, Chuanlin Li, Jilin Liu, Aobo Ren, Hao-Chung Kuo, Jiang Wu
Summary: In this work, we propose a high-performance 760 nm vertical-cavity surface emitting laser (VCSEL) for oxygen sensing. By employing strained quantum wells and a tunnel-junction-connected structure, we demonstrate a high-power VCSEL that outperforms the conventional single mode VCSEL. The optimized device shows significantly improved power output, conversion efficiency, and slope efficiency. Furthermore, the proposed device exhibits suppressed localized temperature rise and high thermal stability, making it a valuable reference for the realization of high-power VCSELs.
IEEE JOURNAL OF QUANTUM ELECTRONICS
(2023)
Article
Physics, Applied
Yuqi Jin, Teng Yang, Menglin Yao, Zhiming Wang, Narendra B. Dahotre, Arup Neogi
Summary: A non-contacting ultrasound-based porosity fraction mapping methodology is developed for estimated small voids in coal using the effective medium approximation. This novel ultrasonic technique based on the mechanical properties of coal offers a rapid scan of the effective density mapping and distribution of void fraction over a large sample area, overcoming the limitation of small voids detection in the conventional ultrasound testing.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Caihong Teng, Xingyu Tang, Yixuan Huang, Wen Du, Weijie He, Aobo Ren, Jiang Wu, Zhiming Wang
Summary: This paper proposes an all-optical nonlinear activator based on the fiber-optic ring resonator (FORR) to achieve physically nonlinear activation at low light signal intensity. The device demonstrates excellent nonlinear traits, high stability, versatility, and compatibility with existing optical chips, making it a potential avenue for the scalability of optical neural networks.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Chemistry, Physical
Yisen Yao, Qiaoqiao Li, Yi-min Ding, Luo Yan, Weiwu Chen, Alexander Govorov, Zhiming Wang, Liujiang Zhou
Summary: The electronic structures and optical properties of lead-free perovskite materials Ln(2)Ti(2)O(5)S(2) were studied, revealing tunable band gap, small exciton binding energy, and potential applications in solar cells and water splitting. The materials also exhibit interesting carrier behaviors and effective masses.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Hong Zhong, Fengjiao Pan, Shuai Yue, Chengzhen Qin, Viktor Hadjiev, Fei Tian, Xinfeng Liu, Feng Lin, Zhiming Wang, Jiming Bao
Summary: This paper discusses the application of the Tauc plot in determining the bandgap of semiconductors and identifies baseline absorption as the cause of discrepancies between two different extrapolations. By simulating Tauc plots with varying levels of baseline absorption, the study demonstrates that both extrapolation methods can lead to significant errors. A new method is proposed and experimentally verified to idealize the absorption spectrum by removing its baseline before constructing the Tauc plot. This new method is applied to cubic boron arsenide (c-BAs), resolves its bandgap discrepancies, and obtains a converging bandgap of 1.835 eV based on both previous and new transmission spectra. The method is applicable to both indirect and direct bandgap semiconductors with absorption spectrum measured via transmission or diffuse reflectance, and is essential for obtaining accurate values of their bandgaps.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Optics
Aobo Ren, Hao Wang, Linjie Dai, Junfei Xia, Xinyu Bai, Edward Butler-Caddle, Joel A. Smith, Huagui Lai, Junzhi Ye, Xiang Li, Shijie Zhan, Chunhui Yao, Zewei Li, Mingchu Tang, Xueping Liu, Jinxin Bi, Bowei Li, Shen Kai, Rui Chen, Han Yan, Jintao Hong, Liming Yuan, Igor P. Marko, Adrian Wonfor, Fan Fu, Steven A. Hindmarsh, Ana M. Sanchez, James Lloyd-Hughes, Stephen J. Sweeney, Akshay Rao, Neil C. Greenham, Jiang Wu, Yanrong Li, Qixiang Cheng, Richard H. Friend, Richard V. Penty, Ian H. White, Henry J. Snaith, Wei Zhang
Summary: Tailoring the composition of organic cations allows for control over the recombination rates of perovskites. Solution-processed perovskite emitters fabricated on silicon substrates demonstrate modulation bandwidths up to 42.6 MHz and data rates of 50 Mbps.
Article
Physics, Applied
Oscar Avalos-Ovando, Veronica Bahamondes A. Lorca, Lucas V. Besteiro, Artur Movsesyan, Zhiming Wang, Gil Markovich, Alexander O. Govorov
Summary: Chirality, whether in light or matter, is proven to be practical for biosensing and nanophotonics. However, the understanding of its temporal dynamics is still lacking. Metastructures are proposed as a setup to explore this, as they are optically active and can be built massively. The proposed mechanism involves photothermal responses creating anisotropic permittivity modulations, leading to time-dependent chiral imprinting on metastructures. This effect has not been observed yet, but can be achieved through modern experimental approaches. The implications of these chiral time-dependent metastructures are vast and can lead to numerous applications.
APPLIED PHYSICS REVIEWS
(2023)
