Article
Chemistry, Multidisciplinary
Alessandra Di Gaspare, Valentino Pistore, Elisa Riccardi, Eva A. A. Pogna, Harvey E. Beere, David A. Ritchie, Lianhe Li, Alexander Giles Davies, Edmund H. Linfield, Andrea C. Ferrari, Miriam S. Vitiello
Summary: This study demonstrates mode-locking in surface-emitting electrically pumped random quantum cascade lasers at terahertz frequencies by exploiting the giant third-order nonlinearity of semiconductor heterostructure lasers and the nonlinear properties of graphene. Self-induced phase-coherence between naturally incoherent random modes and phase-locked random modes are achieved using lithographically patterning a multilayer graphene film or coupling a saturable absorber graphene reflector. This milestone in the physics of disordered systems paves the way for miniaturized, electrically pumped mode-locked light sources for various applications.
Review
Optics
Kuankuan Ren, Chunhe Li, Zebo Fang, Fei Feng
Summary: Electrically pumped nanolasers have achieved exciting achievements in optoelectronic chips, information storage, and biosensing, and show great potential for various applications. However, there is a lack of in-depth and comprehensive review on the recent development of electrically pumped nanolasers. In this review, a detailed overview of electrically pumped nanolasers is provided, including single nanolaser, nanoarray lasers, nanobeam lasers, and plasmonic nanolasers with different cavity structures. The challenges and problems restricting their development are summarized, along with proposed solutions and development directions. This review will provide valuable insights for optimizing the device structure of electrically pumped nanolasers with new high-gain semiconductor materials and further promote their rapid application development.
LASER & PHOTONICS REVIEWS
(2023)
Review
Optics
Anqi Liu, Gangyun Guan, Xiaomei Chai, Nannan Feng, Min Lu, Xue Bai, Yu Zhang
Summary: The rapid development of lasers has greatly contributed to the advancement of optical technology and natural science. Perovskite lasers, with their unique light absorption and emission properties, have immense potential in various applications. This review provides a comprehensive overview of perovskite lasers, focusing on their device structure, working principle, and recent advancements in pulsed optically pumped and electrically pumped lasers. The challenges and progress towards electrically pumped perovskite lasers are also emphasized.
LASER & PHOTONICS REVIEWS
(2022)
Article
Engineering, Electrical & Electronic
Pierluigi Debernardi, Andrea Simaz, Alberto Tibaldi, Benjamin Boisnard, Thierry Camps, Francesco Bertazzi, Michele Goano, Benjamin Reig, Jean-Baptiste Doucet, Veronique Bardinal
Summary: Based on preliminary experiments, we designed a tunable 850 nm laser using a hybrid combination of a liquid crystal micro-cell with nanoimprinted grating and an electrically-pumped GaAs half-VCSEL. The challenging optical design includes tolerances of the hybrid technology, presence of metals in the cavity, and the need for single fundamental extraordinary mode emission over the whole tuning range. By introducing the concept of anisotropic transverse confinement design, we ensured proper operation. The overall performance was verified by our multiphysics VCSEL suite, predicting side mode suppression ratio and optical power under all working conditions for liquid crystals with different clearing temperatures. The results demonstrate that these lasers are viable tunable sources with interesting performance and complementary features compared to other technologies.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
Article
Nanoscience & Nanotechnology
Bahareh Marzban, Lukas Seidel, Teren Liu, Kui Wu, Vivien Kiyek, Marvin Hartwig Zoellner, Zoran Ikonic, Joerg Schulze, Detlev Grutzmacher, Giovanni Capellini, Michael Oehme, Jeremy Witzens, Dan Buca
Summary: SiGeSn materials show great potential for mid-infrared applications. In this study, an electrically pumped GeSn microring laser based on SiGeSn/GeSn heterostructures is demonstrated. The ring shape allows for enhanced strain relaxation, leading to improved optical properties and carrier guiding. Partial undercutting of the ring further promotes strain relaxation while maintaining adequate heat sinking. Lasing is achieved at temperatures up to 90 K, with a T0 of 75 K. The scaling of the threshold current density with the inverse of the outer circumference is attributed to optical losses at the etched surface. The results of this study will guide further optimization of the device towards improving electrical injection and increasing the bandgap directness of the active material using stressors.
Article
Optics
Yu Huang, Pei Zhou, NianQiang Li
Summary: A high-speed secure key distribution (SKD) scheme based on polarization-keying chaos synchronization in vertical-cavity surface-emitting lasers (VCSELs) is proposed and demonstrated numerically; high-quality chaos synchronization can be achieved without external feedback when response lasers have the same polarization ellipticity; the open-loop configuration in commonly driven lasers results in a short synchronization recovery time, enabling a 1.34 Gb/s SKD with a low bit error ratio.
Article
Engineering, Electrical & Electronic
Farhad Foroozandeh, Martin T. Hill
Summary: A Metal-insulator-metal (MIM) waveguide structure that propagates a plasmon gap like mode and allows for electrically pumped amplification via semiconductor pathways has been proposed and investigated through simulations. The proposed structure enables precise definition of the waveguide core by lithography and dry etching, with active semiconductor surfaces exposed early in the fabrication process for good passivation. Compared to previous architectures, the proposed structures exhibit optical confinement and losses at a comparable level.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Min-Woo Kim, Sun-Wook Park, Kyong-Tae Park, Byung-Ju Min, Ja-Hyun Ku, Jin-Yong Ko, Jin Sik Choi, You-Shin No
Summary: This study presents an all-graphene-contact, electrically pumped, transferrable NW source that overcomes practical challenges of on-demand light sources in a photonic integrated circuit (PIC). The highly accurate microtransfer printing technique is employed to fabricate this source, and electroluminescence spectroscopy confirms strong emission and waveguiding properties. The precise integration of a single NW device into an existing photonic waveguide is achieved, supported by three-dimensional numerical simulations.
Article
Optics
Yuanlong Fan, K. Alan Shore, Xiaopeng Shao
Summary: This paper presents the first theoretical treatment of the dynamics of electrically pumped nano-laser arrays, focusing on two specific forms: a three-element linear array and triangular arrays. The Purcell effect and the optical coupling in nano-lasers result in novel dynamical behaviors. Two-dimensional portraits offer a convenient means to determine the dynamics accessible by varying the laser drive current.
Article
Engineering, Electrical & Electronic
C. Paranthoen, C. Levallois, G. Brevalle, M. Perrin, A. Le Corre, N. Chevalier, P. Turban, C. Cornet, H. Folliot, M. Alouini
Summary: This study demonstrates the first vertical cavity surface emitting laser (VCSEL) based on InAs quantum dots (QDs) on InP, achieving continuous wave operation at room temperature with low threshold and wavelength tuning capabilities. The QDs exhibit a high density per layer and a thin spacing layer for enhanced modal gain within the VCSEL cavity. Additionally, wavelength tuning experiments show laser emission in a large spectral window with stable output polarization state.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2021)
Article
Optics
Chen Shang, Kaiyin Feng, Eamonn T. Hughes, Andrew Clark, Mukul Debnath, Rosalyn Koscica, Gerald Leake, Joshua Herman, David Harame, Peter Ludewig, Yating Wan, John E. Bowers
Summary: The monolithic integration of quantum dot gain materials onto Si photonic platforms is a promising solution for on-chip light sources. In this study, the researchers successfully grew electrically pumped quantum dot lasers on patterned Si wafers, overcoming the challenges posed by the template architecture and achieving good laser performance and efficient light coupling.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Optics
Yao Zeng, Yu Huang, Pei Zhou, Penghua Mu, Nianqiang Li
Summary: We report on the manipulation of extreme events (EEs) in a slave spin-VCSEL subject to chaotic optical injection from a master spin-VCSEL. Injection parameters can regularly trigger, enhance, or suppress the relative number of EEs in the slave spin-VCSEL, where large ranges of enhanced vectorial EEs and average intensity of both vectorial and scalar EEs can be achieved with suitable parameter conditions. The probability of occurrence of EEs in the slave spin-VCSEL is associated with the injection locking regions, outside which enhanced relative number of EEs regions can be obtained and expanded with augmenting the complexity of the initial dynamic state of the slave spin-VCSEL.
Article
Engineering, Electrical & Electronic
Wensong Li, Yulun Wu, Shihang Xu, Peng Wang, Yuan Chen, Dawid Piatkowski
Summary: Researchers have successfully developed a blue dual-wavelength pumping method for directly diode-pumped Holmium-doped ZrF4-BaF2-LaF3-AlF3-NaF (Ho:ZBLAN) fiber lasers. This study is of great significance for expanding the application of dual-wavelength pumping to visible laser systems with energy-level structures consisting of long-lived lower-level bottlenecks.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Antonio Consoli, Pedro David Garcia, Cefe Lopez
Summary: Electrically pumped random lasers with distributed feedback can be obtained by introducing random defects into the device active layer, modifying the epitaxial growth process and losing the ease of fabrication potentially offered by disordered structures. We recently demonstrated an alternative and more practical approach in which random lasing emission is obtained from a modified Fabry-Perot laser diode after pulsed laser ablation of its output mirror. Here, we improve our fabrication technique by sweeping the ablating laser beam along the output mirror at different speeds and with different pulse energies, obtaining control over the total energy delivered at each point. We optimize the ablation parameters by evaluating the device performances in terms of lasing threshold and output power and we present the device emission characteristics. The proposed technique is tunable, fast and reliable, allowing the fabrication of devices with different properties by proper selection of the ablation parameters.
Article
Engineering, Electrical & Electronic
Chun-Yu Cho, Yung-Fu Chen
Summary: An efficient CW mid-infrared laser with a tunable wavelength range from 3 to 4.5 μm is achieved using an intracavity optical parametric oscillator (ICOPO). The self-modulation effect caused by Nd-doped gain medium is eliminated by using an optically pumped semiconductor laser (OPSL) as the pumped laser gain medium. The mode hopping issue is addressed by using the flip-chip packaging method for the OPSL gain chip. The experimental results confirm the true CW and mode-hop-free quality of the laser.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Qiuhong Min, Jing Lei, Xin Guo, Ting Wang, Qihua Yang, Dacheng Zhou, Xue Yu, Siu Fung Yu, Jianbei Qiu, Qiuqiang Zhan, Xuhui Xu
ADVANCED FUNCTIONAL MATERIALS
(2020)
Article
Engineering, Civil
Yong Pang, Siva N. Lingamanaik, Bernard K. Chen, Siu Fung Yu
ENGINEERING STRUCTURES
(2020)
Article
Chemistry, Physical
Ting Wang, Ze Yang, Liuli Yang, Xue Yu, Litao Sun, Jianbei Qiu, Dacheng Zhou, Wei Lu, Siu Fung Yu, Yue Lin, Xuhui Xu
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2020)
Article
Materials Science, Characterization & Testing
Yong Pang, Bernard K. Chen, Wencheng Liu, Siu Fung Yu, Siva N. Lingamanaik
NDT & E INTERNATIONAL
(2020)
Article
Optics
Yong Pang, Bernard K. Chen, Siu Fung Yu, Siva N. Lingamanaik
Article
Optics
Xuhui Xu, Wei Lu, Ting Wang, Wei Gao, Xue Yu, Jianbei Qiu, Siu Fung Yu
Article
Chemistry, Physical
Mengfeifei Jin, Wei Gao, Xiaojuan Liang, Ying Fang, Siufung Yu, Ting Wang, Weidong Xiang
Summary: Perovskite materials have been widely studied for their potential as optical gain media, but face challenges due to unstable structures and phase decomposition. By embedding CsPbXs nanocrystals in a glassy matrix and doping Br- ions in CsPbIs nanocrystals, the optical efficiency and gain properties were significantly improved, leading to the realization of red random lasing. Moreover, perovskite nanocrystal glasses show strong water stability, promising applications in high-definition displays and photonic devices.
Article
Chemistry, Multidisciplinary
Wei Gao, Ting Wang, Jiangtao Xu, Ping Zeng, Wenfei Zhang, Yunduo Yao, Changsheng Chen, Mingjie Li, Siu Fung Yu
Summary: By depositing CsPbBr3 perovskite quantum dots onto Ni porous foam, a flexible laser with strong mechanical strength and high thermal conductivity is realized, capable of maintaining laser intensity even after bending. This flexible laser is also an ideal light source for producing speckle-free micro-images.
Article
Chemistry, Multidisciplinary
Weiqing Chen, Min Zhou, Yang Liu, Xue Yu, Chaojie Pi, Ze Yang, Hao Zhang, Zhichao Liu, Ting Wang, Jianbei Qiu, Siu Fung Yu, Yang (Michael) Yang, Xuhui Xu
Summary: A novel perovskite polymer-ceramics scintillator with high transparency and quality is designed for flexible and refreshable X-ray imaging, achieved through a nucleation inhibition strategy. This scintillator-based detector boasts a high detection limit and spatial resolution, overcoming the long operation lifetime issue of perovskites-based scintillators.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Multidisciplinary Sciences
Yan Shao, Wei Gao, Hejin Yan, Runlai Li, Ibrahim Abdelwahab, Xiao Chi, Lukas Rogee, Lyuchao Zhuang, Wei Fu, Shu Ping Lau, Siu Fung Yu, Yongqing Cai, Kian Ping Loh, Kai Leng
Summary: In this study, the surface octahedral tilt of exfoliated 2D Ruddlesden-Popper perovskites (RPPs) was directly observed using scanning tunneling microscopy (STM), which was found to agree with theoretical calculations. The surface-enhanced octahedral tilt is correlated to excitonic redshift observed in photoluminescence (PL) and enhances inversion asymmetry and Rashba spin splitting.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Ceramics
Limin Jin, Xiaoli Yang, Siufung Yu, Puran Zheng, Xian Chen, Shumin Xiao, Qinghai Song
Summary: The research team demonstrated a single-mode UV laser based on UCNPs, which allows for precise wavelength tuning by adjusting the Littrow angle. This achievement offers a portable alternative for wideband-tunable UV lasers and opens up new opportunities for constructing compact solid-state UV photon sources.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Ting Wang, Weiqing Chen, Hok-Leung Loi, Wei Gao, Xuhui Xu, Longhui Zeng, Ping Kwong Cheng, Safayet Ahmed, Xue Yu, Feng Zhao, Jianbei Qiu, Feng Yan, Siu Fung Yu, Yuen Hong Tsang
Summary: An in situ growth strategy is explored to directly construct perovskite nanolasers inside PMMA fibers, paving the way for stable photonic integrated circuits (PICs).
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Wei Gao, Qi Wei, Ting Wang, Jiangtao Xu, Lyuchao Zhuang, Mingjie Li, Kai Yao, Siu Fung Yu
Summary: Researchers have achieved low-threshold upconversion lasing from two-dimensional Ruddlesden-Popper perovskite microflakes at low temperatures. These flakes have a giant two-photon absorption coefficient and self-formation of Fabry-Perot microcavities, enabling effective upconversion transition and lasing emission.
Article
Engineering, Environmental
Xuanyu Zhu, Xue Yu, Wei Gao, Haozhe Liu, Lin Nie, Haihong Guo, Feng Zhao, Siufung Yu, Ting Wang
Summary: This study explores the impact of heterojunctions on Dy3+-doped double perovskite Ba2LuNbO6 phosphor by constructing the corresponding matrix with nonstoichiometric ratio of Ba2+ ions. It is observed that the Dy3+ doped Ba2LuNbO6/LuNbO4 heterojunction exhibits a 31.5 times enhancement in photoluminescence intensity and a 141.4 times enhancement in radioluminescence intensity compared to the Ba2LuNbO6: Dy3+ counterpart. The cooperative effect of the heterojunction interface and the oxygen vacancy is found to contribute to the optical enhancement.
CHEMICAL ENGINEERING JOURNAL
(2022)
Review
Chemistry, Physical
Wei Gao, Siu Fung Yu
Summary: The current research focuses on the lasing performance of optically pumped perovskite lasers and the control of carrier transport and recombination properties. While challenges remain in fabricating electrically pumped perovskite lasers, a new manufacturing strategy based on the successful development of organic semiconductor laser diodes is proposed.
