Article
Multidisciplinary Sciences
Song Han, Yunda Chua, Yongquan Zeng, Bofeng Zhu, Chongwu Wang, Bo Qiang, Yuhao Jin, Qian Wang, Lianhe Li, Alexander Giles Davies, Edmund Harold Linfield, Yidong Chong, Baile Zhang, Qi Jie Wang
Summary: In this study, an electrically pumped topological laser based on photonic Majorana zero mode is implemented on a quantum cascade chip. The laser emits a topologically nontrivial cylindrical vector beam from a terahertz semiconductor laser. This electrically driven topological laser represents an important breakthrough for converting electricity into THz single-mode laser with nontrivial beams.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Ying Liu, Tao Jiang, Zhiqiang Zhan, Xuemin Wang, Jiawen Luo, Jia Li, Fengwei Chen, Liping Peng, Weidong Wu
Summary: This study investigates and applies the high-order tilted asymmetric surface grating (TASG) to quantum cascade lasers (QCLs) for the first time. The TASG with a 16-degree tilted grating in the middle of the ridge exhibits a 4% higher longitudinal mode loss difference compared to the uniform grating (UNG), resulting in better single mode selectivity in reflectance spectrum. Experimental results show that the TASG distributed feedback (DFB) QCL maintains more stable single longitudinal mode performance with increasing current and temperature, while the UNG QCL with equivalent coupling coefficient exhibits mode jumping. The feasibility and superiority of TASG in mid-infrared active devices are demonstrated.
Article
Chemistry, Physical
Bartosz Janaszek, Pawel Szczepanski
Summary: This work investigates light generation in a DFB laser with a hyperbolic medium and active material, forming a 1D photonic hypercrystal. By tuning effective dispersion, laser action can be controlled for single-frequency generation with high side-mode suppression and controllable wavelength of operation. Additionally, a new mechanism for laser amplitude modulation via voltage-controllable dispersion of hyperbolic medium is presented.
Article
Computer Science, Information Systems
Bin Li, Qingpeng Wang, Qizheng Wang, Yitong Huang
Summary: A highly integrated methane-detection system was established using a distributed feedback laser diode and hollow-core photonic crystal fiber. The system generated a modulated optical signal in a fiber-coupled gas cell and processed the return optical signal containing gas concentration information. The experiments demonstrated good performance, with a low detection limit of 29.52 ppm and excellent long-term stability. The system has potential for optimizing and applying in paddy fields for methane concentration detection and monitoring using optical fibers.
Article
Multidisciplinary Sciences
Olivier Spitz, Andreas Herdt, Jiagui Wu, Gregory Maisons, Mathieu Carras, Chee-Wei Wong, Wolfgang Elsaesser, Frederic Grillot
Summary: Mid-infrared free-space optical communication has great potential for high-speed communication, but data security remains a major challenge. This study demonstrates the use of chaos synchronization in a QCL-based free-space link to enhance the privacy of transmissions.
NATURE COMMUNICATIONS
(2021)
Article
Optics
Xing-Guang Wang, Bin-Bin Zhao, Yu Deng, Vassilios Kovanis, Cheng Wang
Summary: This study demonstrates that destabilizing quantum cascade lasers can be achieved using optical feedback with a tilted angle, leading to three types of nonlinear dynamics. Small tilted angles result in periodic oscillations, moderate angles result in quasiperiodic oscillations, and large angles result in low-frequency oscillations. This type of dynamics is not observed with well-aligned optical feedback.
Article
Optics
Di Liang, Sudharsanan Srinivasan, Antoine Descos, Chong Zhang, Geza Kurczveil, Zhihong Huang, Raymond Beausoleil
Summary: The paper presents a 1310 nm heterogeneous quantum-dot distributed feedback laser on silicon with high efficiency and modulation capability, demonstrating isolator-free external modulation at 25 Gb/s using a metal-oxide semiconductor capacitor microring modulator.
Article
Physics, Applied
Joosun Yun, Tsung-Tse Lin, Hideki Hirayama
Summary: In this study, surface-emitting photonic crystal terahertz quantum cascade lasers adopting a double metal waveguide were investigated. The results showed that the lasers with triangular prism photonic crystal slabs have the potential to achieve high light-extraction efficiency with Gaussian beam shape even with compact chip size and high active region occupancy.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Joel Q. Grim, Ian Welland, Samuel G. Carter, Allan S. Bracker, Andrew Yeats, Chul Soo Kim, Mijin Kim, Kha Tran, Igor Vurgaftman, Thomas L. Reinecke
Summary: We demonstrate the scattering of laser light from two InAs quantum dots coupled to a photonic crystal waveguide by strain-tuning the optical transitions of the dots into mutual resonance. The nonlinearity is enhanced by scattering laser light from two dots, providing a means of manipulating few-photon optical nonlinearities. This approach also establishes opportunities for multiemitter quantum optics in a solid-state platform.
Article
Materials Science, Multidisciplinary
Peter Claronino, Rahul Jayaprakash, Till Jessewitsch, Rachel C. Kilbride, Timothy Thornber, Alina Muravitskaya, Robert D. J. Oliver, Ullrich Scherf, Jean-Sebastien G. Bouillard, Ali M. Adawi, David G. Lidzey
Summary: In this study, we demonstrate that increasing the binaphthyl (BN) spacer content in polydioctylfluorene (PFO) can lower the lasing threshold of optically pumped organic lasers by suppressing intermolecular interactions. We utilize laser patterning technique to create physical defects within a vertical microcavity, which enhances the performance and improves the cavity Q-factor of the laser device. These findings suggest the potential of this defect microcavity as an architecture for electrically-pumped laser devices.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Nanoscience & Nanotechnology
Minsu Kang, Jin Heesoo, Heonsu Jeon
Summary: Projection photolithography using extreme-ultraviolet light source is crucial for fabricating nanoscale patterns for electronic chips, but not necessary for photonics. A cost-effective and high-throughput lithographic technique for submicron pattern generation is in high demand. The maskless digital photolithography (MDPL) technique has shown promise in addressing this demand and has been successfully used to fabricate submicron periodicity photonic crystal patterns.
Article
Optics
Zhenzhen Xu, Kaifei Tang, Xiang Ji, Zhenxing Sun, Yaguang Wang, Ziming Hong, Pan Dai, Rulei Xiao, Yuechun Shi, Xiangfei Chen
Summary: A simple and energy-efficient photonic convolutional accelerator based on a monolithically integrated multi-wavelength distributed feedback semiconductor laser using the superimposed sampled Bragg grating structure is proposed and experimentally demonstrated. The accelerator operates at a high speed of 44.48 billion operations per second and generates real-time recognition of 100 images for a 2 x 2 kernel with a convolutional window vertical sliding stride of 2. Additionally, it achieves a prediction accuracy of 84% on the MNIST database of handwritten digits.
Article
Nanoscience & Nanotechnology
Michael Jaidl, Maximilian Beiser, Miriam Giparakis, Martin Alexander Kainz, Dominik Theiner, Benedikt Limbacher, Marie Christine Ertl, Aaron Maxwell Andrews, Gottfried Strasser, Juraj Darmo, Karl Unterrainer
Summary: This study presents a heterogeneous terahertz quantum cascade laser consisting of five individual active regions based on a three-well, LO-phonon depopulation design. The lasers can operate in both pulsed and continuous-wave modes, emitting in a spectral range from 1.9 to 4.5 THz, with broad bandwidth.
Article
Engineering, Electrical & Electronic
Yuanhao Zhang, Fan Yang, Gonghai Liu, Guojiong Li, Minwen Xiang, Qiaoyin Lu, John F. Donegan, Weihua Guo
Summary: In this work, a 1.3-μm directly modulated laser with a ridge waveguide distributed feedback region and a buried waveguide spot-size-converter region was demonstrated. The integration of this spot-size-converter improved beam profile and power coupling efficiency, while the fabrication cost was reduced. The fabricated laser achieved a nearly circular beam profile and more than 70% improvement in power coupling.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Taojie Zhou, Mingchu Tang, Haochuan Li, Zhan Zhang, Yuzhou Cui, Jae-Seong Park, Markel Martin, Thierry Baron, Siming Chen, Huiyun Liu, Zhaoyu Zhang
Summary: In this work, we report the fabrication of 1.3μm InAs/GaAs quantum-dot photonic-crystal nanobeam lasers directly grown on Si substrates. These lasers exhibit ultra-low energy consumption and small modal volume, making them a promising candidate for on-chip light sources in Si photonic integrated circuits.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
