Article
Engineering, Electrical & Electronic
Lu Xue, Xinzhi Sheng, Haoqiang Jia, Shuqin Lou
Summary: This study proposes an ultra-wide single-mode and low-flattened dispersion hollow-core negative-curvature terahertz waveguide. By introducing nested semi-elliptical tubes, single-mode guidance can be achieved with excellent performance and wide application potential.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Menghui He, Jiafu Zeng, Zhangxiong Chen, Xian Zhang, Xiaosong Zhu, Chengbin Jing, Chao Chang, Yiwei Shi
Summary: This article investigates and fabricates a flexible metallic polarization-maintaining (PM) hollow waveguide for transmitting linearly polarized terahertz (THz) radiation and flexible imaging. The waveguide achieves high birefringence and polarization maintenance, leading to high-resolution imaging.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Lu Xue, Xinzhi Sheng, Shuqin Lou, Guozhong Zhao, Shuai Yang, Zhen Xing, Haoqiang Jia
Summary: A novel high-birefringence and low-loss hollow-core antiresonant THz waveguide is proposed and experimentally demonstrated. Simulation results show high birefringence and low loss in the waveguide, which is verified through experimental measurements. This waveguide achieves the highest birefringence and relatively low loss in current THz waveguides.
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
(2022)
Article
Computer Science, Information Systems
Angela Coves, Haroldo Maestre, Raimon Archiles, Miguel Andres, Benito Gimeno
Summary: This paper presents a rigorous Surface Impedance (SI) formulation for planar waveguides, and verifies the accuracy and reliability of the formulation through comparative analysis.
Article
Engineering, Electrical & Electronic
Hao Sun, Bruno Taglietti, Yue Wang, Lawrence R. Chen
Summary: Bragg gratings (BGs) are widely used in microwave photonic signal processing and systems due to their customizable amplitude and phase responses. Waveguide BGs (WBGs) are compact and easily integrated with other components to build MWP systems. Subwavelength grating (SWG) waveguides and passive devices in silicon-on-insulator (SOI) have enabled the development of breakthrough devices based on anisotropic metamaterials.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Optics
Lukas Puts, Xaveer Leijtens, Pavel Cheben, Jens Schmid, Sander Reniers, Daniele Melati
Summary: The study demonstrates the anti-reflection properties of lithographically defined subwavelength gratings applied to integrated waveguides on the InP membrane-on-silicon platform. The use of gradient index effect creates a smooth index transition between core material and air, achieving reflections below -30 dB at a wavelength of 1550 nm. Experimental results show that relative reflections as low as -25 dB can be achieved using Mach-Zehnder interferometers as test structures.
Article
Optics
Jiaxin Chen, Jinzhao Wang, Jiewen Li, Yong Yao, Yunxu Sun, Jiajun Tian, Yi Zou, Xiangjie Zhao, Xiaochuan Xu
Summary: To address the limitations of current silicon photonics based optical phased arrays, researchers have proposed an ultra-long waveguide grating antenna utilizing subwavelength segments to achieve small beam divergence and large field-of-view. By leveraging the bound state in the continuum effect, sidewall emission is effectively suppressed. This concept was theoretically demonstrated with a millimeter-long through-etched waveguide grating antenna that has compatible feature sizes with existing silicon photonics foundries.
Article
Optics
Atefe Taheri, Mehrdad Shokooh-Saremi
Summary: This article introduces a periodic photonic lattice based on Guided-Mode Resonance (GMR) and proposes a method for homogenizing and analyzing the resonance effect. The method can be applied to multi-part period lattices under oblique incidence, taking into account the influence of asymmetry and the emergence of odd/even modes. Resonance lines obtained through this analysis method are useful for designing optical elements.
Article
Nanoscience & Nanotechnology
Tao Cui, Yan Shen, Ao Cheng, Runze Zhan, Zebo Zheng, Bo Tian, Jia Shi, Yanlin Ke, Lei Shao, Huanjun Chen, Shaozhi Deng
Summary: This study successfully prepared a high-quality single-crystalline Mo microrod waveguide structure and utilized subwavelength gratings to excite the surface plasmon polariton behavior of Mo. The optimized Mo microrod exhibited highly efficient waveguide performance.
Article
Engineering, Electrical & Electronic
Sipan Yang, Jinbin Xu, Yaqian Li, Liying Wu, Xueling Quan, Liucheng Fu, Min Liu, Zhengjie Wang, Xiulan Cheng
Summary: The ridge waveguide integrated grating couplers were designed, fabricated, and characterized in lithium niobate on insulator. The devices showed low coupling loss and a broad optical bandwidth, demonstrating potential functionalities for integrated optical waveguide devices based on thin-film lithium niobate.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Optics
Xiaoyuan Guo, Zi Wang, Yao Zhang, Yingjie Liu, Zimeng Zhang, Jiefeng Xu, Shumin Xiao, Qinghai Song, Ke Xu
Summary: An ultra-broadband multimode waveguide crossing based on subwavelength transmitarray (SWTA) is proposed, which exhibits high transmittance in the propagation direction and excellent confinement in its orthogonal direction. The crossing, designed and fabricated on silicon on insulator, has a compact footprint of only 5.05 μm x 5.05 μm and operates over a large bandwidth from 1.4 to 2.1 μm with an excess loss of less than 0.77 dB. This ultra-broadband and compact multimode crossing enables dense cross connection of waveguides with large data capacity via wavelength and mode division multiplexing.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Yanyan Li, Beijie Shao, Yujie Peng, Junyu Qian, Wenkai Li, Xinliang Wang, Xingyan Liu, Xiaoming Lu, Yi Xu, Yuxin Leng, Ruxin Li
Summary: We demonstrate an ultra-broadband high temporal contrast infrared laser source by cascaded optical parametric amplification, hollow-core fiber (HCF), and second harmonic generation processes. It expands the spectrum of a 1.8μm laser pulse to 1μm by filling the HCF with argon gas. With frequency doubling and dispersion compensation, 9.6 fs pulses centered at 910 nm with a full bandwidth over 300 nm and excellent energy stability of 0.8% (root mean square) over 20 min are generated. The temporal contrast is >10^12 at -10 ps before the main pulse. This laser with excellent temporal and spatial characteristics and stability can be used as a good seed source for ultra-intense and ultrafast laser systems.
HIGH POWER LASER SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Yuan-Feng Zhu, Xiang-Yu Zuo, Peiguang Yan, Dan-Dan Ji, Yun-Hao Xu, Xingfang Luo
Summary: We propose a novel nodeless conjoined-tube hollowcore fiber (CT-HCF) with elliptical arcs to reduce light leakage. Numerical simulations show that this fiber can significantly reduce fiber loss over a wide bandwidth. The proposed fiber has lower confinement losses and shows good single-mode performance.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Simei Mao, Lirong Cheng, Caiyue Zhao, H. Y. Fu
Summary: In this work, an ultra-broadband and ultra-compact polarization beam splitter (PBS) is proposed on a standard silicon-on-isolator platform. The PBS covers multiple bands with insertion losses less than 0.8 dB and extinction ratios larger than 10.9 dB within the wavelength range of 1260-1680 nm.
Article
Optics
YiFeng Hong, AnQing Jia, ShouFei Gao, YuLin Sheng, XiaoSong Lu, Zhi Liang, Zhe Zhang, Wei Ding, YingYing Wang
Summary: This article reports on the design, fabrication, and characterization of a low-loss birefringent semi-tube anti-resonant hollow-core fiber. The optimized structure design and fabrication technique resulted in a transmission loss of 4.8 dB/km at 1522 nm, a <10 dB/km bandwidth of 154 nm, and a phase birefringence of 1.8 x 10-5. Compared to previously reported fibers, this achieved loss is more than one order of magnitude lower and the bandwidth is one order of magnitude broader. The developed semi-tube AR-HCF, with its single mode and low dispersion features, may find various applications in frequency metrology, interferometric fiber gyroscopes, and long-baseline stellar interferometry.
Review
Optics
Pengfei Qiao, Weijian Yang, Connie J. Chang-Hasnain
ADVANCES IN OPTICS AND PHOTONICS
(2018)
Article
Optics
Kun Li, Yi Rao, Chris Chase, Weijian Yang, Connie J. Chang-Hasnain
Article
Optics
Kevin T. Cook, Pengfei Qiao, Jipeng Qi, Larry A. Coldren, Connie J. Chang-Hasnain
Article
Multidisciplinary Sciences
Abdoulaye Ndao, Liyi Hsu, Jeongho Ha, Jun-Hee Park, Connie Chang-Hasnain, Boubacar Kante
NATURE COMMUNICATIONS
(2020)
Article
Engineering, Electrical & Electronic
Zain Zaidi, Vala Fathipour, Xiangli Jia, Connie Chang-Hasnain
Summary: This article introduces a new arithmetic approach for multiwavelength phase unwrapping, demonstrating precise metrology through unwrapping interferometric phases in experiments and reconstructing three-dimensional scenes.
IEEE PHOTONICS JOURNAL
(2021)
Editorial Material
Engineering, Electrical & Electronic
Gabriella Bosco, Connie J. Chang-Hasnain, Thomas G. Giallorenzi, Alan E. Willner, Peter J. Winzer
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Proceedings Paper
Optics
Jiaxing Wang, Yipeng Ji, Zhuokai Yang, Huawen Hu, Jianqiang Chen, Haolin Li, Fangzhou Li, Shasha Li, Jonas Kapraun, ChihChiang Shen, Connie J. Chang-Hasnain
Summary: This study demonstrates a record-breaking transmission distance of 300m for 106 Gbps PAM4-encoded data by 850-nm VCSELs using a high contrast grating. This achievement is attributed to the reduced spectral widths, resulting in lower dispersion and a high value of bandwidth-distance product 32Tbps-m.
2022 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Nir Shitrit, Kevin T. Cook, Jonas Kapraun, Jipeng Qi, Jiaxing Wang, Connie J. Chang-Hasnain
2020 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
Yipeng Ji, Mingyue Guan, Jipeng Qi, Connie J. Chang-Hasnain
2020 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
Xiangli Jia, Yipeng Ji, Connie Chang-Hasnain
2020 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2020)
Article
Engineering, Biomedical
Yi-Cheng Liu, Christina Thantrakul, Shu Kan, Connie Chang-Hasnain, Dong-Ru Ho
IEEE JOURNAL OF TRANSLATIONAL ENGINEERING IN HEALTH AND MEDICINE
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
Connie J. Chang-Hasnain
2019 24TH MICROOPTICS CONFERENCE (MOC)
(2019)
Proceedings Paper
Engineering, Electrical & Electronic
Jonas Kapraun, Jiaxing Wang, Jipeng Qi, Kevin Cook, Emil Kolev, Connie J. Chang-Hasnain
2019 COMPOUND SEMICONDUCTOR WEEK (CSW)
(2019)
Proceedings Paper
Engineering, Electrical & Electronic
Kevin T. Cook, Pengfei Qiao, Jipeng Qi, Larry A. Coldren, Connie J. Chang-Hasnain
2018 IEEE INTERNATIONAL SEMICONDUCTOR LASER CONFERENCE (ISLC)
(2018)
Proceedings Paper
Engineering, Electrical & Electronic
Pengfei Qiao, Kevin T. Cook, Jipeng Qi, Larry A. Coldren, Connie J. Chang-Hasnain
2018 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)
(2018)
