Article
Materials Science, Multidisciplinary
Petr Lazarenko, Vadim Kovalyuk, Pavel An, Sergey Kozyukhin, Viktor Takats, Alexander Golikov, Victoria Glukhenkaya, Yuri Vorobyov, Timur Kulevoy, Aleksey Prokhodtsov, Alexey Sherchenkov, Gregory Goltsman
Summary: Sn doping is an efficient approach to reduce the switching energy of Ge2Sb2Te5, optimize its properties, and enable fully optical multilevel reversible recording.
Article
Engineering, Electrical & Electronic
Zhihai Liu, Xiang Li, Yu Zhang, Wei Jin, Yaxun Zhang, Siying Cheng, Yaru Li, Libo Yuan
Summary: In this study, an all-optical controllable switch device with non-volatile, broadband adjustable, and bistable fast switching performance was proposed and demonstrated by integrating the phase-change material onto the optical fiber. This device is expected to enable fast and broadband optical routing and provide new storage and computing functionalities to optical fibers in the future.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Ziling Fu, Zhi Wang, Huiying Wang, Rui Jiang, Lanlan Liu, Chongqing Wu, Jian Wang
Summary: The combination of phase-change materials and integrated photonics allows for the development of new all-optical devices. Understanding the fluctuations in refractive index during phase-switching is crucial for optimal device operation. Simulation results show good agreement with calculations, and the crystallization fraction and refractive index change of the PCM cell are investigated. Proper setting of optical pulses is necessary for specific devices.
Article
Chemistry, Multidisciplinary
Xing Yang, Liangjun Lu, Yu Li, Yue Wu, Ziquan Li, Jianping Chen, Linjie Zhou
Summary: Integrated Mach-Zehnder interferometers (MZIs) with phase-change materials offer low power consumption and compact size for reconfigurable photonic processors. However, they suffer from low optical extinction ratio and limited switching cycles due to material loss and poor reversible repeatability. A non-volatile electrically reconfigurable MZI with a low-loss phase-change material (Sb2Se3) encapsulated in Al2O3 layers is demonstrated. By dividing the Sb2Se3 patch into small sub-cells to restrict material reflow, more than 10,000 reversible phase-change cycles and 6-bit multilevel switching states are achieved.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Optics
Xing Yang, Muhammad Shemyal Nisar, Wei Yuan, Fengang Zheng, Liangjun Lu, Jianping Chen, Linjie Zhou
Summary: This Letter demonstrates a 2 x 2 nonvolatile silicon Mach-Zehnder optical switch enabled by low-loss phase change material Sb2S3, which can switch optical transmission between bar and cross paths without requiring static power to maintain the phase state. It shows promising applications in optical switch matrices and reconfigurable optical circuits.
Article
Chemistry, Multidisciplinary
Kun Yin, Yang Gao, Hao Shi, Shiqiang Zhu
Summary: In this study, an ultra-compact integrated optical switch based on phase-change materials (PCMs) is proposed. The device utilizes a pixelated sub-wavelength structure to achieve customized refractive indices, leading to improved performance. The simulation results show that the device has a low insertion loss and a high extinction ratio.
Article
Optics
Linying Cai, Yegang Lu, Honghui Zhu
Summary: We propose a novel nonvolatile 1x2 optical switching and multi-level memory based on a GST slot-assisted microring resonator (MRR). The device demonstrates low insertion losses and high extinction ratios at different states. By modifying the length of the feedback loop, the free spectral range can be expanded, allowing for reliable multi-level storage.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Haiyan Shang, Mingjie Zhang, Dandan Sun, Yan-Ge Liu, Zhi Wang, Dong Liu, Siqing Zeng
Summary: Research shows that Ge25Sb10S65 glass has greater hardness and stronger resistance to laser damage, making it suitable for on-chip integrated devices and applications in optical frequency combs or supercontinuum generation.
RESULTS IN PHYSICS
(2021)
Article
Physics, Applied
Fei Yang, Yue Tao, Le Zhang, Junnan Han, Xincheng Cao, Zhenguo Zhuo, Ziyue Zhu, Wenjin Liu, Yuehua Dai
Summary: GST alloy has the ability to quickly transform between the amorphous phase and the crystalline phase, making it suitable for non-volatile phase change storage. The amorphous state is characterized by octahedral and tetrahedral bonding configurations, while the crystalline state mainly contains four-membered rings formed by Ge-Te and Sb-Te. With the growth of crystallization time, the optical properties of GST, including absorption coefficient, reflectivity, and conductivity, are significantly improved.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Computer Science, Hardware & Architecture
Shaojuan Zhang, Rafael Kraemer, Xuwei Xue, Netsanet Tessema, Henrique Freire Santana, Eduward Tangdiongga, Nicola Calabretta
Summary: Optical wireless data center networks (OW-DCNs) utilize optical wireless technology and optical wired switching technology to eliminate cable complexity and create high bandwidth interconnections. This research proposes an OW-DCN system based on arrayed waveguide grating routers and fast tunable transmitters (T-TXs) that employ photonic integrated circuit multicast switches (PIC-MCSs) for nanosecond-scale fast optical switching, multicast operation, T-TX sharing, and dynamic bandwidth allocation. Experimental results validate its lossless, nanosecond, and multicast switching capabilities, as well as its dynamic bandwidth allocation and optical packet switching capability.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2023)
Article
Optics
Danfeng Zhu, Xueyu Wang, Jing Li, Han Ye, Zhongyuan Yu, Yumin Liu
Summary: A compact and nonvolatile polarization-rotating optical switch based on GSST waveguide is proposed and demonstrated in this paper. The switch shows competitive performances and the intermediate states of GSST are investigated. This work provides a viable scheme for the integration of polarization diversity circuits for optical routing on chip.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
D. V. Bochek, D. A. Yavsin, A. B. Pevtsov, K. B. Samusev, M. F. Limonov
Summary: The study reports the creation and examination of Ge2Sb2Te5 metasurfaces on sapphire substrates using the ablation method and optical diffraction, showing the capability of optical technique in assessing metasurface quality, determining structural symmetry, and identifying structural elements and lattice constants. The accuracy of the optical technique is confirmed through comparison with SEM and AFM methods.
PHOTONICS AND NANOSTRUCTURES-FUNDAMENTALS AND APPLICATIONS
(2021)
Article
Physics, Multidisciplinary
Shuyuan Lv, Xinhui Li, Wenfeng Luo, Jie Jia
Summary: This article presents the design of achromatic metasurface optical devices based on the phase-change material Ge2Sb2Te5 (GST), enabling focusing and beam deflection in the longer-infrared wavelength range. By adjusting material properties and crystalline fraction, polarization-insensitive achromatic metalenses and beam deflectors are achieved. This approach provides new ideas for designing achromatic metasurfaces and potential integration in optical imaging and coding systems.
Article
Engineering, Electrical & Electronic
Neeru Bala, Anup Thakur
Summary: In this study, doped Ge2Sb2Te5 alloys and thin films were prepared and their properties were investigated. The doped films retained amorphous structure and exhibited uniform and smooth morphology. Transmission spectra showed high transparency of the doped films in the near-infrared region. The doped GST thin films had a lower optical band gap compared to pure GST thin films.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Xiaoxi Wang, Shayan Mookherjea
Summary: A high-speed, low-loss modular cross-bar switching element suitable for single photons is demonstrated. It achieves entanglement preserving voltage-driven switching of single photons with ultra-fast and low-loss characteristics. The switch is well matched to the wavelength, bandwidth, and lifetime of photons generated by spontaneous four-wave mixing sources in silicon photonics, enabling reconfigurability of each single photon and addressing of each time bin.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Nghia Nguyen-Huu, Jaromir Pistora, Michael Cada, Trung Nguyen-Thoi, Youqiao Ma, Kiyotoshi Yasumoto, B. M. Azizur Rahman, Qiang Wu, Yuan Ma, Quang Hieu Ngo, Lin Jie, Hiroshi Maeda
Summary: Graphene has shown great potential in applications such as ultrafast photodetectors and transistors, with metallic deep gratings enhancing its absorptance up to 80% in the near infrared region. Utilizing a compound metallic grating structure can further enhance graphene's absorptance to 98% and expand its spectral bandwidth to 0.6 μm, demonstrating high design potential for optical and optoelectronic devices based on graphene.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
A. S. Sharbirin, M. K. A. Zaini, G. Brambilla, B. M. A. Rahman, K. T. Grattan, M. F. Ismail, H. Ahmad
Summary: The study demonstrated a 3D-printed tilt fiber sensor using a two-mode fiber interferometer for measuring different tilt angles with linear response. The sensor has a small form factor, simple design, cost-effectiveness, and lightweight, showing significant potential for various civil engineering applications.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Akhilesh K. Pathak, Charusluk Viphavakit, B. M. A. Rahman, Vinod Kumar Singh
Summary: This study presents and analyzes a highly sensitive refractive index sensor based on a microfluidic channel and Ag-graphene composite nanowire, achieving maximum wavelength and amplitude sensitivity of 13700 nm/RIU and 1026 RIU-1. The sensor not only solves oxidation issues, but also enhances sensitivity, providing better performance than similar sensors. Additionally, the study thoroughly investigates the effects of various parameters on the sensor's performance, laying groundwork for the design of real-time, highly sensitive, remote sensing, and distributed SPR based RI sensor.
IEEE PHOTONICS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
N. N. Ismail, M. S. M. Sa'ad, M. F. Ismail, M. K. A. Zaini, K. S. Lim, K. T. V. Grattan, G. Brambilla, B. M. A. Rahman, H. Mohamad, Harith Ahmad
Summary: The FBG-based inclinometer shows excellent linear response to a wide range of tilts; an additional FBG is included in the design for compensation of temperature changes; effective temperature correction has been achieved despite extreme temperature conditions likely to be experienced in the field.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Weifeng Jiang, Jinzhu Hu, Siqiang Mao, Hanyu Zhang, Linjie Zhou, B. M. Azizur Rahman
Summary: This study proposes a novel broadband silicon four-mode (de)multiplexer that can (de)multiplex TE0, TE1, TE2, and TE3 modes using subwavelength gratings-assisted triple-waveguide couplers. Experimental results show high bandwidth and low insertion loss, making it suitable for increasing the transmission capacity of on-chip optical interconnects.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Sneha Verma, Sunny Chugh, Souvik Ghosh, B. M. Azizur Rahman
Summary: This paper presents a new approach using Artificial Neural Network (ANN) to design and optimize electromagnetic plasmonic nanostructures. By simulating nanostructures using the Finite Element Method (FEM) and making predictions with Artificial Intelligence (AI), this method outperforms direct numerical simulations in predicting output for various input device parameters.
Review
Chemistry, Analytical
B. M. Azizur Rahman, Charusluk Viphavakit, Ratchapak Chitaree, Souvik Ghosh, Akhilesh Kumar Pathak, Sneha Verma, Natsima Sakda
Summary: The increasing use of nanomaterials and scalable, high-yield nanofabrication process is revolutionizing the development of novel biosensors. This review provides a comprehensive overview of major scientific achievements in nano-biosensors based on optical fiber, nanomaterials and terahertz-domain metasurface-based refractometric, labelled and label-free nano-biosensors.
Article
Optics
Haimiao Zhou, Lina Suo, Ya-Pei Peng, Fan Yang, Shijie Ren, Nan-Kuang Chen, Xinhe Lu, B. M. A. Rahman, K. T. V. Grattan
Summary: By utilizing charged nanoparticles to create a self-assembly surface corrugated grating and an external assisted grating, fiber few-mode interferometers were successfully made for the production of fiber temperature sensors. A maximum resonant wavelength shift of 4.6 nm was achieved over a temperature range from 20-60 degrees C, with a temperature sensitivity of 112.6 pm/degrees C, demonstrating high linearity in the results.
Article
Engineering, Electrical & Electronic
M. A. Alias, M. F. Ismail, M. S. M. Sa'ad, M. K. A. Zaini, K. S. Lim, K. T. Grattan, G. Brambilla, B. M. A. Rahman, S. A. Reduan, Harith Ahmad
Summary: This paper discusses the design and performance of an innovative high-precision extensometer system fabricated using 3D printing technology. The extensometer utilizes a 3D printed embedded Fiber Bragg Grating (FBG) strain sensor as its primary sensing element. The experimental results show that the extensometer can effectively measure strain variations with high linearity and excellent performance under different soil conditions.
IEEE SENSORS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
A. K. Pathak, B. M. A. Rahman, C. Viphavakit
Summary: This article proposes a novel approach to develop a highly sensitive surface plasmon resonance-based fiber optics biosensor. The sensor demonstrates high sensitivity and its performance is evaluated by analyzing various structural parameters and fabrication tolerance. The designed sensor shows high sensitivity for different refractive indexes.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Engineering, Electrical & Electronic
M. R. Karim, Nayem Al Kayed, Nusrat Jahan, M. Shah Alam, B. M. A. Rahman
Summary: A new type of suspended core tapered waveguide is proposed for supercontinuum generation in the midinfrared. By optimizing the waveguide dimensions and using different tapering methods, better spectral coverage and spectral flatness can be achieved.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Optics
Natsima Sakda, Ratchapak Chitaree, B. M. Azizur Rahman
Summary: Recent research has shown that integrating phase change materials into metasurface structures can modify their responsive properties in the THz regime, allowing for dynamic and customizable functionality.
Article
Chemistry, Analytical
Sneha Verma, B. M. A. Rahman
Summary: Photonics researchers are increasingly utilizing nanotechnology to exploit prevalent nanosized manufacturing technologies and investigate novel shape-optimized nanostructures. Hybrid nanostructures that integrate dielectric resonators with plasmonic nanostructures are offering new opportunities. In this work, a hybrid coupled nano-structured antenna with stacked multilayer lithium tantalate (LiTaO3) and Aluminum oxide (Al2O3) is explored, showing strong electromagnetic confinement and sensitivity response. Compared to a single metallic elliptical paired nanostructure, the hybrid nanostructure exhibits a roughly two-fold increase in sensitivity.
Review
Optics
Akhilesh Kumar Pathak, Sneha Verma, Natsima Sakda, Charusluk Viphavakit, Ratchapak Chitaree, B. M. Azizur Rahman
Summary: Optical sensing technologies for hydrogen monitoring are becoming increasingly important in connection with the development and expanded use of hydrogen. In the past decades, there has been a rapid development of optical sensors for hydrogen monitoring due to their excellent features. However, selecting the right hydrogen-selective metal and metal alloy is crucial. This review provides an overview of the recent progress in hydrogen monitoring, highlighting the sensing principles, advantages, limitations, and future development.
Article
Chemistry, Multidisciplinary
Francisco J. Cabrera-Espana, B. M. Azizur Rahman
Summary: This study explores the effects of short index-matched nanowires (NWs) on solar cells and how they are influenced by surface recombination. It further optimizes power conversion efficiency by stacking NWs of different heights and diameters, achieving PCEs of 16.8% and 17.55%. These findings contribute to the development of high-efficiency thin silicon solar cells.
