Article
Engineering, Electrical & Electronic
Zejie Yu, Hongnan Xu, Dajian Liu, Huan Li, Yaocheng Shi, Daoxin Dai
Summary: This paper reviews recent advances in high-performance silicon polarization-handling devices assisted with subwavelength structures. These devices have the characteristics of compact size, high performance, and wide bandwidth. The paper introduces different types of polarization-handling devices and their principles, and discusses the challenges and opportunities of silicon polarization-handling devices.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
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
Cameron M. Naraine, Jocelyn N. Westwood-Bachman, Cameron Horvath, Mirwais Aktary, Andrew P. Knights, Jens H. Schmid, Pavel Cheben, Jonathan D. B. Bradley
Summary: Subwavelength grating (SWG) metamaterial waveguides and ring resonators on a silicon nitride platform are proposed and demonstrated. The SWG waveguide achieves a large overlap (53%) of the Bloch mode with the top cladding material, showing great potential for evanescent field sensing and light amplification. Fabricated using a commercial rapid turn-around silicon nitride prototyping foundry process, the devices have critical dimensions greater than 100 nm. Experimental characterization reveals excellent internal quality factor (2.11 x 10(5)) and low propagation loss (approximately 1.5 dB cm(-1)) in the C-band, surpassing silicon-based SWG ring resonators. These results demonstrate the promising prospects of SWG metamaterial structures for silicon nitride based photonic integrated circuits.
LASER & PHOTONICS REVIEWS
(2023)
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
Chemistry, Physical
Thanakorn Yeamsuksawat, Yoshitaka Morishita, Jun Shirahama, Yintong Huang, Takaaki Kasuga, Masaya Nogi, Hirotaka Koga
Summary: This study proposes a method for solar thermal heating using biomass-derived carbons and designs subwavelength nanoporous and molecular structures to enhance solar light absorption and suppress reflection. By constructing cellulose nanofibers into nanopaper and carbonizing it at controlled temperatures, the tailored nanoporous and molecular structures are achieved. The results show that the semicarbonized nanopaper with tailored structures exhibits superior performance in solar thermal heating.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Chengkun Dong, Sijie Dai, Jun Xia, Guodong Tong, Zhihai Wu, Hao Zhang, Bintao Du
Summary: In this work, an ultracompact and high-performance silicon-based polarization splitter-rotator utilizing anisotropic metasurfaces is proposed. It combines the advantages of polarization sensitivity and polarization division multiplexing, making it suitable for on-chip applications. The device shows good performance in terms of conversion loss, polarization conversion ratio, cross talk, and reflection loss.
Article
Optics
Xu Han, Yongheng Jiang, Huifu Xiao, Mingrui Yuan, Thach Giang Nguyen, Andreas Boes, Guanghui Ren, Yong Zhang, Qinfen Hao, Yikai Su, Arnan Mitchell, Yonghui Tian
Summary: Grating-assisted contra-directional couplers are important optical components in photonic integrated circuits (PICs) and are used as fundamental building blocks for various applications. LNOI has emerged as an attractive PIC platform with multiple active photonic circuit components, but lacks some passive photonic circuit components. This study proposes, designs and experimentally demonstrates a subwavelength grating-assisted contra-directional coupler in a silicon nitride-loaded LNOI waveguide platform. A three-channel wavelength-division (de)multiplexer is fabricated and experimentally demonstrated using the proposed coupler.
LASER & PHOTONICS REVIEWS
(2023)
Article
Engineering, Electrical & Electronic
Lu Sun, Rui Hu, Zihan Zhang, Yu He, Yikai Su
Summary: This study proposes and demonstrates broadband power coupling and mode-order conversion based on trapezoidal subwavelength grating structures. The slowly varying trapezoidal subwavelength gratings enhance coupling efficiency and achieve efficient power transfer and mode conversion.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Review
Nanoscience & Nanotechnology
Jose Manuel Luque-Gonzalez, Alejandro Sanchez-Postigo, Abdelfettah Hadij-ElHouati, Alejandro Ortega-Monux, J. Gonzalo Wanguemert-Perez, Jens H. Schmid, Pavel Cheben, Inigo Molina-Fernandez, Robert Halir
Summary: The paper provides a comprehensive review of subwavelength metamaterials and their applications in silicon photonics. Through in-depth analysis of subwavelength geometry and review of latest applications, the focus is on how subwavelength structures improve device performance and expand the design space in silicon photonics.
Article
Engineering, Electrical & Electronic
Darpan Mishra, Manoranjan Minz, Ramesh Kumar Sonkar
Summary: This paper presents a subwavelength grating based multiplexer on a silicon photonics platform, which can multiplex three transverse electric modes. The designed device has broadband operation over the entire optical telecom bands, and shows good transmission characteristics.
NANO COMMUNICATION NETWORKS
(2023)
Article
Optics
Jia-Min Liu, De -Long Zhang
Summary: This paper proposes and models an ultra-broadband TM-pass waveguide polarizer based on a thin-film LiNbO3-on-insulator waveguide and sub-wavelength grating (SWG) metamaterials. The device consists of an SWG as a polarization filter, and two coupling regions to reduce mode mismatch loss. Simulation results show that the polarizer can achieve an ultra-large bandwidth of -415 nm (1.26-1.675 mu m) with low insertion loss (<1.1 dB) and high extinction ratio (>29.4 dB). Additionally, the proposed polarizer can tolerate deviations in the width and thickness of the nano-stripes by 5 nm. This ultra-broadband device may have applications in high-capacity optical communication systems, and it is the first of its kind proposed on the lithium-niobate-on-insulator platform, to the best of our knowledge.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Haoyu Wu, Yaohui Sun, Yue Zhou, Mengjia Lu, Tong Lin, Guohua Hu, Binfeng Yun, Yiping Cui
Summary: We propose a compact and broadband 2x2 3-dB adiabatic coupler using trapezoidal subwavelength gratings on a silicon-on-insulator platform. The device consists of two tapered waveguides composed of trapezoidal subwavelength gratings. The adiabatic mode evolution of the two lowest order transverse electric modes achieves broadband 3-dB optical power splitting with a coupling length of 24 μm. Using the finite time difference method, a power splitting ratio better than 3 +/- 0.21 dB and an insertion loss less than 0.19 dB are obtained in the wavelength range of 1450 nm to 1650 nm.
IEEE PHOTONICS JOURNAL
(2023)
Article
Chemistry, Analytical
Siim Heinsalu, Katsuyuki Utaka
Summary: We present two methods to improve wavelength sensitivity for multi-slot sub-wavelength Bragg grating refractive index sensors, achieving significant improvements compared to previous results.
Article
Optics
Mohammad Ali Shameli, Leila Yousefi
Summary: A new method utilizing multi-scale photonic topological insulators to enhance sunlight absorption in thin film solar cells is proposed in this paper, and full wave numerical analysis demonstrates significant improvement in short circuit current of the solar cell.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Energy & Fuels
Sushil Kumar
Summary: Recycling waste PV modules, especially thin film, has become important due to the fast development of the PV market and scarcity of semiconductor resources. New strategies utilizing chemical, thermal, and mechanical treatments were developed to extract TCO coated glass from thin film amorphous silicon PV end-of-life modules. The extracted TCO, identified as fluorine-doped tin oxide (FTO), showed excellent properties and potential for reuse in the fabrication of new thin film PV modules and other optoelectronic devices.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
Article
Chemistry, Inorganic & Nuclear
Qiong Wu, Yihao Wang, Pengfei Li, Shunhua Chen, Fufa Wu
Summary: In this study, MXene Ti3C2 was efficiently synthesized using microwave assisted selective etching, with hexagonal Ti3AlC2 as the precursor material. It was found that Ti3C2 prepared with hexagonal Ti3AlC2 exhibited superior electrochemical properties compared to those prepared with ordinary Ti3AlC2. The Ti3C2 electrode showed higher specific capacitance and lower resistance values, suggesting a potential strategy for enhancing the performance of supercapacitor electrodes.
DALTON TRANSACTIONS
(2022)
Article
Automation & Control Systems
Haidong Yang, Yusong Wu, Junsheng Zhang, Huohong Tang, Weijie Chang, Juchen Zhang, Shunhua Chen
Summary: In this study, the cutting characteristics of Zr57Cu20Al10Ni8Ti5 (at.%) bulk metallic glass (Zr57 BMG) were compared with industrial pure zirconium (Zr702) during high-speed machining (100-350 m/min). It was found that despite the higher strength of Zr57 BMG, there was no significant difference in the main cutting forces between the two materials, which was attributed to the thermal softening of Zr57 BMG during machining. Furthermore, the surface characteristics and chip morphology changed as the cutting speed increased, with the worst surface quality obtained at a speed of 250 m/min.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Chemistry, Physical
H. H. Tang, L. Meng, J. C. Zhang, H. D. Yang, J. S. Zhang, D. Zhou, W. J. Chang, S. H. Chen
Summary: This study investigated the plastic-flow dynamics of a Zr48Cu47.5Al4Co0.5 bulk metallic glass composite under varying strain rates and stress gradients. The results showed a self-similar structure in the distribution of plastic-flow serrations, with relatively high uniformity in Ep values and intrinsic large variations in L' values. The fractal dimensions of both Ep and L' values were found to be dependent on applied strain rates and stress gradients.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Instruments & Instrumentation
W. J. Chang, S. Y. Wang, H. H. Tang, B. L. Dong, Q. Yang, J. Y. Chen, S. H. Chen
Summary: This study designed a nanosecond pulse power supply with adjustable pulse frequency, duty cycle, and voltage, which can provide enhanced output current and improved pulse output waveform, resulting in better machining accuracy and efficiency for micro-ECM.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Chemistry, Analytical
Juchen Zhang, Shasha Song, Junsheng Zhang, Weijie Chang, Haidong Yang, Huohong Tang, Shunhua Chen
Summary: This paper introduces the application of vibration-assisted ECM method in machining blisk channels, and establishes a two-phase flow field model and multi-physics field coupling model to analyze the influence of vibration on the ECM process. Through comparative experiments and dynamic simulation, it is found that vibration-assisted channel ECM performs well in terms of machining stability and surface quality.
Article
Automation & Control Systems
Weijie Chang, Xiangxiang Li, Haidong Yang, Junsheng Zhang, Juchen Zhang, Huohong Tang, Shunhua Chen
Summary: This study compared the performance of a Zr-based BMG, heat-treated BMG, and industrial pure zirconium in WEDM. The results showed that both BMG and HBMG had better cutting efficiency and surface roughness compared to Zr702. The cutting efficiency and surface roughness of BMG were mainly dependent on its unique physical properties inherited from the metastable atomic structures. The key processing parameters affecting the cutting efficiency were pulse type, pulse-on time, pulse-off time, and power tubes, while the surface roughness was mainly affected by pulse type, pulse-on time, and power tubes.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Electrochemistry
Juchen Zhang, Shasha Song, Xinglin Li, Dengyong Wang, Weijie Chang, Junsheng Zhang, Huohong Tang, Haidong Yang, Shunhua Chen
Summary: The influence of preparation methods on the electrochemical dissolution behavior of Inconel 718 superalloy was investigated. The composition and structure of the passive film were determined, and it was found that the film mainly consisted of Cr2O3 and NiO. The preparation method affected the electrochemical and physical properties of the alloy's surface.
JOURNAL OF APPLIED ELECTROCHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
C. Li, S. H. Chen, Z. W. Wu, Z. F. Zhang, Y. C. Wu
Summary: This work develops novel WNbMoTaVZrx refractory high entropy alloys (RHEAs) and investigates their phase formation, microstructure, and mechanical properties. The WNbMoTaVZrx RHEAs show significantly improved strength and hardness, attributed to solid solution strengthening effect and severe lattice distortion caused by the Zr element. With increasing Zr content, the microstructure shifts from grain morphology to dendritic structures, and the formation of a second phase is observed. The study provides insights into the phase evolution, microstructure, and mechanical behavior of high entropy alloys.
JOURNAL OF MATERIALS RESEARCH
(2022)
Article
Nanoscience & Nanotechnology
D. X. Han, S. H. Chen, L. Zhao, X. Tong, K. C. Chan
Summary: In this study, three different hierarchical patterns were developed for kirigami metallic glass structures, and the degree of freedom reflecting the availability for morphing was identified as a key factor affecting their mechanical response. Structures with high hierarchical order and large degree of freedom exhibited high stretchability, highlighting the potential of multilevel architected structures as programmable units for stretchable mechanical metamaterials.
Article
Metallurgy & Metallurgical Engineering
Wu Xiao-feng, Wang Zhen-cheng, Cheng Ting, Wang Ke-yan, Xiang Jun, Zhao Rong-da, Chen Shun-hua, Wu Fu-fa
Summary: The addition of Cu and Er significantly reduced the grain size of the eutectic Mg2Si phase and modified the morphology of the beta-Al5FeSi phase in the hypoeutectic Al-10Mg(2)Si cast alloys. The strength and ductility of the alloys were improved simultaneously. The additions of Cu and Er prevented the heterogeneous nucleation of Mg2Si on AlP and inhibited the growth of the eutectic Mg2Si by forming Cu, Er, and P-containing phases.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2022)
Article
Automation & Control Systems
Shunhua Chen, Hewei Gu, Kangkang Feng, Hongmei Zheng, Ke Chen
Summary: This study investigates the machining performance of bulk metallic glass composites (BMGCs) through die-sinking electrical discharge machining (EDM) and compares it with conventional pure Zr. The study finds that the surface roughness and material removal rate of BMGCs are mainly affected by the peak current and pulse-on time. Additionally, the composite microstructure of BMGCs changes after EDM, and the carbonization effect can be reduced or eliminated by optimizing the processing parameters. Strategies for achieving better EDM performance of BMGCs are proposed.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
H. D. Yang, L. B. Zhang, J. S. Zhang, H. H. Tang, S. H. Chen
Summary: Understanding the effects of cooling rate and sample size on the plastic deformation behavior of metallic glasses is crucial. This study found that increasing the cooling rate significantly enhances the plasticity of metallic glasses, while decreasing the sample size only moderately improves the plasticity. The cooling rate has a greater influence on the plastic deformation behavior than the size effect, and the size effect is also dependent on the cooling rate.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
Guo-Ning Ji, Jun Xiang, Rong-Da Zhao, Fu-Fa Wu, Shun-Hua Chen
Summary: The microstructure and tensile properties of NixFeCoCrAl high-entropy alloys (HEAs) were investigated. The microstructure of the alloys can be adjusted from a single body-centered cubic (bcc) structure to a bcc/face-centered cubic (fcc) eutectic dual-phase structure by increasing the Ni content. The Ni1.71FeCoCrAl HEA achieved a high ultimate tensile strength of 1534 MPa with a bcc/fcc dual-phase structure, while the fcc NixFeCoCrAl HEAs with higher Ni content exhibited good ductility.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Guoning Ji, Jun Xiang, Jingsong Wei, Minghua Chen, Rongda Zhao, Xiaofeng Wu, Shunhua Chen, Fufa Wu
Summary: This study investigated the tensile plastic stability of Ti-based metallic glass composites (MGCs) with substrates of titanium alloys. The findings showed that the tensile plastic stability of MGC bimetals depended significantly on both the yield strength and geometrical dimension of the substrate. A high-strength Ti6Al4V (T64) alloy substrate greatly enhanced the ductility of the MGC, while combining the MGC with a low-strength pure titanium (PT) substrate led to worsened plastic stability. Increasing the thickness ratio of the PT substrate remarkably improved the plastic stability of the MGC. The enhancement of plasticity stability in the bimetals was explained and discussed from the perspective of normalized strain-hardening rate.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
H. H. Tang, L. Meng, J. S. Zhang, D. Zhou, S. H. Chen
Summary: Cellular bulk metallic glasses with varying porosities were fabricated by laser drilling, and their mechanical energy absorption process was studied. The results showed that the load drops followed a power-law scaling, and the Ep and L' values exhibited fractal nature. Fractal dimension, fractal character parameter, and fractal iteration sequence were used to characterize the serration evolution behavior.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
