This is our latest selection of worldwide publications and patents in english on Optics, between many scientific online journals, classified and focused on optics, diffraction, optical resolution, polarisation, laser, Kapitsa–Dirac, optical instrument and photon.
Distributed displacement sensing phase demodulation method and apparatus, and device
Patent published on the 2025-06-12 in WO under Ref WO2025118713 by BGP INC CHINA NAT PETROLEUM CORPORATION [CN] (Li Yanpeng [cn], Zhang Shaohua [cn])
Abstract: A distributed displacement sensing phase demodulation method, comprising: determining an IQ demodulation initial phase and an IQ signal amplitude on the basis of an IQ signal (S101); performing a phase decoupling operation on the IQ demodulation initial phase, and sequentially subtracting from the IQ demodulation initial phase an initial phase of an optical fiber sensing signal sensing position, an initial phase of a laser pulse source and an accumulated phase along paths in a transmission proce[...]
Our summary: Distributed displacement sensing phase demodulation method, including determining IQ demodulation initial phase and signal amplitude, performing phase decoupling operation, unwinding processing, calculating displacement sensing data, eliminating coherent fading noise, and transposing data for final phase-demodulated displacement sensing data.
phase demodulation, displacement sensing, coherent fading, IQ demodulation
Patent
Oxide and Hydrogel Inverse Opals and Their Applications as Physical, Chemical and Biological Sensors
Published on 2025-05-27 by Peter Hutchison, Peter Kingshott, Aimin Yu @MDPI
Abstract: Inverse opal (IO) structures based on photonic colloidal crystal (PCC) templates are types of materials that possess unique optical properties due to their ordered arrays. These materials have the ability to manipulate the propagation of light, producing unique reflection spectra and structural colours. Due to these properties, IOs have been used as optical sensors for various applications such as the detection of physical, chemical, and biological entities. This review begins with a brief intro[...]
Our summary: Oxide and Hydrogel Inverse Opals are materials with unique optical properties that manipulate light propagation, used for sensing physical, chemical, and biological entities. Strategies to enhance sensitivity and address current challenges in IO-based sensors are also discussed.
inverse opals, photonic colloidal crystal, optical sensors, biological sensors
Publication
Compact Nonvolatile Reconfigurable Mode Converter by Sb2S3 Embedded in 4H-Silicon-Carbide-on-Insulator Platform
Published on 2025-05-01 by Danfeng Zhu, Junbo Chen, Shaobin Qiu, Dingnan Deng, Jinming Luo @MDPI
Abstract: Nonvolatile switching is emerging and shows potential in integrated optics. A compact nonvolatile reconfigurable mode converter implemented on a 4H-silicon-carbide-on-insulator (4H-SiCOI) platform with a footprint of 0.5 × 1 × 1.8 μm3 is proposed in this study. The functional region features an Sb2S3 film embedded in a 4H-SiC strip waveguide. The functionality is achieved through manipulating the phase state of the Sb2S3. The high refractive index contrast [...]
Our summary: Compact nonvolatile reconfigurable mode converter implemented on a 4H-SiCOI platform with high efficiency mode conversion. Functional region features Sb2S3 film embedded in 4H-SiC strip waveguide, achieving high transmittance and mode purity. Device exhibits robustness and potential for large communication capacity in neuromorphic optical computing.
Nonvolatile, Reconfigurable, Mode Converter, 4H-Silicon-Carbide-on-Insulator
Publication
Ternary Heterojunction Synaptic Transistors Based on Perovskite Quantum Dots
Published on 2025-05-01 by Shuqiong Lan, Jinkui Si, Wangying Xu, Lan Yang, Jierui Lin, Chen Wu @MDPI
Abstract: The traditional von Neumann architecture encounters significant limitations in computational efficiency and energy consumption, driving the development of neuromorphic devices. The optoelectronic synaptic device serves as a fundamental hardware foundation for the realization of neuromorphic computing and plays a pivotal role in the development of neuromorphic chips. This study develops a ternary heterojunction synaptic transistor based on perovskite quantum dots to tackle the critical challenge [...]
Our summary: Development of ternary heterojunction synaptic transistor based on perovskite quantum dots for synaptic weight modulation. Enhanced hysteresis window and effective carrier trapping modulation. Emulation of photonic synaptic behaviors for high-performance optoelectronic synaptic transistors.
Perovskite Quantum Dots, Ternary Heterojunction, Synaptic Transistors, Neuromorphic Computing
Publication
A Mechanism of Argon Arc Remelting of LPBF 18Ni300 Steel Surfaces
Published on 2025-04-18 by Xiaoping Zeng, Yehui Sun, Hong Zhang, Zhi Jia, Quan Kang @MDPI
Abstract: This study aims to reduce pores, cracks, and other defects on the surface of laser powder bed fusion (LPBF)-fabricated 18Ni300 steel and improve its surface quality. Remelting was carried out on the surface with an argon arc as the heat source. Then, the surface layer was characterized using SEM, EDS, XRD, EBSD, and hardness testing. The results showed the following: When the pulse current I increased from 16 A to 20 A, the surface hardness of LPBF 18Ni300 increased due to a decrease in defects [...]
Our summary: This study investigates the mechanism of argon arc remelting on the surfaces of LPBF 18Ni300 steel to improve surface quality and hardness. Results show that increasing pulse current enhances surface hardness by reducing defects and increasing martensite phase, while excessive current can introduce new defects and decrease hardness. Factors affecting hardness include pore weakening, phase transformation strengthening, grain refinement strengthening, and texture strengthening.
argon arc remelting, LPBF 18Ni300 steel, surface quality, hardness testing
Publication
Microstructure Evolution During Preparation of Semi-Solid Billet for 7075 Aluminum Alloy by EASSIT Process
Published on 2025-04-17 by Yanghu Hu, Ming Chang, Shuqin Fan, Boyang Liu, Yongfei Wang, Shuangjiang Li, Chao Zhang, Peng Zhang, Shengdun Zhao @MDPI
Abstract: The 7075 aluminum alloy semi-solid billet is prepared using the extrusion alloy semi-solid isothermal treatment (EASSIT) process. These findings indicate that as the isothermal time increases, there is a noticeable increase in both the average grain size (AGS) and shape factor (SF). The relationship between the AGS, SF, and isothermal temperature is complex due to the influence of grain refinement mechanisms. The HV0.2 of isothermal samples decreased with the increase in isothermal temperature, [...]
Our summary: The study investigates the microstructure evolution of 7075 aluminum alloy semi-solid billet prepared by the EASSIT process. Increasing isothermal time leads to larger average grain size and shape factor. Cu and Si segregation affects the coarsening behavior at high temperatures.
Microstructure Evolution, Semi-Solid Billet, EASSIT Process, Grain Refinement
Publication
Effect of Partial Fibre Laser Processing on the Wear Resistance of NiCrMoFeCSiB Coatings
Published on 2025-03-11 by Olegas ?erna�?jus, Jelena �kamat, ?ukasz Gierz, Olga Zharkevich, Alexandra Berg @MDPI
Abstract: Surface laser processing of metallic materials is known to be effective in improving wear resistance due to microstructure refinement and the associated hardening effect. However, the formation of cracks, which frequently accompanies such processing, remains a challenge. This work focusses on partial laser processing of Ni-based protective coatings as a method that could potentially reduce the risk of crack formation due to lower overall heat input and retaining softer material portions that fac[...]
Our summary: Effect of Partial Fibre Laser Processing on Wear Resistance of NiCrMoFeCSiB Coatings. Laser processing of Ni-based coatings improves wear resistance by refining microstructure and hardening material. Partial laser treatment reduces crack formation risk and enhances wear resistance significantly.
laser processing, wear resistance, Ni-based coatings, crack formation
Publication
Light valve system with gap maintenance system
Patent published on the 2025-03-06 in WO under Ref WO2025049744 by SEURAT TECH INC [US] (Elhadj Selim [us], Sargolzaeiaval Yasaman [us], Davidson Zoey [us])
Abstract: A light valve can include a liquid crystal layer having a first and a second side. A first substrate is positioned in contact with the first side of the liquid crystal layer, with the first substrate having a first semiconductor layer. A second substrate is positioned in contact with the second side of the liquid crystal layer, with the second substrate having a second semiconductor transparent electrode layer and a second semiconductor layer. A plurality of laser transparent aperture support st[...]
Our summary: Light valve system with gap maintenance system, includes liquid crystal layer with first and second sides, substrates with semiconductor layers, and laser transparent aperture support structures for stable uniform gap.
light valve system, gap maintenance system, liquid crystal layer, semiconductor layer
Patent
