A5112616358- Advanced Fiber Optic Sensors
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Semiconductor Lasers and Optical Devices
- Analytical Chemistry and Sensors
- Advanced Photonic Communication Systems
- Optical Network Technologies
- Optical Wireless Communication Technologies
- Photonic Crystal and Fiber Optics
- Spectroscopy and Chemometric Analyses
- Topological Materials and Phenomena
- Spectroscopy Techniques in Biomedical and Chemical Research
- Advanced Optical Sensing Technologies
- Nanowire Synthesis and Applications
- Plasmonic and Surface Plasmon Research
- Photonic Crystals and Applications
- Simulation and Modeling Applications
- Force Microscopy Techniques and Applications
- GaN-based semiconductor devices and materials
- Geological Modeling and Analysis
- Semiconductor Quantum Structures and Devices
- Mechanical and Optical Resonators
- Optical Coatings and Gratings
- Traffic control and management
- Complex Network Analysis Techniques
Guangxi Normal University
2016-2025
Fudan University
2021-2024
Peng Cheng Laboratory
2022-2024
Shanghai Jiao Tong University
2024
Institute of Economics
2022
Hong Kong Polytechnic University
2021
Nanjing University
2012-2013
Chengdu University of Technology
2013
We demonstrate that multiple higher-order topological transitions can be triggered via the continuous change of geometry in kagome photonic crystals composed three dielectric rods. By tuning a single parameter, corner and edge states emerge or disappear with transitions. Two distinct insulator phases normal phase are revealed. Their indices obtained from symmetry representations. A analog fractional charge is introduced to distinguish two phases. Our predictions readily realized verified...
The recent advancements in higher-order topology have provided unprecedented opportunities optical device designs and applications. Here, we propose a new, to the best of our knowledge, method realize rainbow trapping based on topological corner modes (HOTCMs), which are constructed by two configurations breathing kagome photonic crystals with distinct phases. Interestingly, HOTCMs localized at corners different geometric found be frequency dispersive thus initiate possible application...
Visible light communication (VLC) based on laser diodes demonstrates great potential for high data rate maritime, terrestrial, and aerial wireless links. Here, we design fabricate high-speed blue (LDs) grown c -plane gallium nitride (GaN) substrate. This was achieved through active region miniaturization toward a narrow ridge waveguide, short cavity length, single longitudinal mode Fabry–Perot diode. The fabricated mini-LD has low threshold current of 31 mA slope efficiency 1.02 W/A. A...
We propose and experimentally demonstrate a novel interference fading suppression method for phase-sensitive optical time domain reflectometry (φ-OTDR) using space-division multiplexed (SDM) pulse probes in few-mode fiber. The SDM consist of multiple different modes, three spatial modes (LP01, LP11a, LP11b) are used this work the proof concept. Firstly, Rayleigh backscattering light is characterized, it turns out that waveforms φ-OTDR traces distinct all independent. Thanks to difference...
To achieve real-time and rapid monitoring of quality changes in flaxseed oil during frying, we designed three types experiments including variations frying temperatures, times, durations. Raman spectra two physicochemical indicators the samples were acquired. The was analysed by combining spectral intensity, peak intensity ratio, area ratio. results peak-area-ratio method showed that acid value is related to characteristic areas at 1022 cm−1 1745 experiments. peroxide ratio S1078/S970...
A cost-efficient P-D fiber structure-based Sagnac loop sensor is proposed and experimentally demonstrated for measuring temperature liquid refractive index (RI). The structure fabricated by fusion splicing a section of polarization-maintaining (PMF) to piece multimode D-shaped optical (MMDF). Then the built into using 3dB coupler. RI characteristics are investigated experimentally. results show that two resonant dips have different spectral responses RI, which indicate can realize...
We systematically study the first- and second-order band topologies, which are tied to pseudospin valley degree of freedoms (DOFs), in honeycomb-kagome photonic crystals (HKPCs). first demonstrate quantum spin Hall phase as first-order pseudospin-induced topology HKPCs by observing partial pseudospin-momentum locked edge states. By employing topological crystalline index, we also discover multiple corner states emerging hexagon-shaped supercell manifestation HKPCs. Next, gapping Dirac...
Abstract In classical optical time domain reflectometries (OTDRs), for sensing an 200-km-long fiber, the pulses launched are as wide tens of microseconds to get enough signal-to-noise ratio, while it results in a two-point resolution kilometers. To both reach long distance and sub-kilometer resolution, we demonstrated long-haul photon-counting OTDR using superconducting nanowire single-photon detector. 40-minute-long measurement, obtained dynamic range 46.9 dB, corresponding maximum 246.8...
The development of optical fiber technology has facilitated the technological innovation in communication and sensing systems over past decades. Among all technologies, distributed (DOFS) attracted great research interests been extensively investigated. In systems, parameters such as intensity, phase, polarization, or frequency are modulated to realize data transmission, while for DOFS they employed measure physical parameter variation along fiber. Due similarities shared by techniques,...
A vector magnetic field sensor based on a ferrofluid-encapsulated coreless D-shaped fiber is proposed and demonstrated. The core of the singlemode (SMF) completely removed by polishing technology, remaining part transformed into multimode interference (MMI) waveguide. exposed side-polishing plane enable evanescent to interact with surrounding fluid (MF). Relying non-circularly symmetric geometry MF refractive index modulation orientation intensity applied field, sensing achieved. response...
Recent advances in topological photonics provide unprecedented opportunities to realize a photonic cavity. A recent work shows that the electromagnetic wave can be effectively trapped via shifted crystal interfaces (SPCIs), which offers an alternative approach realizing Here, we proposed one-dimensional insulators based on SPCIs-induced cavity chain, is analogous Su–Schrieffer–Hegger model and compatible with silicon-on-insulator platform. Owing asymmetry feature of cavities, chains either...
Generally, the responsivities of hot-electron photodetectors (HE PDs) are mainly dependent on device working wavelengths. Therefore, a common approach to altering is change Another strategy for manipulating electrical performances HE PDs harness electric bias that can be used regulate harvesting at specified However, reliance hampers flexibility in operations. In this study, we propose purely planar design contains phase-change material Sb2S3, realizing reversibly alterable photodetection...
Abstract Planar, broadband, and tunable hot-electron photodetection with chromium-involved Tamm plasmons
A novel photon-counting optical time-domain reflectometry (ν-OTDR) based on superconducting nanowire single-photon detector (SNSPD) is proposed and demonstrated experimentally. Benefiting from the low noise equivalent power (NEP), high repetition rate timing jitter of SNSPD, our ν-OTDR system achieves a dynamic range 22 dB after measurement time 15 minutes. This obtainable corresponds to sensing length 110 km. The exhibits 6.0 cm spatial resolution at end 2 km 1.1 m 26 standard single-mode...
A high-sensitivity all-fiber temperature sensor based on a Sagnac interferometer is demonstrated by splicing section of polarization maintaining fiber (PMF) between two sections standard single mode fibers (SMFs). In this sensor, the SMF-PMF-SMF structure in loop bent into circle to enhance sensitivity. The length and curvature PMF are investigated can be optimized further increase sensitivity sensor. Results show that radius has an important effect upon due bend-induced birefringence...
Early diagnosis is important to reduce the incidence and mortality rate of diabetes. The feasibility early diabetes was studied via near-infrared spectra (NIRS) combined with a support vector machine (SVM) aquaphotomics. Firstly, NIRS entire blood samples from population healthy, pre-diabetic, diabetic patients were obtained. spectral data in visible region (400–2,500 nm) used as research object qualitative analysis. Secondly, several preprocessing steps including multiple scattering...