A5053419501- Diamond and Carbon-based Materials Research
- Advanced Fiber Laser Technologies
- Semiconductor Quantum Structures and Devices
- High-pressure geophysics and materials
- Metal and Thin Film Mechanics
- Photonic and Optical Devices
- GaN-based semiconductor devices and materials
- Advanced Materials Characterization Techniques
- Traumatic Brain Injury and Neurovascular Disturbances
- Advanced materials and composites
- Laser-Ablation Synthesis of Nanoparticles
- Ion-surface interactions and analysis
- S100 Proteins and Annexins
- Indoor and Outdoor Localization Technologies
- Nonlinear Optical Materials Studies
- Laser-Matter Interactions and Applications
- Force Microscopy Techniques and Applications
- Laser Material Processing Techniques
- Underwater Vehicles and Communication Systems
- Hyperglycemia and glycemic control in critically ill and hospitalized patients
- Speech and Audio Processing
- Metallurgy and Material Forming
- Industrial Technology and Control Systems
- Semiconductor materials and devices
- Nanowire Synthesis and Applications
Cardiff University
2023-2025
Nanjing University of Posts and Telecommunications
2022
University of Science and Technology Beijing
2018-2020
Tianneng Power (China)
2015
Ensemble negatively charged nitrogen-vacancy centers in diamond are promising quantum sensors. To optimize their sensitivity, it is crucial to increase the number of spins sampled and maximize coupling detection system without degrading spin properties. In this paper, we demonstrate enhanced magnetometry via a buried laser-written waveguide with 4.5 ppm centers. The waveguide-coupled exhibit coherence properties comparable those pristine diamond. Waveguide-enhanced magnetic field sensing...
Quantum emitters, such as the negatively charged nitrogen-vacancy center in diamond, are attractive for quantum technologies nano-sensing, information processing, and a non-classical light source. However, it is still challenging to position individual emitters photonic structures whilst preserving spin coherence properties of defect. In this paper, we investigate single ensemble waveguide-integrated centers diamond fabricated by femtosecond laser writing followed thermal annealing. Their...
An ensemble of negatively charged nitrogen-vacancy centers in diamond can act as a precise quantum sensor even under ambient conditions. In particular, to optimize thier sensitivity, it is crucial increase the number spins sampled and maximize their coupling detection system, without degrading spin properties. this paper, we demonstrate enhanced magnetometry via high-quality buried laser-written waveguide with 4.5 ppm density centers. We show that waveguide-coupled exhibit comparable...
Aluminum nitride is a technologically important wide band-gap semiconductor which has been shown to host bright quantum emitters. We use photon emission correlation spectroscopy (PECS), time-resolved photoluminescence (TRPL), and state-population dynamic simulations probe the dynamics of under continuous wave (CW) pulsed optical excitation. infer that there are at least four dark shelving states, govern TRPL, bunching, saturation transition. study in detail two emitters (QEs) with differing...
Laser-written optical waveguides in diamonds are a key technology to enhance coupling between defect centers and light, boosting applications nanoscale sensing quantum information processing. However, laser writing of photonic structures produces strain the diamond lattice, modifying properties poorly understood ways. This study demonstrates that optically detected magnetic resonance spectroscopy provides sufficient fully characterize spatial distribution such device, even without constant...
The negatively charged nitrogen-vacancy (NV${}^-$) center in diamond has shown great potential nanoscale sensing and quantum information processing due to its rich spin physics. An efficient coupling with light, providing strong luminescence, is crucial for realizing these applications. Laser-written waveguides promote NV${}^-$ creation improve their light but at the same time induce strain crystal. induced contributes guiding also affects energy levels of centers. We probe states...
Abstract Single‐crystal diamonds are successfully synthesized using microwave plasma chemical vapor deposition. A smooth and flat single‐crystal surface is obtained by optimizing the size relationship between seed substrate square hole of shielding ring. When sample grows higher than polycrystalline diamond on molybdenum holder, becomes uneven. The polarization characteristics two kinds deposition (CVD) layers compared uneven surfaces. Abnormal high‐order birefringence occurs in both...
Quantum emitters, such as the negatively charged nitrogen-vacancy center in diamond, are attractive for quantum technologies, nano-sensing, information processing, and a non-classical light source. However, it is still challenging to position individual emitters photonic structures while preserving spin coherence properties of defect. In this paper, we investigate single ensemble waveguide-integrated centers diamond fabricated by femtosecond laser writing followed thermal annealing. Their...
Red colour centres in AlN are bright room-temperature quantum light sources emitting anti-bunched under optical excitation. We study the temporal, spectral and polarisation behaviour of emitters commercially supplied on sapphire. The high refractive index limits photon collection efficiency for a lens above sample, through refraction total internal reflection. Applying macroscopic solid immersion which is almost matched to semiconductor we achieve 4.2-fold increase efficiency, yielding...
With the increasing requirements of wireless sensing technology, device-free based technique has received much attentions. In this paper, channel state information (CSI) obtained from Wi-Fi signal is proposed for localization and identification using multi-task learning deep residual shrinkage network (DRSN). First, Hampel filter wavelet are used to remove outliers mitigate noise, respectively. Then, hard parameter sharing framework recognition training. Specially, DRSN feature extraction in...
SVC is a world-recognized mature and effective dynamic reactive power compensation technology, has been used widely in the world.Through efforts for more than decade, Chinese manufacturers have mastered complete own independent intellectual properties, exported products to Vietnam, Malaysia, India, Brazil other countries successively.In fact, most overseas customers of are still developing countries, due weak grid architecture, relatively backward overall technical level, overcome many...
The possibility to develop room-temperature quantum sensors by focusing ultrashort laser pulses inside the bulk of diamond is introduced. A systematic study fabrication parameters presented, leading enhanced sensitivity sensing devices in diamond.
Aluminum nitride is a technologically important wide bandgap semiconductor which has been shown to host bright quantum emitters. In this paper, we probe the photodynamics of emitters in aluminum using photon emission correlations and time-resolved spectroscopy. We identify that each emitter contains as many 6 internal energy levels with distinct laser power-dependent behaviors. Power-dependent shelving de-shelving processes, such optically induced ionization recombination are considered,...