A5103126667- Photorefractive and Nonlinear Optics
- Photonic and Optical Devices
- Metamaterials and Metasurfaces Applications
- Advanced Fiber Laser Technologies
- Photonic Crystals and Applications
- Topological Materials and Phenomena
- Numerical methods in engineering
- Nuclear Materials and Properties
- Organic Light-Emitting Diodes Research
- Geotechnical Engineering and Underground Structures
- Luminescence and Fluorescent Materials
- Ultrasonics and Acoustic Wave Propagation
- Nuclear Engineering Thermal-Hydraulics
- Nuclear reactor physics and engineering
- Solid State Laser Technologies
- Organic Electronics and Photovoltaics
Nankai University
2023-2024
Harbin Engineering University
2023
Taiyuan University of Technology
2021
Ultracompact devices for second harmonic generation (SHG) have broad applications in various fields. In this study, we numerically demonstrate efficient SHG from a merged bound state the continuum (BIC) based on lithium niobate (LN) freestanding metasurface. Such BIC efficiently reduces radiative loss and strongly enhances quality factor (Q factor). We achieved 1% conversion efficiency under ${5}^{\ensuremath{\circ}}$ incident angle with 2 $\mathrm{kW}/{\mathrm{cm}}^{2}$ input intensity,...
Abstract This study presents photonic vertical cavities consisting of nonlinear materials embedded in crystals (PhCs) for resonantly enhancing second harmonic generation (SHG). Previous attempts at SHG such structures have been limited to efficiencies 10 −7 −5 , but a high efficiency 0.28% by constructing cavity with lithium niobate membrane placed between two PhCs is demonstrated, which exhibits high‐quality resonances. The results open up new possibilities compact laser frequency...
Abstract Despite various successes in lithium niobate (LN) integrated photonic devices (e.g., light sources, waveguides, modulators, etc.), LN photodetectors (PD) that converts into electrical signals have received less research attention. Here, fast PDs are demonstrated. Defect energy states used within the forbidden band of as electron donor centers to generate free carriers conduction under optical excitation visible range. Compared with previous pyroelectric whose response speeds...
Lithium niobate (LiNbO3, LN) on insulator (LNOI) has emerged as a promising platform for integrated photonics, due to the strong optical confinement and excellent nonlinear electrical characteristics of LN crystal. Focused ion beam (FIB) versatile technique become typical way fabricate LNOI microstructures. However, bombardment Ga+ ions during fabrication, lattice is damaged, which would deteriorate performance devices. Thus, recognition damage formed by FIB fabrication necessary control...
Electro-optically (EO) tunable metasurfaces have received considerable attention owing to their capability for dynamic light field control. Here, we report an EO lithium niobate metasurface mediated by topological corner states. Such a supercell of is constructed two kinds finite-sized arrays possessing different properties via the generalized two-dimensional (2D) Su–Schrieffer–Heeger model. The generated narrow-linewidth resonance with high-quality factor and strong localization are very...
In this paper, the complex function method, Green's method and coordinate transformation are used to solve scattering problem of cavity with arbitrary shape crack at position in orthotropic elastic half-space under incidence SH waves. Firstly, displacement field stress caused by action incident wave obtained. Secondly, solution is derived when plane line source load acts on cavity. Then, constructed based ‘cutting.’ The total can be further analytical solutions dynamic concentration factor...
Compared with conservation evaluation model, best estimate plus uncertainty (BEPU) method can obtain more realistic results and gain larger license margins respect to the safety criteria. In view of this, a BEPU named 4S (SNERDI Statistical Solution for Safety) has been developed, according basic principles model development assessment RG 1.203. The characteristics are as follows: output is quantified by using random sampling propagation input uncertainties. Global sensitivity analysis used...