A5059607833- Advanced Antenna and Metasurface Technologies
- Microwave Engineering and Waveguides
- Nonlinear Photonic Systems
- Acoustic Wave Phenomena Research
- Metamaterials and Metasurfaces Applications
- Antenna Design and Optimization
- Structural Analysis and Optimization
South China Normal University
2022-2024
Reciprocity is a fundamental principle of wave physics related to time-reversal symmetry. Nonreciprocal behaviors have been pursued for decades because their great scientific significance and tremendous potential applications. However, nonreciprocity devices based on manipulation non-topological charge (TC) in most studies date. Here, we introduce the rotational Doppler effect (RDE) into acoustic system achieve nonreciprocal control TC beam. We use metasurface generate vortex beam with...
Hollow beam is a peculiar structure beam, which has been widely used in various areas. Here, we propose novel diffraction optical element to generate tunable hollow beams. This composed of periodic concentric rings. The phase each ring periodically distributed between −π and π satisfies complex variable function. By tuning the parameters structure, can flexibly manipulate size length beam. be increased from 98 λ 248 λ, full width at half maximum varies 0.43 0.61 λ. Moreover, light intensity...
We propose a novel diffraction optical element to generate tunable hollow beams. This is composed of periodic concentric rings, where the intensity bright on ring and dark outside ring. The phase each periodically distributed between -π π satisfies complex variable function. A highly beam can be obtained by focusing an angularly polarized light, as demonstrated simulations. By tuning parameters structure, we flexibly manipulate size length beam. increased from 80λ 280λ, full width at half...