A5012058044- Metamaterials and Metasurfaces Applications
- Terahertz technology and applications
- Advanced Antenna and Metasurface Technologies
- Plasmonic and Surface Plasmon Research
- Antenna Design and Analysis
- Superconducting and THz Device Technology
- Topological Materials and Phenomena
- Photonic and Optical Devices
- Millimeter-Wave Propagation and Modeling
- Vibration and Dynamic Analysis
- Adaptive Control of Nonlinear Systems
- Random lasers and scattering media
- Stability and Controllability of Differential Equations
- Orbital Angular Momentum in Optics
- Vehicle Noise and Vibration Control
- Acoustic Wave Phenomena Research
- Stability and Control of Uncertain Systems
- Microwave Engineering and Waveguides
- Meat and Animal Product Quality
- Magnetic and Electromagnetic Effects
- Proteins in Food Systems
Nankai University
2019-2024
Shenyang University
2017
Shenyang Normal University
2017
Nanjing University of Aeronautics and Astronautics
2017
In this work, the gyrotropic semiconductor InSb into twisted bilayer metasurface to form a magneto-optical moiré is introduced. Through theoretical analysis, "moiré angle" developed in which case nonreciprocity and chirality with spin-conjugate asymmetric transmission are obtained due simultaneous breaking of both time-reversal symmetry spatial mirror symmetry. The experiments confirm that can be actively manipulated by rotating angle external magnetic field, realizing transmission....
In this Letter, we propose a hybrid graphene-dielectric metasurface as bi-functional polarization converter. It can switch between reflective half-wave plate and quarter-wave around 1 THz by merely applying external biasing voltage, without reoptimizing the dielectric structure. Switching of two wave plates originates from distinct dispersion orthogonal eigenmodes with chemical potential, which is further explained overlapping graphene resonance modes. Compared graphene-metallic...
Abstract Accurate full‐parameter construction of the Jones matrix is great significance for encoding multiple functions in a single metasurface. Supercells composed several elements are used this purpose through coherent superposition. But all reported studies should be lossless with near‐unity transmission, which limits material system and restricts unitary manner. Here non‐unitary decomposition method proposed to build supercell using pair 0°‐oriented rods 45°‐oriented on‐demand design...
Abstract Active beam manipulation has significant potential in terahertz (THz) applications such as radar, wireless communication, and imaging, but they are still suffering from low efficiency tunability. Here, by combining the gyroelectric semiconductor InSb with anisotropic phase‐gradient metasurface, a nonreciprocal device actively controlled magnetic field is demonstrated experimentally. Due to diffractive angle‐frequency dependence, deflection waves dispersed ranging 35° 22.5° space...
We propose a tri-band half-wave plate in the reflection mode, composed of rectangular silicon bar arrays on 10-layer graphene substrate. By merely varying Fermi energy from 0 to 0.25 eV, three frequency bands shift step and merge continuous dynamic bandwidth 0.88 1.81 terahertz (THz). In addition, it can also dynamically switch reflected wave among cross-linear polarization, right-handed left-handed circular polarization 0.93-1.35 THz. found that large originates tunable phase layers. As no...
Abstract Magnetic Weyl semimetal shows intriguing properties in both fundamental physics and potential applications. However, the complex relationship between nonreciprocal transmission magnetic field manipulation systems has not been generally clarified fully utilized. Here, a universal Chirality–Wavevector–Magnetic ( C ‐ K B ) relation is established system, which completely describes spin topological band its intrinsic polarization output full space orientation under an arbitrary vector....
Dynamic beam scanning with a dynamically tunable number, direction, and polarization remains challenge in the terahertz gap, which is urgently needed for radar, next-generation wireless communication, imaging applications. Different from programmable metasurfaces element-level phase control, direction controlled by two cascaded all-dielectric during in-plane rotation. For pair of circularly polarized beams opposite handedness, field view (FOV) can be same or different according to...
Graphene under optical pump has been shown to be an attractive gain medium with negative dynamic conductivity at terahertz frequencies. However, the amplification over a monolayer graphene is very weak due its one-atom thickness. In this paper, proposed graphene-dielectric reflective metasurface effectively improved field localization and enhanced coherent amplification. The coefficient of 35 was obtained 3.38 THz room temperature infrared intensity 8 W/mm2. As increased from 0 15 W/mm2, we...
Wideband metasurfaces usually have increased structure complexity as compared to their narrowband counterparts, by integrating multiple in-plane or cascaded resonant structures. We propose a dielectric grating quarter-wave plate with alleviated and wide bandwidth at terahertz frequencies, simply enlarging the period from subwavelength superwavelength scale. From modal theory, supports more than one waveguide modes. The superposition of fundamental mode higher-order diverse dispersion...
Amplification of terahertz radiation is achieved by combining optically pumped graphene with a dielectric resonant cavity through numerical simulation. Graphene attached to one-dimensional grating and sandwiched between two distributed Bragg reflectors. The whole enhances the interaction wave while being transparent pump light. When femtosecond pulse light at 1.5 µm peak intensity <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD">...
The paper focused on the robust control problem of switched systems. systems contain actuator saturation, disturbance and state time-delay. First, to deal with saturation designed a nonlinear feedback controller. Then based multiple Lyapunov function method we obtained sufficient condition stability also estimated attraction domain system. Finally numerical example was given showing effectiveness paper's results.