概括
这项研究介绍了一种新的双层海根斯基因组.
科学领域:
- 物理 物理学 物理
- 材料科学 材料科学 材料科学
- 电气工程 电气工程
背景情况:
- 动态太赫兹 (THz) 相调节器对于波面调节至关重要,但典型的设计在相移方面面临局限性.
- 现有的调制器往往以低传输率为代价实现大相位移,阻碍了实际应用.
- 在宽带THz调制中实现高传输率和实质性相位转移仍然是一个重大挑战.
研究的目的:
- 提出和演示一种新的动态太赫兹相调节器.
- 通过实现高传输率和大相位移,克服传统相位调节器的局限性.
- 为了使先进的光学设备能够高效地操纵太赫兹波浪.
主要方法:
- 开发一种由位引入的双层惠根斯超表面 (HM).
- 瓦纳二氧化物 (VO2) 在地表结构中的整合.
- 在电流刺激下,在宽带频谱中进行相位移和传导的表征.
主要成果:
- 在0.64 THz时,达到281°的最大动态相位移,传输率超过50%.
- 在正常发生下,对于相位移超过180°的操作带宽为32.3%.
- 在10.4%的带宽 (0.64-0.71 THz) 上,同时实现了高相位移 (>180°) 和传输率 (>50%).
结论:
- 拟议的双层海根斯超表面有效平衡动态相位移和传导.
- 这种创新设计为高效的太赫兹波段操纵提供了一个有前途的解决方案.
- 该技术支持开发先进的太赫兹空间光调节器和全息投影仪.
相关概念视频
01:22Multi-input and Multi-variable systems
Cruise control systems in cars are designed as multi-input systems to maintain a driver's desired speed while compensating for external disturbances such as changes in terrain. The block diagram for a cruise control system typically includes two main inputs: the desired speed set by the driver and any external disturbances, such as the incline of the road. By adjusting the engine throttle, the system maintains the vehicle's speed as close to the desired value as possible.
In the absence of...
In the absence of...
01:26PD Controller: Design
In automotive engineering, car suspension systems often employ Proportional Derivative (PD) controllers to enhance performance. PD controllers are utilized to adjust the damping force in response to road conditions. A controller, acting as an amplifier with a constant gain, demonstrates proportional control, with output directly mirroring input.
Designing a continuous-data controller requires selecting and linking components like adders and integrators, which are fundamental in Proportional,...
Designing a continuous-data controller requires selecting and linking components like adders and integrators, which are fundamental in Proportional,...
01:30Control of Power Flow
There are several methods to control power flow in power systems:
01:21Generator Voltage Control
Generator voltage control is crucial for maintaining the stable operation of synchronous generators and wind turbines. In older models, a DC generator driven by the rotor delivers DC power to the rotor's field winding, and the power is transferred through slip rings and brushes. In the latest models, static or brushless exciters are used. Static exciters rectify AC power from the generator terminals and then transfer the DC power directly to the rotor. Brushless exciters, on the other hand, use...
01:17Turbine-Governor Control
Turbine-governor control is crucial for maintaining power system stability by balancing turbine mechanical power output with electrical load demand. This mechanism ensures that generator frequency and rotor speed are within acceptable limits during load variations. Turbine-generator units store kinetic energy due to their rotating masses; this energy is released to meet the load requirement when the load increases. The electrical torque of turbines rises to meet the demand, whereas the...
01:28Load-frequency control
Load-frequency control (LFC) is vital for maintaining power system stability, ensuring that frequency and power flows remain within acceptable limits during load changes. Turbine-governor control eliminates rotor accelerations and decelerations following load changes. However, a steady-state frequency error persists when the change in the turbine-governor reference setting is zero. In an interconnected power system, each area agrees to export or import a scheduled amount of power through...