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Phase-lead and Phase-lag Controllers01:22

Phase-lead and Phase-lag Controllers

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Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass...
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Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

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Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
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Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

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Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
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Phase Diagrams02:39

Phase Diagrams

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A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
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Phase Transitions

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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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Launching phase-controlled surface plasmons on Babinet metasurfaces.

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    Researchers developed a metasurface to control surface plasmons, enabling precise manipulation of light at metal-dielectric interfaces for advanced photonics and plasmonics applications.

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    Area of Science:

    • Photonics and Plasmonics
    • Electromagnetism
    • Materials Science

    Background:

    • Surface plasmons are electromagnetic modes confined to metal-dielectric interfaces.
    • These modes offer strong field enhancement, crucial for various photonic and plasmonic applications.
    • Precise control over surface plasmons is essential for advancing modern optical technologies.

    Purpose of the Study:

    • To propose and demonstrate a metasurface for launching surface plasmons with controlled phase.
    • To utilize the Babinet principle for achieving phase control in surface plasmon launching.
    • To enable anomalous (directional, focusing, diverging) launching and wavefront manipulation of surface plasmons.

    Main Methods:

    • Design of a metasurface composed of C-shaped apertures on a metal surface.
    • Leveraging electric dipole resonance within the aperture resonators.
    • Spatial arrangement and orientation of aperture resonators to achieve arbitrary phase profiles.

    Main Results:

    • Demonstration of a metasurface capable of launching surface plasmons with tailored phase profiles.
    • Successful implementation of phase control based on the Babinet principle.
    • Achieved anomalous surface plasmon launching, including directional control and focusing/diverging capabilities.

    Conclusions:

    • The proposed metasurface offers a novel method for controlling surface plasmons.
    • This technology enables precise manipulation of surface plasmon wavefronts for advanced applications.
    • The findings contribute to the development of next-generation photonic and plasmonic devices.