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相关概念视频

Propagation of Waves01:07

Propagation of Waves

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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
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Travelling Waves01:04

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A wave is a disturbance that propagates from its source, repeating itself periodically, and is typically associated with simple harmonic motion. Mechanical waves are governed by Newton's laws and require a medium to travel. A medium is a substance in which a mechanical wave propagates, and the medium produces an elastic restoring force when it is deformed.
Water waves, sound waves, and seismic waves are some examples of mechanical waves. For water waves, the wave propagation medium is...
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Graphing the Wave Function01:13

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Consider the wave equation for a sinusoidal wave moving in the positive x-direction. The wave equation is a function of both position and time. From the wave equation, two different graphs can be plotted.
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Velocity and Acceleration of a Wave00:51

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A wave propagates through a medium with a constant speed, known as a wave velocity. It is different from the speed of the particles of the medium, which is not constant. In addition, the velocity of the medium is perpendicular to the velocity of the wave. The variable speed of the particles of the medium implies that there must be acceleration associated with it. 
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Equations of Wave Motion01:02

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Mathematically, the motion of a wave can be studied using a wavefunction. Consider a string oscillating up and down in simple harmonic motion, having a period T. The wave on the string is sinusoidal and is translated in the positive x-direction as time progresses. Sine is a function of the angle θ, oscillating between +A and −A and repeating every 2π radians. To construct a wave model, the ratio of the angle θ and the position x is considered.
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Propagation Speed of Electromagnetic Waves01:30

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Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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具有任意轨迹的时空光学波包.

Cen Wang, Zehong Liang, Zhang Ruan

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    此摘要是机器生成的。

    研究人员使用反向设计算法设计了可控制轨迹的时空光波包 (STWPs). 这种方法可以在复杂的系统中实现稳定的传播和速度控制.

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    科学领域:

    • 光学和光子学 在光学和光子学.
    • 波浪现象是一种波浪现象.
    • 非线性光学是非线性光学.

    背景情况:

    • 时空光波包 (STWPs) 提供对光传播的独特控制.
    • 目前用于控制STWP轨迹的现有方法是有限的,特别是在非抛动条件下.
    • 了解和操纵光物质相互作用对于先进的光学技术至关重要.

    研究的目的:

    • 开发一种反向设计算法,用于创建具有任意轨迹的STWP.
    • 为了能够精确控制STWP的纵向组速度.
    • 确保STWPs在自由空间和复杂介质中长距离稳定传播.

    主要方法:

    • 利用静止相近似理论用于反向设计.
    • 开发了一种与非状况兼容的算法.
    • 模拟和分析设计的STWP的传播动态.

    主要成果:

    • 成功设计了具有任意可变轨迹的STWP.
    • 证明了从负到超光的纵向组速度的连续控制.
    • 在长传播距离上观察到稳定的中心能量强度.
    • 证实了该算法与复杂的分散系统的兼容性.

    结论:

    • 拟议的反向设计算法为定制STWP传播提供了一个强大的工具.
    • 这种方法为需要在空间和时间上精确控制光线的应用程序开辟了新的可能性.
    • 控制STWP速度和轨迹的能力对光通信和成像具有重大影响.