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Related Concept Videos

Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

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Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
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The provided content explores the behavior of traveling waves on single-phase lossless transmission lines. It begins with a single-phase two-wire lossless transmission line of length Δx, characterized by a loop inductance LH/m and a line-to-line capacitance C F/m. These parameters result in a series inductance LΔx  and a shunt capacitance CΔx.
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When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Reference-less wavefront shaping in a Hopfield-like rough intensity landscape.

Marco Leonetti, Luca Leuzzi, Giancarlo Ruocco

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    We developed a new wavefront shaping technique to measure light coupling in disordered media. Our Complete Couplings Mapping method overcomes optimization issues, achieving maximum light focusing intensity.

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    Area of Science:

    • Wavefront shaping
    • Disordered media optics
    • Light propagation

    Background:

    • Measuring light coupling in disordered media is challenging.
    • Sequential wavefront optimization can get stuck in suboptimal states.
    • Existing methods lack a reference beam for full matrix measurement.

    Purpose of the Study:

    • Introduce a novel digital-micromirror based binary-phase wavefront shaping technique.
    • Enable measurement of the full coupling matrix without a reference.
    • Achieve optimal light focusing through disordered media.

    Main Methods:

    • Digital-micromirror device for binary-phase wavefront shaping.
    • Complete Couplings Mapping (CCM) method.
    • Analysis of the bi-dyadic structure of the coupling matrix.

    Main Results:

    • Successfully measured the full coupling matrix of a disordered medium.
    • Overcame intensity landscape roughness issues in optimization.
    • Consistently achieved theoretically expected maximum transmitted light intensity.

    Conclusions:

    • The proposed technique and CCM method effectively address limitations in wavefront shaping.
    • Enables precise control and focusing of light through complex media.
    • Paves the way for advanced applications in optics and photonics.