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Related Concept Videos

Interference: Path Lengths01:10

Interference: Path Lengths

Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
Mesh Analysis for AC Circuits01:12

Mesh Analysis for AC Circuits

In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...
Transmission Line Design Considerations01:23

Transmission Line Design Considerations

Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

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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Sound Waves: Interference00:53

Sound Waves: Interference

Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
Propagation of Waves01:07

Propagation of Waves

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.
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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
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Elimination of cross talk in waveguide intersections.

S G Johnson, C Manolatou, S Fan

    Optics Letters
    |December 20, 2007
    PubMed
    Summary

    We developed criteria for perpendicular waveguide crossings with near-perfect light transmission and zero crosstalk. This breakthrough applies to nanoscale waveguides and significantly reduces signal interference.

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    Area of Science:

    • Photonics
    • Optical Engineering
    • Waveguide Technology

    Background:

    • Waveguide crossings are essential components in integrated photonic circuits.
    • Minimizing crosstalk and maximizing throughput at crossings is a persistent challenge, especially for subwavelength structures.

    Purpose of the Study:

    • To establish general criteria for designing perpendicular waveguide crossings with high throughput and negligible crosstalk.
    • To demonstrate the applicability of these criteria to nanoscale waveguides, where dimensions approach the wavelength of light.

    Main Methods:

    • Theoretical analysis based on symmetry considerations and resonant tunneling.
    • Numerical simulations of waveguide crossings in both 2D photonic crystals and high-index-contrast waveguides.

    Main Results:

    • Achieved nearly 100% throughput and 0% crosstalk in waveguide crossings.
    • Demonstrated effective crosstalk reduction by up to 8 orders of magnitude compared to conventional designs.
    • Validated the design criteria for waveguides with widths on the order of the wavelength.

    Conclusions:

    • The proposed criteria enable highly efficient and crosstalk-free waveguide crossings.
    • The findings are applicable to various waveguide platforms, including photonic crystals and high-index-contrast structures.
    • This work offers a significant advancement for integrated photonic device performance and miniaturization.