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Related Concept Videos

Interference and Superposition of Waves01:07

Interference and Superposition of Waves

6.2K
When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
6.2K
Interference and Diffraction02:18

Interference and Diffraction

51.3K
Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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Interference: Path Lengths01:10

Interference: Path Lengths

1.8K
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...
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Sound Waves: Interference00:53

Sound Waves: Interference

4.4K
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...
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¹H NMR Signal Multiplicity: Splitting Patterns01:13

¹H NMR Signal Multiplicity: Splitting Patterns

6.4K
When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
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IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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Related Experiment Videos

Non-Hermitian multimode interference.

Stefano Longhi, Liang Feng

    Optics Letters
    |April 3, 2020
    PubMed
    Summary
    This summary is machine-generated.

    Multimode interference (MMI) in non-Hermitian optical systems exhibits unique behaviors like absent mirror images. This sensitivity offers new possibilities for advanced optical sensing applications.

    Related Experiment Videos

    Area of Science:

    • Diffractive optics
    • Non-Hermitian photonics

    Background:

    • Multimode interference (MMI) and self-imaging are key diffractive optics phenomena.
    • Typically studied in lossless dielectric waveguides, their behavior in systems with gain and loss is less understood.
    • Optical gain and loss break mode orthogonality and symmetries, potentially altering MMI.

    Purpose of the Study:

    • To investigate multimode interference (MMI) in non-Hermitian optical systems.
    • To explore the impact of spatial gain and loss on self-imaging phenomena.
    • To identify unique MMI characteristics in non-Hermitian waveguides.

    Main Methods:

    • Analysis of MMI in non-Hermitian graded-index waveguide structures.
    • Examination of MMI in non-Hermitian coupled optical waveguide structures.
    • Theoretical consideration of mode interference under non-Hermitian conditions.

    Main Results:

    • MMI in non-Hermitian systems shows distinct features compared to lossless counterparts.
    • Absence of mirror images is observed in these non-Hermitian MMI scenarios.
    • Self-imaging demonstrates strong sensitivity to perturbations in non-Hermitian waveguides.

    Conclusions:

    • MMI in non-Hermitian optical systems presents novel phenomena.
    • The observed absence of mirror images and high sensitivity to perturbations are significant findings.
    • Non-Hermitian MMI in waveguides holds promise for enhanced optical sensing applications.