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Propagation of Waves01:07

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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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Modulation instability in waveguides doped with anisotropic nanoparticles.

A D Sánchez, N Linale, J Bonetti

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    |June 2, 2020
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    Summary
    This summary is machine-generated.

    We used gold nanorods to create a novel waveguide with tunable nonlinear properties. This anisotropy leads to distinct modulation instability regimes, potentially advancing all-optical devices.

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    Area of Science:

    • Nonlinear optics
    • Plasmonics
    • Nanophotonics

    Background:

    • Anisotropic plasmonic behavior of gold nanorods (AuNRs) offers unique optical properties.
    • Nonlinear optical waveguides are crucial for advanced photonic devices.

    Purpose of the Study:

    • To develop a waveguide utilizing AuNRs with frequency and polarization-dependent nonlinear coefficients.
    • To investigate modulation instability (MI) in this novel waveguide system.

    Main Methods:

    • Extended Maxwell Garnett model for nonlinear optics with anisotropic nanoparticles.
    • Photon-conserving nonlinear Schrödinger equation (pcNLSE) for modeling light propagation.
    • Analysis of modulation instability regimes.

    Main Results:

    • Demonstrated a waveguide with tunable nonlinear coefficients based on AuNR anisotropy.
    • Identified two distinct modulation instability regimes due to nanorod anisotropy.
    • The nonlinear coefficient depends on both light frequency and polarization.

    Conclusions:

    • The anisotropic nature of AuNRs enables unique control over nonlinear optical phenomena.
    • The observed MI regimes offer potential for novel all-optical device applications.
    • This work advances the design of functional nanophotonic waveguides.