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Dielectric Polarization in a Capacitor

The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Polarization instability in a waveguide geometry.

C M de Sterke, J E Sipe

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    Summary
    This summary is machine-generated.

    Polarization instability in planar optical waveguides is theoretically demonstrated. This phenomenon facilitates energy exchange between spatial solitons and causes amplitude-modulation gain.

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    Area of Science:

    • Nonlinear optics
    • Waveguide optics
    • Theoretical physics

    Background:

    • Spatial solitons are fundamental in nonlinear optics.
    • Optical waveguides confine and guide light.
    • Polarization dynamics are crucial for light propagation in anisotropic media.

    Purpose of the Study:

    • To theoretically investigate polarization instability in planar optical waveguides.
    • To explore the implications of this instability on spatial solitons.
    • To analyze the potential for amplitude-modulation gain.

    Main Methods:

    • Theoretical analysis of light propagation in planar waveguides.
    • Mathematical modeling of soliton behavior.
    • Derivation of conditions for polarization instability.

    Main Results:

    • Demonstration of polarization instability in planar optical waveguides.
    • Prediction of energy exchange between TE(0) and TM(0) spatial solitons.
    • Theoretical basis for amplitude-modulation gain in this geometry.

    Conclusions:

    • Polarization instability is a viable phenomenon in planar optical waveguides.
    • This instability offers a mechanism for soliton energy exchange and gain.
    • Findings may guide future experiments in nonlinear waveguide optics.