For an optical fiber, Radiation mode, or unbound mode, is an unbound mode.
In an optical fiber, a radiation mode is one having fields that are transversely oscillatory everywhere external to the waveguide, and which exists even at the limit of zero wavelength. Specifically, a radiation mode is one for which where β is the imaginary part (phase term) of the axial propagation constant, integer l is the azimuthal index of the mode, n (a) is the refractive index, where a is the core radius, and k is the free-space wave number, k = 2π/λ, where λ is the wavelength. Radiation modes correspond to refracted rays in the terminology of geometric optics.
The radiation has its origin in both the transition radiation, which occurs when the charge experiences an inhomogeneous dielectric environment provided by the crystal, and the conventional CR in a uniform material, in which coherence is preserved throughout the medium.
By discussing the general condition for Cherenkov radiation in photonic crystals, it is important to consider a particle of charge q moving at a constant velocity v on a z axis inside a photonic crystal.
The relative excitation strength of each mode is proportional to the magnitude of e.sub.kn(-g) multiplied by slow functions of k and g on the numerator of Eq.
For an optical fiber, Radiationmode, or unbound mode, is an unbound mode.
In an optical fiber, a radiationmode is one having fields that are transversely oscillatory everywhere external to the waveguide, and which exists even at the limit of zero wavelength.
Radiationmodes correspond to refracted rays in the terminology of geometric optics.
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