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Propagation Losses of Guided Modes in an Optical Graded-Index Slab Waveguide with Metal Cladding

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4 Author(s)

Analytical results for propagation Iosses of guided modes in a graded-index slab waveguide (GISW) with metal cladding are presented. When the permittivity in the guiding layer decreases linearly away from the metal surface, the attenuation constant alphaG of well-guided modes, TE and TM, is approximately proportional to only the ratio (Delta epsiloni / epsilon0) / di, where Delta epsiloni is the increment in the permittivity at the metal surface in the direction of the polarization of optical waves, dii is the diffusion depth in this direction, and epsilon0 is the permittivity of free space.

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IEEE Transactions on Microwave Theory and Techniques  (Volume:25 ,  Issue: 9 )