Abstract
Surface plasmonic waveguides usually only support one mode called TM (transverse magnetic) mode. Recently, one waveguide structure that can propagate both TE (transverse electric) and TM mode was proposed. However, the large propagation loss of the plasmonic waveguides with low polarization dependence is still a problem. In order to make loss compensation to solve the problem, this paper makes improvements to decrease the loss of this kind of waveguide. Simulations have been made to prove the feasibility; as respected, low loss or even 0dB can be reached at both modes when low and high index materials are added. The improved plasmonic waveguide has a potential application in guiding and processing of light from a fiber with a random polarization state in low-loss condition and also can be applied to integrated optics devices.
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