| With the rapid development of optoelectronics and nanotechnology, the demanding of integrated density on systems have become increasingly higher. Surface plasmon polariton waveguides not only restrain to the maximum electromagnetic field at the interface between the metal and dielectric, but also in application of the high speed data transmission photonics have huge advantages. It can break the diffraction limit, the integration density of the system will be greatly enhanced.Based on the analysis of the traditional surface plasmon polariton waveguide, the paper proposed a novel symmetric hybrid long-range surface plasmon polariton waveguide structure. We made use of finite element numerical simulation software to study the mode effective index, mode width, figures of merit and coupling length of the structure at the telecom wavelength1550nm for different of polymer ridge and relatively low index dielectric regions (RLIDRs) under the metal by two aspects. On the one hand, we analysis the important parameters by changing Hdom, on the other hand, we analysis the important parameters of the symmetric structure by changing h. It is shown that the propagation length of the symmetric structure increased24%, figures of merit M2and M3improved27%and66%respectively, coupling length up to400mm compared with no cladding strcture. When h changes between350nm and410nm, propagation length up to maximum1394um at h=395nm and oscillates aroud1394um,it is not sensitive to manufacturing error, so it is advantageous to process and manufacture the symmetric hybrid long-range surface plasmon polariton waveguide structure. The proposed structure achieved not only small transmission loss, but also a good binding ability, So it provides a better trade-off between the propagation length and mode confinement. For the advantages, the symmetric hybrid long-range surface plasmon polariton waveguide is a potential application for realizing highly functional density photonic integration circuits. |
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