In the whole wavelength range, the group refractive index of the TE mode and TM mode of the slot waveguide is much lower than that of the strip waveguide, and with the increase of the wavelength, the group refractive index of the TE mode and TM mode of the slot waveguide The refractive index shows a downward trend, and the refractive index has reached about 2.0 at 1700nm.
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