FIG. 1. Waveguide configuration. (a) Sketch of the waveguide configuration that is assumed spatial invariant along the x and z directions. (b) The electric field of the TE1 mode for propagation along the z direction and a PMMA thickness of 400 nm. (c) The real part of the effective index Neff ¼ β=k0, where β is the propagation constant of the mode and k0 is the vacuum wave number, and (d) the propagation length for modes sustained by the configuration in (a) as a function of the PMMA thickness. The SiO2 thickness is fixed at 70 nm, and the wavelength is λ ¼ 1550 nm.
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