The authors studied the problem of computing electromagnetic guided waves in a close inhomogeneous dielectric three-dimensional waveguide at a given frequency. The key idea of the method is to add the term \(\Lambda E\) for \(\Lambda> 0\) on both sides of the Maxwell equation.
Then they obtain a sesquilinear form which is autonomous and verify two inf-sup conditions. Then they present several numerous experiments and show the limits of their method.