Why Do Field-Based Methods Fail to Model Plasmonics?

摘要: The paper studies plasmonics modeling issues and examines the reasons behind failure of field-based methods relying on Pade approximations widely used in analysis photonic devices based dielectric materials. Through a study evanescent, radiation, guided, surface modes plasmonic structure where appears clearly, we demonstrate physical explanation this suggest some remedies. We developed Bidirectional Beam Propagation Method (BiBPM) by adopting Blocked Schur (BS) algorithm to introduce an unconditionally stable method for structures with strong discontinuities. Central BiBPMs is accurate calculation square root operators that very performed using approximations. However, recent reports convergence too slow lend itself solver [1] . Moreover, completely fail handling such discontinuity between waveguides, very-wide spectrum could be excited. Alternatively, propose calculating these twice faster BS algorithm. Beyond computational speed, our suggested approach overbears Pade-based instability accuracy problems, thanks proper treatment evanescent waves: notorious sources instability. superiority has been determined numerically explained physically.