Electromagnetic modes
Spectral function of the disordered W1 waveguide
Electromagnetic modes of a disordered photonic crystal.
Prof. Vincenzo Savona (LTPN - Laboratory of Theoretical Physics of Nanosystems) describes a new perspective in the modeling of the electromagnetic field in spatially extended photonic crystal structures by introducing a computational method called Bloch-mode expansion. The method can address photonic structures characterized by small variations with respect to a spatially periodic photonic crystal. For such structures, the electromagnetic modes can be computed in a virtually exact fashion at a minimal computational cost, as demonstrated through two examples of application that complete the article. The method can be successfully employed in a wide range of situations, among which to model the effects of structural disorder, or to characterize the resonant modes of high-Q photonic crystal cavities based on slow modulations of a photonic crystal waveguide. Given its versatility and ease of implementation, this new approach holds great promise as an effective tool for the modeling and design of photonic devices.
Vincenzo Savona, Phys. Rev. B 83, 085301 (2011) - article labeled as Editor's Suggestion.