SURFACE-MODES IN A 2D ARRAY OF SQUARE DIELECTRIC CYLINDERS

We have studied surface modes in a dielectric array of parallel cylind ers having a square cross-section and forming a square lattice. The su rface plane is parallel to one cylinder side, itself parallel to one s ide of the (square) unit cell. We have found that surface electromagne tic modes can propagate along the surface in the direction perpendicul ar to the cylinders. The properties of these modes are strongly depend ent on the position of the surface, that is on the cut-plane through t he cylinders. They can propagate for both complete and incomplete (tru ncated) layers of cylinders and can exist within incomplete band-gaps. The modes reported here are characterized by a maximum value of the p ropagation constant, determined by a bulk band or by the crossing of t wo such bands. Copyright (C) 1996 Elsevier Science Ltd