EIGENFUNCTION EXPANSION OF THE DYADIC GREENS-FUNCTION IN A GYROELECTRIC CHIRAL MEDIUM BY CYLINDRICAL VECTOR WAVE-FUNCTIONS

Gyroelectric chiral media, which blend gyroelectric effects with those of optical activity, have potential applications in chirality managem ent. In the present investigation, based on the Ohm-Rayleigh method, t he dyadic Green's function in an unbounded gyroelectric chiral medium is rigorously represented in an eigen function expansion of the cylind rical vector wave functions. The analysis reveals that the singularity of the dyadic Green's function is essentially static in character and independent of the chiral parameter. Due to the effects of optical ac tivity, two types of eigenwaves, left- and right-handed circularly pol arized waves traveling with different wave numbers, can be simultaneou sly excited in a gyroelectric chiral medium, Nonreciprocal property of the dyadic Green's function, owing to the gyroelectric effects, is re vealed. It is found that the chiral effects of the gyroelectric chiral medium are manageable with the introduction of a controllable gyroele ctric parameter to manage the wave numbers of the eigenwaves propagati ng in this class of medium.