  We have derived and investigated analytical expressions for the spontaneous
emission radiative decay rate of an optically active (chiral) molecule placed
near a chiral (bi-isotropic) triaxial nanoellipsoid, which size is much smaller
than the wavelength. Differences in radiative decay rates of optically active
molecule enantiomers located near the surface of chiral nanoparticles of
spherical, prolate spheroidal, and ellipsoidal shapes have been investigated.
It is shown that the change of the nanoparticle shape from spherical to
ellipsoidal can lead to substantial enhancement of the spontaneous emission
radiative decay rate of molecule enantiomers of one type in comparison with the
decay rate of the other type of enantiomers.

Optics