Non-transverse Electromagnetic fields in micro and nano fibers

We present an analytical and numerical study of electromagnetic modes in micro and nano fibers (MNFs) where the electric and magnetic fields of the modes are not necessarily orthogonal to each other. We first investigate these modes for different fiber structures including photonic crystal fibers. We then discuss two specific applications of these modes: (1) Generation of hypothetical axions that are coupled to the electromagnetic fields through the dot product of electric and magnetic fields of a mode, $\vec{E} \cdot \vec{B}$, and (2) a new type of optical traps (optical tweezers) for chiral atoms with magneto-electric cross coupling, where the confining potential again is proportional to $\vec{E} \cdot \vec{B}$