Abstract
We investigate chirality of light in the quasicircularly polarized fundamental HE11 mode and thequasicircularly polarized higher-order hybrid modes of vacuum-clad ultrathin optical fibers. Weshow that, for a given fiber with the parameters in the range of experimental interest, the higherorder modes have smaller optical chirality per unit energy than the fundamental mode. The sign ofthe chirality per unit energy of a HE or EH mode is the same as or opposite to, respectively, thesign of the phase circulation direction. Outside the fiber, the fields in the quasicircularly polarizedHE11 mode and the quasicircularly polarized higher-order HE21 and HE31 modes are superchiral.
Highlights
Guided fields of vacuum-clad ultrathin optical fibers [1,2,3] penetrate deeply into the surrounding medium and appear as an evanescent wave carrying a significant fraction of the power c 2017 Vietnam Academy of Science and Technology and having a complex polarization pattern [4,5,6]
We introduce the index p = +1 or −1 for the counterclockwise or clockwise phase circulation direction, which indicates that the azimuthal phase factor is eilφ or e−ilφ
We have studied chirality of light in the quasicircularly polarized fundamental and higherorder hybrid modes of vacuum-clad ultrathin optical fibers
Summary
Guided fields of vacuum-clad ultrathin optical fibers [1,2,3] penetrate deeply into the surrounding medium and appear as an evanescent wave carrying a significant fraction of the power c 2017 Vietnam Academy of Science and Technology. Spontaneous emission and scattering from an atom with a circular dipole near a nanofiber can be asymmetric with respect to the opposite axial propagation directions [30,31,32,33,34] These directional effects are optical chiral effects and the signature of spin-orbit coupling of light [35,36,37,38,39,40,41]. Tang and Cohen have introduced a chirality measure for the interaction between chiral light and chiral molecules with mixed electricmagnetic dipole polarizability They have shown that the local values of this measure of chirality at the nodes of a circularly polarized standing wave can be larger than for circularly polarized light [42, 43].
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