Abstract
We report fabrication and simulation of an F2 glass six-strut suspended core fiber (SCF) with small effective core diameter of 2.5 μm for cylindrical vector (CV) modes generation and propagation. Simulation results show that the fiber has a large effective refractive index difference in the order of 10-4-10-3 between the first higher-order CV modes, including TE01, HE21even and odd and TM01 modes. TE01 and TM01 were experimentally generated and were evaluated as having high purity of 82 percent and 85 percent, respectively. The results demonstrate that the SCF is a competitive waveguide candidate for selectable CV mode generation and propagation.
Highlights
The cylindrical vector (CV) beams and orbital angular momentum (OAM) beams, characterized by a dark hollow center, have special properties with phase or polarization singularities
The results demonstrate that the suspended core fiber (SCF) is a competitive waveguide candidate for selectable CV mode generation and propagation
With limited length of useful fabricated fiber, the length of the fabricated six-strut SCF for CV modes excitation testing varied from 30 cm to 80 cm
Summary
The cylindrical vector (CV) beams and orbital angular momentum (OAM) beams, characterized by a dark hollow center, have special properties with phase or polarization singularities. The hybrid HE21 mode in fiber has been studied for fiber based stimulated emission depletion (STED) nano/microscopy [26,27] All these fiber-based applications require a fiber that is capable of generating and propagating distinct, pure CV modes. Fibers that have large mode propagation constants differences (i.e. large effective index differences) are required to deliver stable, pure CV modes for fiber-based STED microscopy. Fibers with specially designed glass claddings [24,26] have large core/cladding index contrast and large effective index differences They were demonstrated to support CV modes propagation for STED application. The purity of the experimentally generated TE01 and TM01 modes was found to be 82% and 85%, respectively
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