We report high Brillouin frequency shifts of 0.08±0.02 MHz/N in a 60 cm As2Se3-Poly(methyl methacrylate) (As2Se3-PMMA) hybrid microtaper with 2 μm As2Se3 core and 100 μm PMMA cladding diameters under a transverse load. Through finite element analysis of stimulated Brillouin scattering under the influence of contact stress from the loading fixture, such shifts are in accordance with a numerical value of 0.06±0.01 MHz/N. Further numerical analysis shows that uncertainties in the Brillouin frequency shift are the result of birefringence that is 27 times stronger than what is found in standard silica fibers.
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Saxena et al. (2019) studied this question.
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