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Calculated force sensitivity SF as a function of fiber radius r.
(a) FIB image of the MFBG with 200 periods (∼112 μm in length and Λ = 560 nm). (b) Magnified image of the grating.
Measurement setup for the MFBG force sensor.
(a) Reflection spectra of the MFBG force sensor under different forces (0 N, 0.00207 N, 0.00414 N, and 0.00620 N). (b) Bragg wavelength shift of a 2.5 μm-diameter MFBG as a function of the applied force.
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