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(a) Wavelength change of the interference fringe around 1550 nm as a function of tensile strain applied to the air-cavity-based FPI samples: (
) S1, (
) S2, (
) S3 and (
) S4, with a cavity length of 88, 85, 62 and 61 μm, respectively;(b) Reflection spectrum evolution of the rectangular air bubble sample, i.e. S4, while the tensile strain increases from 0 to 400 με.
