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Recently, the strain engineering of two-dimensional materials such asgraphene has attracted considerable attention for its great potential infunctional nanodevices. Here, we theoretically and experimentally investigatethe strain manipulation of a graphene-integrated microfiber system for thefirst time. We analyze the influential factors of strain tuning, i.e., thegeometrical parameters of the microfiber, the strain magnitude, and theprobe-light wavelength. Moreover, we experimentally achieve in-line modulationas high as 30% with a moderate strain of ~5%, which is two orders of magnitudelarger than previous results. The dynamic vibration response is alsoresearched. The broadband, polarization-independent, cost-effective,strain-based modulator may find applications in low-speed modulation and strainsensing. Further, we believe that our platform may allow for all-in fiberengineering of graphene-analogue materials and provide new ideas forgraphene-integrated flexible device design.

Mechanical Modulation of Hybrid Graphene Microfiber Structure