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The emergence of optical micro/nano-fiber (MNF) with a subwavelengthdiameter, which has ultra-light mass and an intense light field, brings anopportunity for develop fiber based optomechanical systems. In this study, wetheoretically show an optomechanical effect in silica MNF Bragg gratings(MNFBGs). The light-induced mechanical effect results in continuouslydistributed strain along the grating. It is shown that the power-related strainintroduces an optically reconfigurable chirp in the grating period. We developnew optomechanical coupled-mode equations and theoretically analyze theinfluence of the optical-force-induced nonlinearity and chirp on the gratingperformance. Compared with weak Kerr effect, the optomechanics effect dominatedin the properties evolution of MNFBGs and significant group velocity reductionand switching effect have been theoretically demonstrated at medium powerlevel. This kind of optomechanical MNFBG with optically reconfigurable chirpmay offer a path toward all-optical tunable bandwidth of Bragg resonance andmay lead to useful applications such as all-optical switching and opticallycontrolled dispersion and slow/fast light.

Reconfigurable optical-force-drive chirp and delay-line in micro/nano-fiber Bragg grating