Dynamic long-period fiber grating through all-optical control based on MXene's photothermal effect

Recently, two-dimensional (2D) transition metal carbide/nitride (MXene) materials have been found to have an outstanding photothermal conversion efficiency by virtue of excellent electromagnetic wave absorption capacity and a localized surface plasmon resonance effect. Integrated photonics and optoelectronic devices based on 2D materials such as MXene are the core of future industrial developments. Here, we report an attractive all-optical control of long-period fiber grating (LPFG) by taking advantage of MXene's excellent photothermal conversion property. MXene is utilized as the photothermal tuning agent coated onto a bare section of LPFG. Experimental results reveal that the MXene-LPFG (MLPFG) is dynamic and the wavelength is tunable with external optical stimuli. The linear tuning sensitivity of wavelength is up to 72.6 pm mW(-1). This all-optical controlled MLPFG is highly potential in optical filters, active devices, and optical modulators.