All-Optical Control of Microfiber Knot Resonator Based on 2D Ti₂CT_x MXene

All-optical devices based on 2D materials have attracted great attention for desirable applications, such as communications and signal processing. However, the previously reported all-fiber all-optical devices utilizing the interferometer structures greatly limit their practical applications due to the poor anti-interference ability and slow modulation rate. In this work, an all-optical device has been demonstrated based on a microfiber knot resonator (MKR) deposited with Ti₂CT_x MXene, exhibiting a large photothermal conversion efficiency and high thermal conductivity. Experimental results show that the proposed all-optical device is capable of producing a high-performance phase and intensity modulation with a high modulation efficiency, fast response time, and good stability. Therefore, it is anticipated that the MKR-based all-optical devices based on 2D materials can pave the way to a new design of high-performance all-optical devices and have great potentials in the future optical information processing.