Capillary optical fiber for particle manipulation and sensing application

Hollow core fiber (HCF) is a powerful carrier in the fields of nonlinear optics, fiber sensing and lasers. It includes hollow photonic bandgap fiber (PBF), photonic crystal fiber (PCF), Silica capillary optical fiber (COF) and multi-hole fiber (MHF). Among them, the Silica capillary optical fiber, which is similar in diameter to the single-mode fiber (SMF) and consists of tubular cladding and air capillary, has a special hollow core structure. After being fused with other special optical fibers, a series of cascaded sensing devices with simple structure, high sensitivity and fast response speed can be prepared. In recent years, with the progress of optical fiber processing technology, researchers can freely design complex optical fiber shapes with higher precision and optical quality. In this paper, capillary optical fiber is used as the carrier platform of a new type of optical fiber integrated photonic device, and the generation and transmission process of Bessel-like beam and the optical manipulation process such as particle capture, rotation and shunt when it is applied to optical tweezers are summarized. The advantages of high-sensitivity sensor based on interference mechanisms such as FPI, AR, MZI, MMI and LPFG when it is applied to the sensing field are analyzed. The general rules of preparation and application of optical manipulation devices and optical sensing devices based on capillary fiber are summarized and prospected.