1) Optical tweezers;
2) Fiber-based brain-like devices;
3) Specialty optical fiber and microstructured device;
4) Fiber optic sensing technology;
In the optical manipulation field, we have systematically developed the theory, method and technology of fiber optic optical tweezers, proposed an innovative idea of using laser-induced photophoretic force, pioneered the operation and control of trapping, moving and vibration of absorbing particles in liquid environment, and realized the first all-optical action of single fiber optical tweezer scheme. We proposed a new multiplexing method and control mechanism for single-core fiber optical tweezers, new concepts such as wavelength division multiplexing optical tweezers and polarization multiplexing optical tweezers, proposed the concept of using fiber optical tweezers to constitute a practical fiber optic sensor, and realized for the first time tiny force sensing, acceleration sensing, and temperature sensing based on the principle of optical tweezers.
In the areaof Fiber-based brain-like devices, we have developed brain-like neural cells based on smart optical fiber devices; proposed a new method for all-optical fiber brain-like computing functions based on phase change materials; developed a new scheme for all-optical spiking neural network based on fiber-integrated devices.
In theresearch of specialty optical fiber and microstructured device, A variety of new optical fiber sensing principles, micro-compact devices and sensing systems have been developed, and new integrated optical fiber devices with various structures have been realized, such as fiber SPR sensor, spider silk-basedfiber sensor, dual-core Michelson interferometer, coaxial dual-waveguide Michelson interferometer, and dual-core Mach-Zhender interferometer.
 Zhang Y, Zhang Y, Liu Z, et al. Laser-induced microsphere hammer-hit vibration in liquid[J]. Physical Review Letters, 2018, 121(13): 133901.
 Duan R, Sun J, Zhang Y, et al. A Non-volatile Quasi-Continuous All-Optical Fiber Programmable Platform Based on GST-Coated Microspheres[J]. ACS Photonics, 2022, 9(4): 1180-1187.
 Liu Z, Cheng S, Zhang Y, et al. Intelligent all-fiber device: storage and logic computing[J]. Photonics Research, 2022, 10(2): 357-363.
 Liu Z, Liu W, Lai B, et al. SPR sensor based on Bessel-like beam[J]. Optics Express, 2021, 29(12): 18305-18314.
 Liu Z, Zhang M, Zhang Y, et al. Spider silk-based humidity sensor[J]. Optics Letters, 2019, 44(11): 2907-2910.