1.Ultrafast Optoelectronics and Terahertz Science and Technology:Ultrafast Optoelectronic Physics and Devices: (1) High-gain ultrafast GaAs photoconductive semiconductor switches for generating high-power, high-repetition-rate sub-nanosecond narrow pulses; (2) High-voltage and high-current characteristics of GaAs ultrafast optoelectronic devices under extreme physical conditions, and the physical limits of timing jitter; (3) Physical effects of synchronization-triggered synthesis precision.
2.Terahertz Science and Technology: (1) Physics and devices of avalanche multiplication and photoconductive terahertz radiation sources and their arrays; (2) Physics and devices of terahertz photoconductive holographic detectors and their arrays; (3) Physics and technology of terahertz detection for trace water-containing biological and other samples.