研究目的
Investigating the development and application of an ultrafast miniaturized pulsed electron gun for time-resolved low-energy electron diffraction to study structural dynamics at surfaces.
研究成果
The fabrication process and first application of a micrometer-scale ultrafast photoelectron gun were successfully reported, achieving electron pulse durations of 1.3 ps. Future improvements could enhance the temporal resolution to the femtosecond regime, offering unique insights into structural processes at surfaces.
研究不足
The temporal resolution, while impressive, may be further improved to reach the femtosecond regime. The current setup may also limit the types of surfaces that can be studied due to the specific requirements of the electron gun.
1：Experimental Design and Method Selection:
The microgun is developed using photolithography and focused ion beam etching, featuring a nanotip photocathode and an einzel lens for beam collimation.
2：Sample Selection and Data Sources:
The first application was the investigation of the optically-driven phase transition between the nearly commensurate and the incommensurate charge-density wave phase at the surface of single-crystalline 1T-TaS
3：List of Experimental Equipment and Materials:
Includes a tungsten photocathode, gold wire for electrostatic lenses, chromium conduction lines, and a glass support.
4：Experimental Procedures and Operational Workflow:
Assembly and electrical contacting of the gun involve photolithography and focused-ion-beam etching. Electron pulse duration and energy are measured in an ultra-high vacuum chamber.
5：Data Analysis Methods:
Temporal resolution is measured with the transient electric field effect, and diffraction patterns are analyzed to observe phase transitions.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
