研究目的
Investigating the efficiency of high-frequency signal transmission by semiconductor plasma antennas based on Ge and Si single crystals with surface nonequilibrium electron-hole plasma generated by laser diode radiation.
研究成果
The study demonstrated the feasibility of creating semiconductor plasma antennas by laser irradiation, showing significant improvements in signal transmission efficiency, especially with Ge crystals. The method offers advantages over gas-discharge plasma antennas, including lower energy requirements and higher carrier concentrations. Future research could explore applications in the terahertz frequency range and the development of controllable radiation absorbers.
研究不足
The study focused on the microwave frequency range and specific semiconductor materials (Ge and Si). The applicability to other frequency ranges or materials was not explored. The efficiency of the plasma antenna was found to depend on the laser power and the size of the irradiated region, indicating potential limitations in scalability and control.
1：Experimental Design and Method Selection:
The study involved the use of laser-induced plasma on semiconductor surfaces to create plasma antennas. The methodology included focusing laser radiation on semiconductor plates to generate electron-hole plasma and measuring the transmission characteristics of the resulting plasma antennas.
2：Sample Selection and Data Sources:
The experiments were performed on thin plates of Ge and Si single crystals with specified resistivities. The laser radiation was provided by a K976FA2RN-20.00W diode.
3：00W diode.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The setup included a laser diode, collimator, lens, semiconductor plates, ohmic contacts, a microwave carrier frequency generator (G4-82), a master oscillator, and a detector receiver based on a DK-V7M microwave diode.
4：Experimental Procedures and Operational Workflow:
The laser was focused on the semiconductor surface to create a plasma antenna. The efficiency of signal transmission was measured with and without laser irradiation, comparing the detector signal amplitudes.
5：Data Analysis Methods:
The data were analyzed by comparing the signal amplitudes detected by the receiver for the semiconductor antenna with and without laser irradiation, and by estimating the concentration of free carriers generated under laser irradiation.
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