Microwave Emission from GaAs
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概要
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An emission of microwaves from n-GaAs was observed, when the strong electric field was applied. Previously we have reported the current saturations and oscillations in n-GaAs at 77°K. The microwave emissions may be considered correlate effect as will be reported in the present note. The specimens were cut in the form of the bars (O.1×O.05×O.05 cm^3) alloyed with tin contacts and held at the center of an X-band waveguide with their lengths along the direction of the microwave electric field. The current pulses of 5 to 1Oμ sec duration were applied at the repetition rate of 1 kc/sec. The output signal from the waveguide was detected by a detector diode (IN23B), amplified by 40dB using a dc amplifier and observed with a Tektronix oscilloscope. As the applied electric field was increased to reach a certain critical value, the current-voltage characteristic showed a remarkable current saturation effect and, in some cases, sbowed a small decrease of its slope, at room temperature as well as at 77°K. As the current saturated or the small decrease of the slope of the current-voltage curve occurred, the emission of microwaves was observed. Fig. 1 sbows the correlation between the current-voltage characteristic and the detected output from the waveguide. There were some oscillations in the current at frequencies of several tens megacycles per second. But, the microwave radiations were not so strongly correlated to the current oscillations. So, it is unlikely that the observed microwave signal is the higher harmonics of the current oscillations. However, there may be some components of the current oscillations with too high frequencies to be observed with the oscilloscope.
- 社団法人日本物理学会の論文
- 1964-06-05