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In a grating-coupled high-electron-mobility transistor,weak terahertz emission with wavelength around 400μm was observed by using a Fourier-transform spectrometer.The absolute terahertz emission power was extracted from a strong background blackbody emission by using a modulation technique.The power of terahertz emission is proportional to the drain-source current,while the power of blackbody emission has a distinct relation with the electrical power.The dependence on the drain-source bias and the gate voltage suggests that the terahertz emission is induced by accelerated electrons interacting with the grating. 相似文献
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针对大学物理专业课中刚体转动惯量的测定问题进行研究。选择合适的砝码及塔轮半径组合,让系统进行一次减速运动和一次加速运动,以测量刚体转动惯量。采用改进恒力矩的测定方法,实验阻力矩随角速度变化对实验结果的影响程度减小,测量结果准确性得到提高,误差减小。 相似文献
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