Terahertz electromagnetic waves emitted from semiconductor investigated using terahertz time domain spectroscopy
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摘要:
1.Introduction Ultrafast non-equilibrium transport of carriers in semiconductors biased at high electric fields is of fundamental interest in semiconductor physics.From a fundamental point of view,the detailed understanding of the femtosecond dynamics of carriers in an electric field is a key issue in many body physics.Furthermore,the clarification of carrier dynamics under extreme non-equilibrium conditions is strongly motivated by the need to obtain information relevant to the design of ultrahigh speed devices.Even the use of transit times with less than 1 ps has been reported for compound semiconductor field effecttransistors[1].