Narrow-linewidth terahertz spontaneous emission resulting from interwell (or diagonal) intersubband transition from an electrically pumped multiple-quantum-well structure was observed. The center frequency of the emission peak is at 2.57 THz, and its full width at half maximum is 0.47 THz. The emission frequency is in good agreement with the calculated intersubband transition energy of 11.3 meV (corresponding to 2.7 THz) in a three-level system, which was designed to achieve population inversion between two radiative levels.
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Williams et al. (1999) studied this question.
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