Narrow-Linewidth Interwell THz Intersubband Emission
MASSACHUSETTS INST OF TECH CAMBRIDGE
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Narrow-linewidth terahertz spontaneous emission resulting from interwell or diagonal intersubband transition from an electrically pumped multiple quantum-well MQW structure was observed. The center frequency of the emission peak is at 2.57 THz, and its full width at half maximum FWHM 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 using LO-phonon assisted depopulation.
- Quantum Theory and Relativity