Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2003-11-20
Applied Physics Letters 84, 2730 (2004)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
3pages 2figures
Scientific paper
10.1063/1.1703849
The terahertz emission from difference-frequency in biased superlattices is calculated with the excitonic effect included. Owing to the doubly resonant condition and the excitonic enhancement, the typical susceptibility can be as large as $10^{-5}$ m/V. The doubly resonant condition can always be realized by adjusting the bias voltage and the laser frequencies, thus the in-situ tunable emission is efficient in a range of several terahertz. Continuous wave operation with 1% quantum efficiency and $\mu$W output power is feasible as the signal absorption in undoped superlattices is negligible.
Liu Ren-Bao
Zhu Bang-fen
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