Tunable terahertz emission from difference frequency in biased superlattices

Liu, Ren-Bao; Zhu, Bang-Fen
April 2004
Applied Physics Letters;4/12/2004, Vol. 84 Issue 15, p2730
Academic Journal
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 is larger than 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 the range of 0.5–6 THz. Continuous wave operation with 1% quantum efficiency and microwatt output power is feasible while the signal absorption in undoped superlattices is negligible. © 2004 American Institute of Physics.


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