TITLE

Tunable terahertz emission from difference frequency in biased superlattices

AUTHOR(S)
Liu, Ren-Bao; Zhu, Bang-Fen
PUB. DATE
April 2004
SOURCE
Applied Physics Letters;4/12/2004, Vol. 84 Issue 15, p2730
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
12754155

 

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