Efficient terahertz emission from ballistic transport enhanced n-i-p-n-i-p superlattice photomixers

被引：58
作者：
Preu, S. [1 ]
Renner, F. H.
Malzer, S.
Doehler, G. H.
Wang, L. J.
Hanson, M.
Gossard, A. C.
Wilkinson, T. L. J.
Brown, E. R.
机构：
[1] Univ Erlangen Nurnberg, Inst Opt Informat & Photon, Max Planck Res Grp, D-91058 Erlangen, Germany
[2] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA
[3] Univ Calif Santa Barbara, Dept Elect & Comp Engn, Santa Barbara, CA 93106 USA
来源：
APPLIED PHYSICS LETTERS | 2007年 / 90卷 / 21期
关键词：
D O I：
10.1063/1.2743400
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The authors report on photomixing terahertz sources that overcome the transit time versus RC-time trade-off and allow for independent optimization of both of them, using a n-i-p-n-i-p superlattice. Furthermore, they take advantage of ballistic transport for reduced transit times. Apart from more favorable material parameters, In(Al)GaAs photomixers benefit from the advanced telecommunication laser technology around 1.55 mu m as compared to GaAs. In such devices, a terahertz-power output of 1 mu W has been achieved at 0.4 THz at a photocurrent of 3.8 mA. A comparison between corresponding GaAs- and InGaAs-based n-i-p-n-i-p photomixers reveals an improvement of performance by at least an order of magnitude for the latter one. (c) 2007 American Institute of Physics.
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页数：3
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