Terahertz optical sideband emission in self-assembled quantum dots

被引：4
|
作者：
Sandall, I. C. [1 ]
Porter, N. E. [1 ]
Wagner, M. [2 ]
Schneider, H. [2 ]
Winnerl, S. [2 ]
Helm, M. [2 ]
Wilson, L. [1 ]
机构：
[1] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England
[2] Forschungszentrum Dresden Rossendorf, Inst Ion Beam Phys & Mat Res, D-01314 Dresden, Germany
来源：
APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 20期
基金：
英国工程与自然科学研究理事会;
关键词：
WAVELENGTH CONVERSION; WELLS; GENERATION; EFFICIENCY; CONVERTER; LASER;
D O I：
10.1063/1.3429681
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A multilayer quantum dot sample has been excited with a strong terahertz (THz) electric field and probed with a near-infrared (NIR) laser. First- and second-order THz optical sidebands are generated on the NIR probe beam by driving quantum dot intersublevel resonances with the THz fields. A conversion efficiency of 3x10(-6) was obtained for the conversion of NIR power into sideband emission at 4 K, decreasing by a factor of 20 up to room temperature. The sideband emission wavelength can be tuned over similar to 20 nm by selection of appropriate NIR and THz frequencies, due to the inhomogeneous broadening of the dot ensemble. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3429681]
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页数：3
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