Terahertz Emission from Narrow Gap Semiconductors Photoexcited by Femtosecond Laser Pulses |
| R. Adomavičius, A. Urbanowicz, G. Molis and A. Krotkus
Semiconductor Physics Institute, A. Goštauto 11, 01108, Vilnius, Lithuania |
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| Received: 22 08 2004; |
| Large increase in the emitted terahertz power was observed for p-InAs samples with the p-doping levels of approximately 1016-1017 cm-3. This increase was explained by a large surface depletion layer and an electric-field-induced optical rectification effect in the layer. Terahertz fields radiated by the samples of all three investigated CdxHg1-xTe layers was of the same order of magnitude. No azimuthal angle dependence of the radiated signal was detected, which evidences that linear current surge effect is dominating over nonlinear optical rectification. Azimuthal angle and magnetic fields emission witness that it is caused by linear photo-Dember type processes. |
| DOI: 10.12693/APhysPolA.107.132 PACS numbers:42.65.Re, 07.57.Hm, 78.47.+p, 72.30.+q |