Significant noise current decrease in a terahertz photoconductive antenna-detector based on a strain-induced InAlAs/InGaAs superlattice
Lavrukhin D. V.1, Goncharov Yu. G.2, Khabibullin R. A.1,3, Zaytsev K. I.2, Ponomarev D. S.1,3
1 Institute of Ultra High Frequency Semiconductor Electronics of RAS, Moscow, Russia
2Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
3Bauman Moscow State Technical University, Moscow, Russia
Email: ponomarev_dmitr@mail.ru
We registered a significant decrease of the noise current of a photoconductive antenna (PCA), which is based on a strain-induced InAlAs/InGaAs superlattice with an ultrashort photocarrier lifetime due to a decrease in the focal spot size of a probe laser beam. We showed that the proposed PCA-detector exhibits merely a 1.5-fold increase of the noise current, while the THz power boost reaches a 10-fold magnitude. This feature can be used, in particular, to detect small THz signals. The PCA-detector shows a ~ 65 dB in its signal-to-noise ratio within 0.1-4.0 THz bandwidth. Keywords: Terahertz frequency, photoconductive antenna, THz detector, InGaAs/InAlAs superlattice.
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