PT Journal
AU Kataoka, T
   Kajikawa, K
   Kitagawa, J
   Kadoya, Y
   Takemura, Y
TI Improved sensitivity of terahertz detection by GaAs photoconductive antennas excited at 1560 nm
SO Appl. Phys. Lett.
JI Appl. Phys. Lett.
PY 2010
BP 201110 (1
EP 3)
VL 97
DE photoconductive antenna (PCA)
AB The terahertz detection by photoconductive antennas (PCAs) based on low-temperature grown (LTG) GaAs with 1.5 μm pulse excitation was revisited. We found that the detection efficiency can be improved by a factor of 10 (20 dB) by reducing the excitation spot size and the gap length of the PCA, maintaining the low noise feature of the PCA on LTG GaAs. As a result, the signal-to-noise ratio higher than 50 dB was obtained at a reasonable incident power of 9.5 mW, suggesting that the scheme is promising for the detection of terahertz waves in practical time domain systems.
ER