Details

Autor(en) / Beteiligte

• Kataoka, T
• Kajikawa, K
• Kitagawa, J
• Kadoya, Y
• Takemura, Y

Titel

Improved sensitivity of terahertz detection by GaAs photoconductive antennas excited at 1560 nm

Ist Teil von

• Applied physics letters, 2010-11, Vol.97 (20), p.201110-201110-3

Ort / Verlag

American Institute of Physics

Erscheinungsjahr

2010

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The terahertz detection by photoconductive antennas (PCAs) based on low-temperature grown (LTG) GaAs with 1.5   μ m 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.