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Improved sensitivity of terahertz detection by GaAs photoconductive antennas excited at 1560 nm.
- Source :
-
Applied Physics Letters . 11/15/2010, Vol. 97 Issue 20, p201110. 3p. - Publication Year :
- 2010
-
Abstract
- 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 97
- Issue :
- 20
- Database :
- Academic Search Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 55330270
- Full Text :
- https://doi.org/10.1063/1.3519480