High power terahertz generation using 1550 nm plasmonic photomixers
- Electrical Engineering and Computer Science Department, University of Michigan, Ann Arbor, Michigan 48109 (United States)
- Department of Electrical Engineering and Information Technology, Technical University Darmstadt, D-64283 Darmstadt (Germany)
- Materials Department, University of California, Santa Barbara, California 93106 (United States)
We present a 1550 nm plasmonic photomixer operating under pumping duty cycles below 10%, which offers significantly higher terahertz radiation power levels compared to previously demonstrated photomixers. The record-high terahertz radiation powers are enabled by enhancing the device quantum efficiency through use of plasmonic contact electrodes, and by mitigating thermal breakdown at high optical pump power levels through use of a low duty cycle optical pump. The repetition rate of the optical pump can be specifically selected at a given pump duty cycle to control the spectral linewidth of the generated terahertz radiation. At an average optical pump power of 150 mW with a pump modulation frequency of 1 MHz and pump duty cycle of 2%, we demonstrate up to 0.8 mW radiation power at 1 THz, within each continuous wave radiation cycle.
- OSTI ID:
- 22303935
- Journal Information:
- Applied Physics Letters, Vol. 105, Issue 1; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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