期刊
APPLIED PHYSICS LETTERS
卷 104, 期 8, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4866807
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资金
- Michigan Space Grant Consortium
- DARPA [N66001-10-1-4027]
- NSF [N00014-11-1-0096]
- ONR [N00014-12-1-0947]
- ARO [W911NF-12-1-0253]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1054454, 1305931] Funding Source: National Science Foundation
An array of 3 x 3 plasmonic photoconductive terahertz emitters with logarithmic spiral antennas is fabricated on a low temperature (LT) grown GaAs substrate and characterized in response to a 200 fs optical pump from a Ti:sapphire mode-locked laser at 800 nm wavelength. A microlens array is used to split and focus the optical pump beam onto the active area of each plasmonic photoconductive emitter element. Pulsed terahertz radiation with record high power levels up to 1.9 mW in the 0.1-2 THz frequency range is measured at an optical pump power of 320 mW. The record high power pulsed terahertz radiation is enabled by the use of plasmonic contact electrodes, enhancing the photoconductor quantum efficiencies, and by increasing the overall device active area, mitigating the carrier screening effect and thermal breakdown at high optical pump power levels. (C) 2014 AIP Publishing LLC.
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