Journal
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
Volume 4, Issue 5, Pages 575-581Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TTHZ.2014.2342505
Keywords
Nanoscale devices; photoconductive antenna; plasmonics; terahertz source; ultrafast photoconductor
Funding
- DARPA Young Faculty Award [N66001-10-1-4027]
- NSF CAREER Award [N00014-11-1-0096]
- ONR Young Investigator Award [N00014-12-1-0947]
- ARO Young Investigator Award [W911NF-12-1-0253]
- Directorate For Engineering [1054454] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1305931] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys [1054454] Funding Source: National Science Foundation
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We present a photoconductive terahertz emitter that incorporates three-dimensional plasmonic contact electrodes to offer record high optical-to-terahertz power conversion efficiencies. By use of three-dimensional plasmonic contact electrodes the majority of photocarriers are generated within nanoscale distances from the photoconductor contact electrodes and drifted to the terahertz radiating antenna in a sub-picosecond time-scale to efficiently contribute to terahertz radiation. We experimentally demonstrate 105 mu W of broadband terahertz radiation in the 0.1-2 THz frequency range in response to a 1.4 mW optical pump, exhibiting a record high optical-to-terahertz power conversion efficiency of 7.5%.
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