Journal
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
Volume 5, Issue 2, Pages 223-229Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TTHZ.2015.2395417
Keywords
Large-area emitter; photoconductivity; plasmonics; terahertz source
Funding
- Presidential Early Career Award for Scientists and Engineers [N00014-14-1-0573]
- National Science Foundation [N00014-11-1-0096]
- Office of Naval Research [N00014-12-1-0947]
- ARO through 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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In this paper, we present a novel design of large-area photoconductive emitters which incorporates plasmonic contact electrodes to offer significantly higher optical-to-terahertz conversion efficiencies compared with conventional designs. Use of plasmonic contact electrodes enables a more efficient separation and acceleration of photocarriers, enhancing the effective dipole moment induced within the device active area in response to an incident optical pump. At an optical pump power level of 240 mW, we demonstrate broadband, pulsed terahertz radiation with radiation power levels as high as 3.8 mW over the 0.1-5-THz frequency range, exhibiting an order of magnitude higher optical-to-terahertz conversion efficiency compared with conventional designs.
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