Journal
OPTICS EXPRESS
Volume 23, Issue 24, Pages 31206-31215Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.031206
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Funding
- Presidential Early Career Award for Scientists and Engineers [N00014-14-1-0573]
- NSF CAREER Award [N00014-11-1-0096]
- ONR Young Investigator Award [N00014-12-1-0947]
- ARO Young Investigator Award [W911NF-12-1-0253]
- Science Foundation Ireland IPIC program [12/RC/2276]
- European Space Agency project FIRLO
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1054454, 1305931] Funding Source: National Science Foundation
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We demonstrate a compact, robust, and stable terahertz source based on a novel two section digital distributed feedback laser diode and plasmonic photomixer. Terahertz wave generation is achieved through difference frequency generation by pumping the plasmonic photomixer with two output optical beams of the two section digital distributed feedback laser diode. The laser is designed to offer an adjustable terahertz frequency difference between the emitted wavelengths by varying the applied currents to the laser sections. The plasmonic photomixer is comprised of an ultrafast photoconductor with plasmonic contact electrodes integrated with a logarithmic spiral antenna. We demonstrate terahertz wave generation with 0.15-3 THz frequency tunability, 2 MHz linewidth, and less than 5 MHz frequency stability over 1 minute, at useful power levels for practical imaging and sensing applications. (C) 2015 Optical Society of America
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