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Proceedings Paper

Plasmonic photoconductive terahertz optoelectronics
Author(s): Shang-Hua Yang; Christopher W. Berry; Ning Wang; Mohammad R. Hashemi; Mona Jarrahi
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Paper Abstract

Photoconductive terahertz sources are one of the most promising solutions for terahertz generation and are extensively used in terahertz spectroscopy and imaging systems. In spite of their great promise, the inherent tradeoff between the high quantum-efficiency and ultrafast operation of conventional photoconductors has significantly limited the output power and efficiency of existing photoconductive terahertz sources. Here, we present a novel design of photoconductive terahertz sources incorporating three-dimensional plasmonic contact electrodes and comprehensively characterize its superior performance in comparison with previously demonstrated photoconductive terahertz sources based on twodimensional plasmonic contact electrodes. We show that the use of three-dimensional plasmonic contact electrodes manipulates the three-dimensional spatial distribution of photocarriers in nanoscale and significantly boosts the number of the photocarriers in close proximity to the contact electrodes. Therefore, it enables efficient transport of the majority of photocarriers to the contact electrodes in a sub-picosecond time-scale, mitigating the tradeoff between high quantumefficiency and ultrafast operation and offering high optical-to-terahertz conversion efficiencies. We present the design and implementation of the first generation photoconductive terahertz sources based on three-dimensional plasmonic contact electrodes. At an optical pump power of 1.4 mW, we experimentally demonstrate a record-high optical-toterahertz conversion efficiency of 7.5%, which is significantly higher that the optical-to-terahertz conversion efficiency of previously demonstrated photoconductive terahertz sources based on two-dimensional plasmonic contact electrodes.

Paper Details

Date Published:
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Proc. SPIE 8985, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VII, 898503; doi: 10.1117/12.2040855
Show Author Affiliations
Shang-Hua Yang, Univ. of Michigan (United States)
Univ. of California, Los Angeles (United States)
Christopher W. Berry, Univ. of Michigan (United States)
Ning Wang, Univ. of Michigan (United States)
Univ. of California, Los Angeles (United States)
Mohammad R. Hashemi, Univ. of Michigan (United States)
Univ. of California, Los Angeles (United States)
Mona Jarrahi, Univ. of Michigan (United States)
Univ. of California, Los Angeles (United States)


Published in SPIE Proceedings Vol. 8985:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VII
Laurence P. Sadwick; Créidhe M. O'Sullivan, Editor(s)

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