A polarization-insensitive plasmonic photoconductive terahertz emitter
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AbstractWe present a polarization-insensitive plasmonic photoconductive terahertz emitter that uses a two-dimensional array of nanoscale cross-shaped apertures as the plasmonic contact electrodes. The geometry of the cross-shaped apertures is set to maximize optical pump absorption in close proximity to the contact electrodes. The two-dimensional symmetry of the cross-shaped apertures offers a polarization-insensitive interaction between the plasmonic contact electrodes and optical pump beam. We experimentally demonstrate a polarization-insensitive terahertz radiation from the presented emitter in response to a femtosecond optical pump beam and similar terahertz radiation powers compared to previously demonstrated polarization-sensitive photoconductive emitters with plasmonic contact electrode gratings at the optimum optical pump polarization.
CitationLi X, Yardimci NT, Jarrahi M (2017) A polarization-insensitive plasmonic photoconductive terahertz emitter. AIP Advances 7: 115113. Available: http://dx.doi.org/10.1063/1.5006273.
SponsorsThe authors gratefully acknowledge the financial support from Moore Inventor Fellowship, National Institutes of Health (#1R01GM112693-01A1), and King Abdullah University of Science and Technology Competitive Research Grant.