Characterization of ErAs:GaAs and LuAs:GaAs Superlattice Structures for Continuous-Wave Terahertz Wave Generation through Plasmonic Photomixing |
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| Authors: | Shang-Hua Yang Rodolfo Salas Erica M Krivoy Hari P Nair Seth R Bank Mona Jarrahi |
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| Affiliation: | 1.Electrical Engineering Department,University of California Los Angeles,Los Angeles,USA;2.Electrical Engineering and Computer Science Department,University of Michigan,Ann Arbor,USA;3.Electrical and Computer Engineering Department,University of Texas at Austin,Austin,USA |
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| Abstract: | We investigate the impact of ErAs:GaAs and LuAs:GaAs superlattice structures with different LuAs/ErAs nanoparticle depositions and superlattice geometries on terahertz radiation properties of plasmonic photomixers operating at a 780-nm optical wavelength. Our analysis indicates the crucial impact of carrier drift velocity and carrier lifetime on the performance of plasmonic photomixers. While higher carrier drift velocities enable higher optical-to-terahertz conversion efficiencies by offering higher quantum efficiencies, shorter carrier lifetimes allow achieving higher optical-to-terahertz conversion efficiencies by mitigating the negative impact of destructive terahertz radiation from slow photocarriers and preventing the carrier screening effect. |
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