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21 May 2014 Dispersion studies in THz plasmonic devices with cavities
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Abstract
Analytical and numerical studies of the dispersion properties of grating gated THz plasmonic structures show that the plasmonic crystal dispersion relation can be represented in terms of effective index of the dielectric medium around the 2DEG for the plasmons. Forbidden energy band gaps are observed at Brillion zone boundaries of the plasmonic crystal. FDTD calculations predict the existence of the plasmonic modes with symmetrical, antisymmetrical and asymmetrical charge distributions. Breaking the translational symmetry of the crystal lattice by changing the electron concentration of the two dimensional electron gas (2DEG) under a single gate line in every 9th gate induces a cavity state. The induced cavity state supports a weekly-coupled cavity mode.
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Mustafa Karabiyik, Raju Sinha, Chowdhury Al-Amin, Gregory C. Dyer, Nezih Pala, and Michael S. Shur "Dispersion studies in THz plasmonic devices with cavities", Proc. SPIE 9102, Terahertz Physics, Devices, and Systems VIII: Advanced Applications in Industry and Defense, 91020K (21 May 2014); doi: 10.1117/12.2053447; https://doi.org/10.1117/12.2053447
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