3D Dirac semimetal supported tunable TE modes. (English) Zbl 07769812
Summary: The tunable propagation properties of transverse electric (TE) plasmonic modes have been investigated in the mid-IR spectral region by using air-Dirac semimetal (DSM)-Si asymmetric structures, including the effects of Fermi levels, temperatures, and scattering times. The results manifest that on the condition that the Fermi level of DSM layer is not very large (\(2|\mu_c| < \hbar\omega\)) and temperature is relatively high (about 100 K), the proposed DSM asymmetric structure supports obvious TE modes, which is quite different from the graphene symmetric structure limited to low liquid helium temperature. The transition frequency increases with Fermi level, the peak position of the real part and the saturation region of the imaginary part of effective index indicates an obvious blue shift. As temperature decreases, the contribution of interband transition becomes stronger, the 3D DSM indicates better dielectric properties and sustains stable TE mode. If scattering time is shorter than 0.1 ps, its effects on the propagation properties are very strong, resulting in a redshift of the real part of effective index. The results are very helpful to understand the tunable properties of DSM TE structures and aid the design of novel plasmonic devices, such as polarizers, modulators, and filters.
© 2021 Wiley-VCH GmbH
© 2021 Wiley-VCH GmbH
MSC:
| 81-XX | Quantum theory |
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