Abstract
The results of experimental investigation into the dielectric losses in GaAs, InP:Fe, and Si semiconductor crystals in the millimeter wavelength range (80–260 GHz) using the original precise method of measuring the reflectance and dielectric-loss tangent tanδ based on open high-quality Fabry–Perot cavities are presented. It is shown that the losses in the frequency range from 100 to 260 GHz in ultrapure semiconductor single-crystal GaAs substrates are mainly determined by lattice absorption, while the main loss mechanism in single-crystal silicon is absorption by free carriers; herewith, tan δ ≈ (1–2) × 10–4 even for a noticeable, at a level of 1012 cm–3, free carrier concentration. In contrast with GaAs and Si, tanδ in compensated InP:Fe crystals is almost independent of frequency in the range from 100 to 260 GHz, which is associated with the material conductivity and optimization of microwave semiconductor devices, in particular, frequency-multiplication devices and devices of the controlled emission output of continuous and pulsed gyrotrons.
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Funding
This study was supported by the Russian Scientific Foundation, project no. 18-79-10112. The statement of the problem on using semiconductor mirrors in the compression circuit of pulses of megawatt gyrotrons for the high-gradient acceleration of particles and evaluation of the main parameters of semiconductors required to solve this problem are formulated in the Russian Science Foundation project no. 19-79-30071.
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Maremyanin, K.V., Parshin, V.V., Serov, E.A. et al. Investigation into Microwave Absorption in Semiconductors for Frequency-Multiplication Devices and Radiation-Output Control of Continuous and Pulsed Gyrotrons. Semiconductors 54, 1069–1074 (2020). https://doi.org/10.1134/S1063782620090195
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DOI: https://doi.org/10.1134/S1063782620090195