Enhanced Magneto-Optical Kerr Effect of GaAs-Based P-N Junctions in the Terahertz Range
Enhanced Magneto-Optical Kerr Effect of GaAs-Based P-N Junctions in the Terahertz Range
复制标题
太赫兹范围内 GaAs 基 P-N 结的增强磁光克尔效应
DOI:
10.1007/s10762-021-00779-6
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Akiyama Hidefumi
中科院分区:
文献类型:
--
作者:
Miyagawa Keita;Nagai Masaya;Ashida Masaaki;Kim Changsu;Akiyama Hidefumi
We demonstrate that the magneto-optical Kerr effect at normal incidence in the terahertz (THz) frequency range is useful for evaluating carrier transport properties of particular layers of ap-njunction. Since a singlep-type thin film only exhibits a small magneto-optical Kerr effect, magneto-optical Kerr spectroscopy cannot be used to determine the carrier densities of such a film with high sensitivity. However, because the electric field is enhanced at thep-layer in ap-njunction due to the interference between the THz waves that are reflected at the highly doped substrate and thep-layer at the surface, it is possible to conduct magneto-optical Kerr spectroscopy with a higher sensitivity. We numerically calculate and experimentally determine the spectra of the ellipticity and polarization rotation angles for singlen- andp-GaAs epitaxial layers and GaAs-based photovoltaic devices with ap-i-nstructure and evaluate the carrier densities of then- andp-layers. At normal incidence, this method has a high spatial resolution, which is beneficial for imaging of large-area devices.
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