Journal
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
Volume 10, Issue 1, Pages 51-57Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TTHZ.2019.2951055
Keywords
Circular polarization; magnetic field modulation; magneto-optic spectroscopy; semiconductor; terahertz (THz)
Funding
- Office for Industry-University Co-Creation, Co-CreationBureau, Osaka University
- Japan Society for the Promotion of Science KAKENHI [18H05212]
- Japan Society for the Promotion of Science [A17J049490]
- Innovation Bridge grant, Osaka University
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We propose a simple method for sensitive magneto-optic spectroscopy in the terahertz (THz) frequency regime without the need for detecting two orthogonally polarized field components. This simple method is based on the time-domain reflection spectroscopy and employs a single circular polarization state for probing free carriers under a magnetic field that is modulated by a rotating disk with permanent magnets. The evaluated modulation signal directly reflects the FaradayKerr ellipticity and optical rotation, which are sensitive to the characteristics of free carriers in semiconductors. We present results of the magneto-optic Kerr spectroscopy on n- and p-Ge substrates with different carrier concentrations and InSb. The experimental results indicate larger Kerr ellipticity and optical rotation near the plasma frequency. Due to the Faraday effect, we also observe an enhanced modulation signal of the THz pulse reflected from the backside surface of the low-carrier-concentration sample. Numerical simulations based on a simple free-carrier model reproduce our experimental results well. Our demonstration will help to advance multipurpose characterization techniques for various semiconductors.
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