Time-Domain Terahertz Spectroscopy of (100) (LaAlO3)0.3-(Sr2AlTaO6)0.7 Substrate

Toshihiko Kiwa, Masayoshi Tonouchi

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We measured terahertz (THz) properties of high-Tc superconductor’s (HTS’s) substrates, (100) MgO and (100) (LaAlO3)0.3-(Sr2AlTaO6)0.7 (LSAT), at frequencies between 0.5 THz and 2 THz using time-domain terahertz spectroscopy (TDTS). The complex refractive index \tilde{n} and dielectric function \tildeɛ of the MgO substrate were independent of frequencies; those of LSAT slightly increased with increasing frequency. It was determined that \tilde{n}=3.17+i0.004 and \tildeɛ=10.1+i0.06 for the MgO substrate and \tilde{n}=4.8+i0.02 and \tildeɛ=24+i0.2 for the LSAT substrate at 1 THz. The LSAT values were almost independent of the temperature at these frequencies. The dielectric loss \tan δ’s of the LSAT and the MgO substrates were less than 0.01. The \tan δ’s of LSAT were several times larger than those of MgO, and increased with an increase of frequency.
Original languageEnglish
Pages (from-to)38
JournalJapanese Journal of Applied Physics
Publication statusPublished - Jan 1 2001

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