Time-Domain Terahertz Spectroscopy of (100) (LaAIO_3)_<0.3>-(Sr_2AITaO_6)_<0.7> Substrate : Optics and Queantum Electronics

概要

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We measured terahertz (THz) properties of high-T_c superconductor's (HTS'S) substrates, (100) MgO and (100) (LaAlO_3)_<0.3>(Sr_2AlTaO_6)_<0.7> (LSAT), at frequencies between 0.5 THz and 2 THz using time-domain terahertz spectroscopy (TDTS). The complex refractive index n^^- and dielectric functionnε^^- of the MgO substrate were independent of frequencies; those of LSAT slightly increased with increasing frequency. It was determined that n^^- = 3.17 + i0.004 and ε^^- = 10.1 + i0.06 for the MgO substrate and n^^- = 4.8 + i0.02 and ε^^- = 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.
社団法人応用物理学会の論文
2001-01-15