Terahertz spectroscopy in pulsed laser deposited LaCa0.7Mn0.3O3/MgO thin films

F. Gao; J. Chen; S. X. Dou; X. C. Zhang

doi:10.1117/12.757959

4 January 2008 Terahertz spectroscopy in pulsed laser deposited LaCa_0.7Mn_0.3O₃/MgO thin films

F. Gao, J. Chen, S. X. Dou, X. C. Zhang

Proceedings Volume 6840, Terahertz Photonics; 68401I (2008) https://doi.org/10.1117/12.757959
Event: Photonics Asia 2007, 2007, Beijing, China

Abstract

The electrical and magnetic properties of perovskite structures have great scientific interest. In this report we present a spectroscopy study of LaCa_0.7Mn_0.3O₃/MgO thin film to determine its optical properties. Terahertz time-domain measurements were performed to obtain THz transmission and emission spectra. The LaCa_0.7Mn_0.3O₃/MgO thin film used in this work was grow on single crystal substrate MgO (100) by pulsed laser deposition (PLD) technique and the transport measurement has shown that the thin is a colossal magnetoresistance (CMR) material. The insulator to metal transition temperature, T_IM is about 150K according to the temperature dependence of the resistivity measurement. On the THz transmission measurement, the spectra of the MgO and the thin film were taken in both air and N₂ to determine the effect of water absorption. In the emission measurement, the femto-second laser is incident on either the LaCa_0.7Mn_0.3O₃/MgO thin film or on the InAs wafer. The emitted THz signals in both cases were obtained and compared.

Citation Download Citation

F. Gao, J. Chen, S. X. Dou, and X. C. Zhang "Terahertz spectroscopy in pulsed laser deposited LaCa_0.7Mn_0.3O₃/MgO thin films", Proc. SPIE 6840, Terahertz Photonics, 68401I (4 January 2008); https://doi.org/10.1117/12.757959

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