Nonlinear Optical Properties in an Epitaxial YbFe2O4 Film Probed by Second Harmonic and Terahertz Generation

An epitaxial film of YbFe2O4, a candidate for oxide electronic ferroelectrics, was fabricated on yttrium-stabilized zirconia (YSZ) substrate by magnetron sputtering technique. For the film, second harmonic generation (SHG), and a terahertz radiation signal were observed at room temperature, confirmi...

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Bibliographic Details
Published in:Materials 2023-02, Vol.16 (5), p.1989
Main Authors: Yu, Hongwu, Okimoto, Yoichi, Morita, Atsuya, Shimanuki, Shuhei, Takubo, Kou, Ishikawa, Tadahiko, Koshihara, Shin-ya, Minakami, Ryusei, Itoh, Hirotake, Iwai, Shinichiro, Ikeda, Naoshi, Sakagami, Takumi, Nozaki, Mayu, Fujii, Tatsuo
Format: Article
Language:English
Subjects:
Electric fields
Ferroelectric materials
Ferroelectricity
Ferroelectrics
Information storage
Magnetron sputtering
Nonlinear optics
Optical properties
Polarization
Room temperature
Second harmonic generation
Single crystals
Substrates
Symmetry
Tensors
Terahertz frequencies
Thin films
Yttria-stabilized zirconia
Yttrium
Zirconium dioxide
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Summary:An epitaxial film of YbFe2O4, a candidate for oxide electronic ferroelectrics, was fabricated on yttrium-stabilized zirconia (YSZ) substrate by magnetron sputtering technique. For the film, second harmonic generation (SHG), and a terahertz radiation signal were observed at room temperature, confirming a polar structure of the film. The azimuth angle dependence of SHG shows four leaves-like profiles and is almost identical to that in a bulk single crystal. Based on tensor analyses of the SHG profiles, we could reveal the polarization structure and the relationship between the film structure of YbFe2O4 and the crystal axes of the YSZ substrate. The observed terahertz pulse showed anisotropic polarization dependence consistent with the SHG measurement, and the intensity of the emitted terahertz pulse reached about 9.2% of that emitted from ZnTe, a typical nonlinear crystal, implying that YbFe2O4 can be applied as a terahertz wave generator in which the direction of the electric field can be easily switched.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma16051989