Observation of the Three-Dimensional Polarization Vector in Films of Organic Molecular Ferroelectrics Using Terahertz Radiation Emission

Yuto Kinoshita, Masato Sotome, Tatsuya Miyamoto, Yohei Uemura, Shunto Arai, Sachio Horiuchi, Tatsuo Hasegawa, Hiroshi Okamoto, and Noriaki Kida
Phys. Rev. Applied 14, 054002 – Published 2 November 2020

Abstract

For the application of a ferroelectric thin film to optical and electric devices, it is important to align its ferroelectric polarization parallel or perpendicular to the film surface. In this context, an effective method to characterize the polarization directions in the whole area of devices is needed. Here, we report an alternative method to determine a polarization vector in three dimensions using an emission of terahertz waves. The target material is an organic hydrogen-bonded molecular ferroelectric 2-methylbenzimidazole (MBI). By the irradiation of a femtosecond laser pulse on a bulk single-crystal thin film of MBI, we observe the emission of the terahertz waves originating from the polarization modulation of infrared-active phonons via the impulsive stimulated Raman-scattering mechanism. By measuring the terahertz electric field parallel to the ferroelectric polarization with rotating the single-crystal film around two independent axes, we succeed in determining the polarization vector in three dimensions, the direction of which is tilted by 45° normal to the film surface and substrate. This method can be a powerful tool to characterize directions of ferroelectric polarizations in any kinds of thin-film samples.

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  • Received 15 May 2020
  • Revised 3 September 2020
  • Accepted 30 September 2020

DOI:https://doi.org/10.1103/PhysRevApplied.14.054002

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yuto Kinoshita1, Masato Sotome1, Tatsuya Miyamoto1, Yohei Uemura2, Shunto Arai2, Sachio Horiuchi3, Tatsuo Hasegawa2, Hiroshi Okamoto1,4, and Noriaki Kida1,*

  • 1Department of Advanced Materials Science, The University of Tokyo, 5-1-5 Kashiwa-no-ha, Chiba 277-8561, Japan
  • 2Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan
  • 3Research Institute for Advanced Electronics and Photonics (RIAEP), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan
  • 4AIST-UTokyo Advanced Operando-Measurement Technology Open Innovation Laboratory (OPERAND-OIL), National Institute of Advanced Industrial Science and Technology (AIST), Chiba 277-8568, Japan

  • *kida@edu.k.u-tokyo.ac.jp

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Vol. 14, Iss. 5 — November 2020

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