Dynamic tuning of dielectric permittivity in BaTiO3 via electrical biasing. Issue 9 (1st September 2020)

• Record Type: Journal Article
• Authors: Misra, Shikhar; Kalaswad, Matias; Zhang, Di; Wang, Haiyan
• Is Part Of: Materials research letters. Volume 8:Issue 9(2020)
• Page Start: 321
• Page End: 327
• Publication Date: 2020-09-01
• Subjects: Biased ellipsometer -- tunable permittivity -- barium titanate -- ferroelectric -- epitaxial thin films; Materials science -- Research -- Periodicals; Biomedical materials -- Research -- Periodicals; Composite materials -- Research -- Periodicals; Biomedical materials -- Research; Composite materials -- Research; Materials science -- Research; Periodicals; 620.1105
• DOI: 10.1080/21663831.2020.1757527
• Languages: English
• ISSNs: 2166-3831

Abstract

ABSTRACT: Dynamic tuning of optical properties is technologically important for the development of future integrated electronic and photonic devices. Here, we demonstrate the electrically tunable permittivity in optical frequency in epitaxial BaTiO3 (BTO) thin films using spectroscopic ellipsometer measurements under DC bias condition. The lattice tetragonal distortion and domain switching of biased BTO is evident based on the increased anisotropy in permittivity in-plane and out-of-plane. Specifically, out-of-plane permittivity, arising from the c- domains, shows a continuous decrease with the applied voltage, relative to the in-plane permittivity, arising from the a- domains. The dielectric constant can also be reversibly adjusted through electric-reset cycles. GRAPHICAL ABSTRACT: IMPACT STATEMENT: The current study demonstrates the real-time electrically tunable dielectric permittivity in BaTiO3, probed using spectroscopic ellipsometer at optical frequencies, towards future tunable waveguides, optical components and devices.