Abstract
Lithium niobate (LiNbO3) is a well known uniaxial ferroelectric material. Using impedance measurement, quasi-optical free-space characterization, THz time domain spectroscopy (THz–TDS) and ellipsometry, its dielectric permittivity/refractive index was characterized depending on the crystal orientation over a broad frequency range: 1 mHz to 1 PHz ( nm). Three different frequency ranges, separated by well identified resonances, are observed: low frequency ‘free-piezoelectric’ response, intermediate frequency ‘clamped-ionic’ response and high frequency ‘electronic’ response. These features are discussed with an emphasis on the role of the crystallographic structure and piezoelectric response.
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