@article{8204,
  author = {C. Cochard and T. Spielmann and N. Bahlawane and A. Halpin and T. Granzow},
  title = {Broadband characterization of congruent lithium niobate from mHz to optical frequencies},
  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 (lambda = 300 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.},
  year = {2017},
  journal = {Journal of Physics D: Applied Physics},
  volume = {50},
  pages = {36LT01},
  doi = {10.1088/1361-6463/aa80b8},
  language = {eng},
}