Index of Refraction and Absorption Coefficient Spectra of Paratellurite in the Terahertz Region

Márta Unferdorben, Andrea Buzády, J. Hebling, Krisztián Kiss, Ivett Hajdara, L. Kovács, A. Péter, L. Pálfalvi

Research output: Contribution to journalArticle

6 Citations (Scopus)


Index of refraction and absorption coefficient spectra of pure paratellurite (α-TeO2) crystal as a potential material for terahertz (THz) applications were determined in the 0.25–2 THz frequency range at room temperature by THz time domain spectroscopy (THz-TDS). The investigation was performed with beam polarization both parallel (extraordinary polarization) and perpendicular (ordinary polarization) to the optical axis [001] of the crystal. Similarly to the visible spectral range, positive birefringence was observed in the THz range as well. It was shown that the values of the refractive index for extraordinary polarization are higher and show significantly larger dispersion than for the ordinary one. The absorption coefficient values are also larger for extraordinary polarization. The measured values were fitted by theoretical curves derived from the complex dielectric function containing independent terms of Lorentz oscillators due to phonon-polariton resonances. The results are compared with earlier publications, and the observed significant discrepancies are discussed.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalJournal of Infrared, Millimeter, and Terahertz Waves
Publication statusAccepted/In press - Mar 2 2016


  • Absorption coefficient
  • Paratellurite
  • Refractive index
  • Terahertz frequency range
  • Time domain terahertz spectroscopy

ASJC Scopus subject areas

  • Instrumentation
  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Radiation

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