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

Unferdorben, MĂĄrta

BuzĂĄdy, Andrea

Hebling, JĂĄnos

Kiss, KrisztiĂĄn

Hajdara, Ivett

KovĂĄcs, LĂĄszlĂł

PÊter, Ágnes

PĂĄlfalvi, LĂĄszlĂł

Springer

2016-03-02

QC02 Optics / fĂŠnytan

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.

angol

Article

PeerReviewed

info:eu-repo/semantics/article

text

http://real.mtak.hu/48509/1/04%20JIMTW-37-703%20-%20Paratel...

Unferdorben, Mårta and Buzådy, Andrea and Hebling, Jånos and Kiss, Krisztiån and Hajdara, Ivett and Kovåcs, Låszló and PÊter, Ágnes and Pålfalvi, Låszló (2016) Index of Refraction and Absorption Coefficient Spectra of Paratellurite in the Terahertz Region. Journal of Infrared, Millimeter and Terahertz Waves, 37 (7). pp. 703-709. ISSN 1866-6892, ESSN: 1866-6906

http://real.mtak.hu/48509/

http://dx.doi.org/10.1007/s10762-016-0261-1

DOI 10.1007/s10762-016-0261-1