Title :
Terahertz birefringence of ZnO
Author :
Kim, Youngchan ; Ahn, Jaewook ; Yee, Dae-Su
Author_Institution :
Korea Res. Inst. of Stand. & Sci., Daejeon, South Korea
Abstract :
Terahertz birefringence of zinc oxide is investigated using terahertz time-domain spectroscopy. Birefringence is observed in the <10-10> orientation while not in the <0001> orientation. Dispersion of ordinary and extraordinary refractive indices are measured, and the refractive index difference is found to be -0.18 in the 0.25 ~ 1.35 THz frequency region. It is demonstrated through azimuthal angle dependent transmission measurements that a 2-mm-thick ZnO crystal gives half-wave phase retardation at 0.42 and 1.24 THz. This study shows that ZnO is a candidate material for THz waveplates.
Keywords :
II-VI semiconductors; birefringence; refractive index; terahertz wave spectra; wide band gap semiconductors; zinc compounds; ZnO; extraordinary refractive indices; frequency 0.42 THz; frequency 1.24 THz; half-wave phase retardation; ordinary refractive indices; refractive index; size 2 mm; terahertz birefringence; terahertz time-domain spectroscopy; terahertz waveplates; Azimuthal angle; Birefringence; Dispersion; Frequency measurement; Goniometers; Phase measurement; Refractive index; Spectroscopy; Time domain analysis; Zinc oxide;
Conference_Titel :
Infrared, Millimeter, and Terahertz Waves, 2009. IRMMW-THz 2009. 34th International Conference on
Conference_Location :
Busan
Print_ISBN :
978-1-4244-5416-7
Electronic_ISBN :
978-1-4244-5417-4
DOI :
10.1109/ICIMW.2009.5324942
