Terahertz birefringence of ZnO

Author

Kim, Youngchan ; Ahn, Jaewook ; Yee, Dae-Su

Author_Institution

Korea Res. Inst. of Stand. & Sci., Daejeon, South Korea

fYear

2009

fDate

21-25 Sept. 2009

Firstpage

1

Lastpage

2

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ICIMW.2009.5324942

Filename

5324942