Optical properties of lead germanate Pb5Ge3On in terahertz range

5th International Conference of Photonics and Information Optics

Vlasov, M. Yu^1,2 ; Losev, V.F.^3 ; Nikolaev, N.A.^1,3 ; Mamrashev, A.A.^1,3

Institute of Automation and Electrometry SB RAS, 1 Ac. Koptyuga av., Novosibirsk

630090, Russia^1

Novosibirsk State University, 2 Pirogova str., Novosibirsk

630090, Russia^2

Institute of High Current Electronics, 2/3 Academichesky av., Tomsk

634055, Russia^3

关键词: Complex dielectric permittivities;    High birefringence;    Imaginary parts;    Lead germanate;    Lorentz oscillator;    Polarizing filter;    Terahertz range;    Terahertz time domain spectroscopy;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/737/1/012022/pdf
DOI  :  10.1088/1742-6596/737/1/012022

来源: IOP

【 摘 要 】

We measured ordinary and extraordinary refractive index and absorption of ferroelectric lead germanate in the range of 0.1 - 1.3 THz by the method of terahertz time- domain spectroscopy. We studied soft mode behaviour with the rise of temperature by fitting imaginary part of the complex dielectric permittivity with three Lorentz oscillators. We found that high birefringence and dichroism of lead germanate or its analogues can be used for manufacturing of effective terahertz polarizing filters.