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MATCHING STRUCTURES WITH FORM BIREFRINGENCE WITH FREE SPACE IN THZ RANGE

heading: 
MICROWAVE AND TERAHERTZ TECHNOLOGY
Bezborodov, VI, Kosiak, OS, Kuleshov, YM, Yachin, VV
Organization: 

O. Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine
12, Proskura st., Kharkov, 61085, Ukraine
E-mail: oleg.kosiak@gmail.com

Institute of Radio Astronomy of the National Academy of Sciences of Ukraine
4, Chervonopraporna St., Kharkov, 61002, Ukraine
E-mail: yachin@rian.kharkov.ua
https://doi.org/10.15407/rej2015.02.083
Language: russian
Abstract: 

When constructing polarization radio measuring paths operating in the THz frequency range (0.1…10 THz) the differential phase sections (DPS) are widely used. The use of terahertz waves (THz) allows research in radio astronomy, radio spectroscopy, biology, medicine, physics of the atmosphere, etc. Due to the fact that in a terahertz wave range quasi-optical transmission lines are used the transfer to the optical principles of construction DPS using dielectrics having birefringence property, in particular, form birefringence seems to be very attractive. One of the important requirements when creating the DPS is their matching with free space. The paper represents the ways of matching structures with form birefringence in the form of a multilayer stack of alternating dielectric plates with different dielectric constants. Such an antireflection layer may be formed when one of the plates is projected over the surface of the birefringent dielectric structure. In the first case projecting plates have transverse grooves. In the second case plates are formed without grooves. For the calculation of such structures we used a numerical method of integral functionals in the frequency domain for full wave dispersion problem of plane monochromatic wave scattering from a lattice consisting of dielectric bars without loss. An experimental study of models of structures, which confirmed the possibility of matching with the methods discussed in the THz range was made.
Keywords: differential phase section, form birefringence, matching, quasioptics, terahertz range

Manuscript submitted  24.03.2015
Radiofiz. elektron. 2015, 20(2): 83-89
Full text  (PDF)

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